Physicists from the United Kingdom

"Radioactivity is shown to be accompanied by chemical changes in which new types of matter are being continually produced. … The conclusion is drawn that these chemical changes must be sub-atomic in character."

"We may in these processes obtain very great quantities of energy, but on the average we cannot hope to obtain energy for practical use in this way. The bombardment of the atom is a very poor and inefficient way of producing energy and anyone who is looking for a source of cheap power in the transformation of the atom, is talking pure moonshine... Some day the knowledge we may gain may be of practical value, but there is no indication of it yet."

"It is just as surprising as if a gunner fired a shell at a single sheet of paper and for some reason or other the projectile bounded back again."

"It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you."

"It is not in the nature of things for any one man to make a sudden violent discovery; science goes step by step, and every man depends on the work of his predecessors. When you hear of a sudden unexpected discovery—a bolt from the blue, as it were—you can always be sure that it has grown up by the influence of one man on another, and it is this mutual influence which makes the enormous possibility of scientific advance. Scientists are not dependent on the ideas of a single man, but on the combined wisdom of thousands of men, all thinking of the same problem, and each doing his little bit to add to the great structure of knowledge which is gradually being erected."

"All science is either physics or stamp collecting."

"That which is not measurable is not science. — also attributed to Lord Kelvin"

"Don't let me catch anyone talking about the Universe in my department."

"An alleged scientific discovery has no merit unless it can be explained to a barmaid."

"I know what the atom looks like!"

"When we have found how the nucleus of atoms is built up we shall have found the greatest secret of all — except life. We shall have found the basis of everything — of the earth we walk on, of the air we breathe, of the sunshine, of our physical body itself, of everything in the world, however great or however small — except life."

"I came into the room which was half-dark and presently spotted Lord Kelvin in the audience, and realised that I was in for trouble at the last part of my speech dealing with the age of the Earth, where my views conflicted with his. To my relief, Kelvin fell fast asleep, but as I came to the important point, I saw the old bird sit up, open an eye and cock a baleful glance at me. Then a sudden inspiration came, and I said Lord Kelvin had limited the age of the Earth, provided no new source [of heat] was discovered. That prophetic utterance referred to what we are now considering tonight, radium! Behold! The old boy beamed upon me."

"I must confess it was very unexpected and I am very startled at my metamorphosis into a chemist."

"We're like children who always want to take apart watches to see how they work."

"We've got no money, so we've got to think."

"...Rutherford never spent more than £2500 a year on his research programme. He resisted suggestions that an industrial appeal might provide him with more money and he did not believe in the economic significance of any of the work he was doing. He used to boast that ‘we have no money, so we shall have to think’."

"If your experiment needs statistics, you ought to have done a better experiment."

"I have broken the machine and touched the ghost of matter."

"The first point that arises is the atom. I was brought up to look at the atom as a nice hard fellow, red or grey in colour, according to taste. In order to explain the facts, however, the atom cannot be regarded as a sphere of material, but rather as a sort of wave motion of a peculiar kind. The theory of wave-mechanics, however bizarre it may appear... has the astonishing virtue that it works, and works in detail, so that it is now possible to understand and explain things which looked almost impossible in earlier days. One of the problems encountered is the relation between the electron, an atom and the radiation produced by them jointly; the new mechanics states the type of radiation emitted with correct numerical relations. When applied to the periodic table, a competent and laborious mathematician can predict the periodic law from first principles."

"Rutherford's attitude to his own discoveries is illustrated by his response to a remark of one who was present at the moment of one of his great discoveries: "Rutherford, you are always on the crest of the wave." To which Rutherford responded: "I made the wave, didn't I?" Somehow from Rutherford's vantage point everything he said seems right, even including his remark, "I do not let my boys waste their time" when he was asked if he encouraged his students to study relativity! Rutherford was a happy warrior if ever there was one."

"In 2005, we had a couple of things going for us. First, of course, we knew how the experiment was supposed to come out. They had been out there in the blue. We also had faster, stronger, and more reliable equipment to pull vacuums, greatly reducing the results contaminated by the odd air molecule or hydrogen atom. But we, and the world, now know the deadly dangers of radioactivity. Rutherford used to toss bits of radioactive material in his pocket and then, before dinner, into the top drawer of his desk at home. ...If we tried to use what they used, we couldn't all be in this room... We couldn't be in the building."

"Rutherford's discovery was the beginning of the science that came to be called nuclear physics. ...The projectiles that he used to explore the nucleus were particles produced in the disintegration of radium... discovered by Marie Curie in 1898. The particles are helium nuclei that are emitted at high speed when radium atoms decay...The twenty years between 1909 and 1929 were the era of tabletop nuclear physics. ...Small and simple experiments were sufficient to establish the basic laws of nuclear physics."

"The switch from natural sources of particles to accelerators would start a new era in the history of science, the era of accelerator physics. ...The two men who actually built the first accelerator were John Cockcroft and Ernest Walton, graduate students working... under the supervision of Rutherford. ...For five years they struggled to create a technology of big machines in a laboratory of tabletop experiments, just as the Wright brothers had struggled to create a technology of flying machines in a bicycle shop ....In April of 1932, they had a machine that produced a steady stream of hydrogen nuclei with an energy of about half a million volts. ...Walton was... ready to do the experiment... to bombard a target made of the light metal lithium. The result was spectacular. The lithium nuclei were split in two and fell apart into pairs of helium nuclei. The helium nuclei came out with thirty times as much energy as the hydrogen nuclei going in. ...Rutherford happily spent the rest of the day serving as Walton's assistant... That day, the era of tabletop nuclear physics ended and the era of big machines and big projects began."

"He died a year before the discovery of the fission of the uranium nucleus in Berlin in 1938, the discovery which turned nuclear physics into a big industry and a weapon of war."

"Rutherford did not pretend to understand quantum mechanics, but he understood that the Gamow formula would give his accelerator a crucial advantage. Even particles accelerated at much lower energies... would be able to penetrate into nuclei. Rutherford invited Gamow to Cambridge in January 1929... [They] became firm friends and Gamow's insight gave Rutherford the impetus to go full steam ahead with the building of his accelerator."

"One can hardly speak of being friendly with a force of nature."

"He seemed bored with his radio work. ...he had transmitted signals more than half a mile through Cambridge's stone builidings, and there was great interest in finding a way to use such signals in ship-to-shore communications... Some scientists, astonished at those demonstrations, believed that Rutherford's work in New Zealand and then at the Cavendish was actually ahead of the work being done by Guglielmo Marconi..."

"A computation is a physical process in which physical objects like computers, or slide rules or brains are used to discover, or to demonstrate or to harness properties of abstract objects—like numbers and equations. How can they do that? The answer is that we use them only in situations where to the best of our understanding the laws of physics will cause physical variables like electric currents in computers (representing bits) faithfully to mimic the abstract entities that we’re interested in."

"Surely it is more interesting to argue about what the truth is, than about what some particular thinker, however great, did or did not think."

"Our best theories are not only truer than common sense, they make more sense than common sense..."

"The truly privileged theories are not the ones referring to any particular scale of size or complexity, nor the ones situated at any particular level of the predictive hierarchy—but the ones that contain the deepest explanations."

"The overwhelming majority of theories are rejected because they contain bad explanations, not because they fail experimental tests."

"A prediction, or any assertion, that cannot be defended might still be true, but an explanation that cannot be defended is not an explanation."

"To say that prediction is the purpose of a scientific theory is to confuse means with ends. It is like saying that the purpose of a spaceship is to burn fuel. … Passing experimental tests is only one of many things a theory has to do to achieve the real purpose of science, which is to explain the world."

"The quantum theory of parallel universes is not the problem, it is the solution. It is not some troublesome, optional interpretation emerging from arcane theoretical considerations. It is the explanation—the only one that is tenable—of a remarkable and counter-intuitive reality."

"Reality contains not only evidence, but also the means (such as our minds, and our artefacts) of understanding it. There are mathematical symbols in physical reality. The fact that it is we who put them there does not make them any less physical."

"Thus we can see that if we take solipsism seriously - if we assume that it is true and that all valid explanations must scrupulously conform to it - it self destructs. How exactly does solipsism, taken seriously, differ from its common-sense rival, realism? The difference is based on no more than a renaming scheme. Solipsism insists on referring to objectively different things (such as external reality and my unconscious mind, or introspection and scientific observation) by the same names. But then it has to introduce the distinction through explanations in terms of something like the 'outer part of myself'. But no such extra explanation would be necessary without its insistence on an inexplicable renaming scheme. Solipsism must also postulate the existence of an additional class of processes - invisible, inexplicable processes which give the mind the illusion of living in an external reality. The solipsist, who believes that nothing exists other than the contents of one mind, must also believe that that mind is a phenomenon of greater multiplicity than is normal supposed. It contains other-people-like thoughts, planet-like thoughts and laws-of-physics-like thoughts. These thoughts are real. They develop in a complex way (or pretend to), and they have enough autonomy to surprise, disappoint, enlighten or thwart other classes of thoughts which call themselves 'I'. Thus the solipsist's explanation of the world is in terms of interacting thoughts rather than interacting objects. But those thoughts are real, and interact according to the same rules that the realist says govern the interaction of objects. Thus solipsism, far from being a world view striped to its essentials, is actually just realism disguised and weighed down by additional baggage, introduced only to be explained away."

"Think of all our knowledge-generating processes, our whole culture and civilization, and all the thought processes in the minds of every individual, and indeed the entire evolving biosphere as well, as being a gigantic computation. The whole thing is executing a self-motivated, self-generating computer program. More specifically it is, as I have mentioned, a virtual-reality program in the process of rendering, with ever-increasing accuracy, the whole of existence."

"It is possible to build a virtual-reality generator whose repertoire includes every possible environment."

"Since building a universal virtual-reality generator is physically possible, it must actually be built in some universes."

"Quantum computation is … nothing less than a distinctly new way of harnessing nature … It will be the first technology that allows useful tasks to be performed in collaboration between parallel universes, and then sharing the results."

"The next chapter is likely to provoke many mathematicians. This can't be helped. Mathematics is not what they think it is."

"Mathematical knowledge may, just like our scientific knowledge, be deep and broad, it may be subtle and wonderfully explanatory, it may be uncontroversially accepted; but it cannot be certain."

"Necessary truth is merely the subject-matter of mathematics, not the reward we get for doing mathematics. The object of mathematics is not, and cannot be, mathematical certainty. It is not even mathematical truth, certain or otherwise. It is, and must be, mathematical explanation."

"Time travel may be achieved one day, or it may not. But if it is, it should not require any fundamental change in world-view, at least for those who broadly share the world view I am presenting in this book."

"Kuhn's theory suffers from a fatal flaw. It explains the succession from one paradigm to another in sociological or psychological terms, rather than as having primarily to do with the objective merit of the rival explanations. Yet unless one understands science as a quest for explanations, the fact that it does find successive explanations, each objectively better than the last, is inexplicable."

"Experience is indeed essential to science, but its role is different from that supposed by empiricism. It is not the source from which theories are derived. Its main use is to choose between theories that have already been guessed. That is what ‘learning from experience’ is."

"The misconception that knowledge needs authority to be genuine or reliable dates back to antiquity, and it still prevails. To this day, most courses in the philosophy of knowledge teach that knowledge is some form of justified, true belief, where ‘justified’ means designated as true (or at least ‘probable’) by reference to some authoritative source or touchstone of knowledge."

"That progress is both possible and desirable is perhaps the quintessential idea of the Enlightenment. It motivates all traditions of criticism, as well as the principle of seeking good explanations. But it can be interpreted in two almost opposite ways, both of which, confusingly, are known as ‘perfectibility’. One is that humans, or human societies, are capable of attaining a state of supposed perfection – such as the Buddhist or Hindu ‘nirvana’, or various political utopias. The other is that every attainable state can be indefinitely improved. Fallibilism rules out that first position in favour of the second."

"Any theory about improvement raises the question: how is the knowledge of how to make that improvement created? Was it already present at the outset? The theory that it was is creationism. Did it ‘just happen’? The theory that it did is spontaneous generation."

"If something is permitted by the laws of physics, then the only thing that can prevent it from being technologically possible is not knowing how."

"Let me define that [wealth] in a non-parochial way as the repertoire of physical transformations that they would be capable of causing."

"Could it be that the moral imperative not to destroy the means of correcting mistakes is the only moral imperative? That all other moral truths follow from it?"

"As I understand it, the claim is that the less you use Homeopathy, the better it works. Sounds plausible to me."

"The rational thing for a layperson to do is to take seriously the prevailing scientific theory."

"Native slipstream thinking, which has been around for millennia, anticipated recent cutting-edge physics, ironically suggesting that Natives have had things right all along. The closest approximation in quantum mechanics is the concept of the "multiverse," which posits that reality consists of a number of simultaneously existing alternate worlds and/or parallel worlds. Interested readers will enjoy John Gribbin's In Search of the Multiverse: Parallel Worlds, Hidden Dimensions, and the Quest for the Frontiers of Reality (2010) and David Deutsch's seminal The Fabric of Reality: The Science of Parallel Universes and Its Implications (1998). Deutsch's approach describes reality as "an infinite library full of copies of books that all start out the same way on page one, but in which the story in each book deviates more and more from the versions in the other books the farther into the book you read." The further twist of Deutsch's theory is that it "allows universes to merge back together... as if two of the books in the library have the same happy ending arrived at by different routes.""

"I think it is a sad reflection on our civilisation that while we can and do measure the temperature in the atmosphere of Venus, we do not know what goes on inside our souffles."

"There is no reason why an extraphysical general principle is necessarily to be avoided, since such principles could conceivably serve as useful working hypotheses. For the history of scientific research is full of examples in which it was very fruitful indeed to assume that certain objects or elements might be real, long before any procedures were known which would permit them to be observed directly."

"Of course, we must avoid postulating a new element for each new phenomenon. But an equally serious mistake is to admit into the theory only those elements which can now be observed. For the purpose of a theory is not only to correlate the results of observations that we already know how to make, but also to suggest the need for new kinds of observations and to predict their results. In fact, the better a theory is able to suggest the need for new kinds of observations and to predict their results correctly, the more confidence we have that this theory is likely to be good representation of the actual properties of matter and not simply an empirical system especially chosen in such a way as to correlate a group of already known facts."

"We have reversed the usual classical notion that the independent "elementary parts" of the world are the fundamental reality, and that the various systems are merely particular contingent forms and arrangements of these parts. Rather, we say that inseparable quantum interconnectedness of the whole universe is the fundamental reality, and that relatively independent behaving parts are merely particular and contingent forms within this whole."

"The weekend began with the expectation that there would be a series of lectures and informative discussions with emphasis on content. It gradually emerged that something more important was actually involved — the awakening of the process of dialogue itself as a free flow of meaning among all the participants. In the beginning, people were expressing fixed positions, which they were tending to defend, but later it became clear that to maintain the feeling of friendship in the group was much more important than to hold any position. Such friendship has an impersonal quality in the sense that its establishment does not depend on a close personal relationship between participants. A new kind of mind thus begins to come into being which is based on the development of a common meaning that is constantly transforming in the process of the dialogue. People are no longer primarily in opposition, nor can they be said to be interacting, rather they are participating in this pool of common meaning which is capable of constant development and change. In this development the group has no pre-established purpose, though at each moment a purpose that is free to change may reveal itself. The group thus begins to engage in a new dynamic relationship in which no speaker is excluded, and in which no particular content is excluded. Thus far we have only begun to explore the possibilities of dialogue in the sense indicated here, but going further along these lines would open up the possibility of transforming not only the relationship between people, but even more, the very nature of consciousness in which these relationships arise."

"The point about dialectic is the ultimate identity of the universal and the individual. The individual is universal and the universal is the individual. The word "individual" means undivided, so we could say that very few individuals have ever existed. We could call them dividuals. Individuality is only possible if it unfolds from wholeness. ... Ego-centeredness is not individuality at all."

"Deep down the consciousness of mankind is one. This is a virtual certainty because even in the vacuum matter is one; and if we don't see this, it's because we are blinding ourselves to it."

"Consciousness is much more of the implicate order than is matter . . . Yet at a deeper level [matter and consciousness] are actually inseparable and interwoven , just as in the computer game the player and the screen are united by participation."

"The ability to perceive or think differently is more important than the knowledge gained."

"During the past few decades, modern technology, with radio, TV, air travel, and satellites, has woven a network of communication which puts each part of the world in to almost instant contact with all the other parts. Yet, in spite of this world-wide system of linkages, there is, at this very moment, a general feeling that communication is breaking down everywhere, on an unparalleled scale..."

"Dialogue is really aimed at going into the whole thought process and changing the way the thought process occurs collectively. We haven't really paid much attention to thought as a process. we have engaged in thoughts, but we have only paid attention to the content, not to the process. Why does thought require attention? Every thinking requires attention, really. If we ran machines withinout paying attention to them, they would break down. Our thought, too, is a process, and it requires attention, otherwise its going to go wrong."

"We probed into the nature of space and time, and of the universal, both with regard to external nature and with regard to mind. But then, we went on to consider the general disorder and confusion that pervades the consciousness of mankind. It is here that I encountered what I feel to be Krishnamurti's major discovery. What he was seriously proposing is that all this disorder, which is the root cause of such widespread sorrow and misery, and which prevents human beings from properly working together, has its root in the fact that we are ignorant of the general nature of our own processes of thought. Or to put it differently it may be said that we do not see what is actually happening, when we are engaged in the activity of thinking."

"The field of the finite is all that we can see, hear, touch, remember, and describe. This field is basically that which is manifest, or tangible. The essential quality of the infinite, by contrast, is its subtlety, its intangibility. This quality is conveyed in the word spirit, whose root meaning is "wind, or breath." This suggests an invisible but pervasive energy, to which the manifest world of the finite responds. This energy, or spirit, infuses all living beings, and without it any organism must fall apart into its constituent elements. That which is truly alive in the living being is this energy of spirit, and this is never born and never dies."

"I would say that in my scientific and philosophical work, my main concern has been with understanding the nature of reality in general and of consciousness in particular as a coherent whole, which is never static or complete but which is an unending process of movement and unfoldment..."

"Then there is the further question of what is the relationship of thinking to reality. As careful attention shows, thought itself is in an actual process of movement. That is to say, one can feel a sense of flow in the stream of consciousness not dissimilar to the sense of flow in the movement of matter in general. May not thought itself thus be a part of reality as a whole? But then, what could it mean for one part of reality to 'know' another, and to what extent would this be possible?"

"Man's general way of thinking of the totality, i.e. his general world view, is crucial for overall order of the human mind itself. If he thinks of the totality as constituted of independent fragments, then that is how his mind will tend to operate, but if he can include everything coherently and harmoniously in an overall whole that is undivided, unbroken and without border (for every border is a division or break) then his mind will tend to move in a similar way, and from this will flow an orderly action within the whole."

"My suggestion is that at each state the proper order of operation of the mind requires an overall grasp of what is generally known, not only in formal logical, mathematical terms, but also intuitively, in images, feelings, poetic usage of language, etc. (Perhaps we could say that this is what is involved in harmony between the 'left brain' and the 'right brain'). This kind of overall way of thinking is not only a fertile source of new theoretical ideas: it is needed for the human mind to function in a generally harmonious way, which could in turn help to make possible an orderly and stable society."

"The quantum theory, as it is now constituted, presents us with a very great challenge, if we are at all interested in such a venture, for in quantum physics there is no consistent notion at all of what the reality may be that underlies the universal constitution and structure of matter. Thus, if we try to use the prevailing world view based on the notions of particles, we discover that the 'particles' (such as electrons) can also manifest as waves, that they move discontinuously, that there are no laws at all that apply in detail to the actual movements of individual particles and that only statistical predictions can be made about large aggregates of such particles. If on the other hand we apply the world view in which the world is regarded as a continuous field, we find that this field must also be discontinuous, as well as particle-like, and that it is as undermined in its actual behaviour as is required in the particle view of relation as a whole."

"In relativity, movement is continuous, causally determinate and well defined, while in quantum mechanics it is discontinuous, not causally determinate and not well defined. Each theory is committed to its own notions of essentially static and fragmentary modes of existence (relativity to that of separate events, connectable by signals, and quantum mechanics to a well-defined quantum state). One thus sees that a new kind of theory is needed which drops these basic commitments and at most recovers some essential features of the older theories as abstract forms derived from a deeper reality in which what prevails in unbroken wholeness."

"The notion that all these fragments are separately existent is evidently an illusion, and this illusion cannot do other than lead to endless conflict and confusion. Indeed, the attempt to live according to the notion that the fragments are really separate is, in essence, what has led to the growing series of extremely urgent crises that is confronting us today. Thus, as is now well known, this way of life has brought about pollution, destruction of the balance of nature, over-population, world-wide economic and political disorder and the creation of an overall environment that is neither physically nor mentally healthy for most of the people who live in it. Individually there has developed a widespread feeling of helplessness and despair, in the face of what seems to be an overwhelming mass of disparate social forces, going beyond the control and even the comprehension of the human beings who are caught up in it."

"In society, the basic carrier of meaning is culture, which is indeed just shared meaning."

"...if somebody sees a different meaning to society or to life, that will change society. Every revolution has come from somebody seeing a different meaning in human society."

"The power of meaning is that it completely organizes being."

"We have various ways of dealing with biological misinformation. The best way is by the immune system which recognizes it and gets rid of it, but we have no such system in society. Misinformation accumulates and society gradually decays. You see, the older the society gets, the more chance it has to accumulate all sorts of misinformation and the more it starts to fall a part. The society is blocked because misinformation is held rigidly."

"The fear of uncertainty is our basic trouble. Uncertainty is the very nature of meaning and the very nature of being, for meaning is always context-dependent. We do not know the context that might come, and this is why we can never be certain that our meanings will be correct and give us security. So if you cannot live with this fact of uncertainty, some distortion is taking place already."

"For both the rich and the poor, life is dominated by an ever growing current of problems, most of which seem to have no real and lasting solution. Clearly we have not touched the deeper causes of our troubles. It is the main point of this book that the ultimate source of all these problems is in thought itself, the very thing of which our civilization is most proud, and therefore the one thing that is "hidden" because of our failure seriously to engage with its actual working in our own individual lives and in the life of society."

"Suppose you have two religions. Thought defines religion — the thought about the nature of God and various questions like that. Such thought is very important because it is about God, who is supposed to be supreme. The thought about what is of supreme value must have the highest force. So if you disagree about that, the emotional impact can be very great, and you will then have no way to settle it. Two different beliefs about God will thus produce intense fragmentation — similarly with thoughts about the nature of society, which is also very important, or with ideologies such as communism and capitalism, or with different beliefs about your family or about your money. Whatever it is that is very important to you, fragmentation in your thought about it is going to be very powerful in its effects."

"Difference exist because thought develops like a stream that happens to go one way here and another way there. Once it develops it produces real physical results that people are looking at, but they don't see where these results are coming from — that's one of the basic features of fragmentation. When they have produced these divisions they see that real things have happened, so they'll start with these real things as if they just suddenly got there by themselves, or evolved in nature by themselves."

"We often find that we cannot easily give up the tendency to hold rigidly to patterns of thought built up over a long time. We are then caught up in what may be called absolute necessity. This kind of thought leaves no room at all intellectually for any other possibility, while emotionally and physically, it means we take a stance in our feelings, in our bodies, and indeed, in our whole culture, of holding back or resisting. This stance implies that under no circumstances whatsoever can we allow ourselves to give up certain things or change them."

"If I am right in saying that thought is the ultimate origin or source, it follows that if we don't do anything about thought, we won't get anywhere. We may momentarily relieve the population problem, the ecological problem, and so on, but they will come back in another way."

"Of course, one of the main legitimate functions of thought has always been to help provide security, guaranteeing shelter and food for instance. However, this function went wrong when the principal source of insecurity came to be the operation of thought itself."

"Culture is shared meaning. Suppose we were able to share meanings freely without a compulsive urge to impose our view or conform to those of others and without distortion and self-deception. Would this not constitute a real revolution in culture."

"What I mean by 'thought' is the whole thing — thought, 'felt', the body, the whole society sharing thoughts — it's all one process. It is essential for me not to break that up, because it's all one process; somebody else's thought becomes my thought, and vice versa. Therefore it would be wrong and misleading to break it up into my thought, your thought, my feelings, these feelings, those feelings. I would say that thought makes what is often called in modern language a system. A system means a set of connected things or parts. But the way people commonly use the word nowadays it means something all of whose parts are mutually interdependent — not only for their mutual action, but for their meaning and for their existence. A corporation is organized as a system — it has this department, that department, that department... they don't have any meaning separately; they only can function together. And also the body is a system. Society is a system in some sense. And so on. Similarly, thought is a system. That system not only includes thought and feelings, but it includes the state of the body; it includes the whole of society — as thought is passing back and forth between people in a process by which thought evolved from ancient times. Thought has been constantly evolving and we can't say when that system began. But with the growth of civilization it has developed a great deal. It was probably very simple thought before civilization, and now it has become very complex and ramified and has much more incoherence than before. Now, I say that this system has a fault in it — a 'systematic fault'. It is not a fault here, there or here, but it is a fault that is all throughout the system. Can you picture that? It is everywhere and nowhere. You may say I see a problem here, so I will bring my thoughts to bear on this problem". But "my" thought is part of the system. It has the same fault as the fault I'm trying to look at, or a similar fault. Thought is constantly creating problems that way and then trying to solve them. But as it tries to solve them it makes it worse because it doesn’t notice that it's creating them, and the more it thinks, the more problems it creates."

"We started out saying the trouble is that the world is in chaos, but I think we end up by saying that thought is in chaos. That's each one of us. And that is the cause of the world's being in chaos. Then the chaos of the world comes back and adds to the chaos of thought."

"...thought is a very subtle set of reflexes which is potentially unlimited; you can add more and more and you can modify your reflexes. Suppose like a logician you say: 'All swans are white. This bird is a wan therefore this bird is white.' But then you modify this by saying, 'I've seen that some swans may not be white.' And so on. Even the whole logical process, once it's committed to memory, becomes a set of reflexes. There may be a perception of reason beyond the reflexes, but anything perceived becomes sooner or later a set of reflexes. And what's what I want to call 'thought' – which includes the emotion, the bodily state, the physical reaction and everything else."

"One of the most powerful thoughts people have is the thought of necessity. It is much more than a thought. The word 'necessary' means 'it cannot be otherwise', and the Latin root means 'don't yield'. It suggests the emotional-physical stance of resisting, holding. That's the other side of the reflex system: when you say 'it cannot be otherwise', in effect your'e saying: 'It has got to be this way. I have to keep it this way'. You have a hold. Something that is necessary is a very powerful force which you can't turn aside. You may say 'I have to turn it aside.' Thus we establish an order of necessity, saying 'this turns aside for that, and this for that.'"

"…when an insight is put into words, what is it that puts it into words? Is it thought or is it the insight? I want to suggest that the insight itself will be an insight into the words which express it properly."

"...the attempt to deal with social problems by force is incoherent, because the problems all arise in thought. And violence will never solve the problem in thought."

"...if you have found the words which express the way you are actually thinking, the body will be affected."

"There's nothing more ephemeral than thoughts; and yet thoughts can hold themselves by saying 'I must remain this way forever, with absolute necessity.' The point is to have the notion of a creative being, rather than of an identified being."

"The perception of truth is an actual act which changes things; it’s not merely that it is the truth about something which is different."

"...we see a rainbow, but what we have is drops of rain and light – a process. Similarly, what we 'see' is a self; but what we actually have is a whole lot of thoughts going on in consciousness. Against the backdrop of consciousness, we are projecting a self, rather than a rainbow."

"We don't need the notion of an identity, of an all-important identity on to which we are going to hold, because that gets in the way of the need to change our reflexes. Once we identify with something, our reflexes are that way – it's very important, 'necessary'. And we will want to preserve that identity even thought it may involve ideas that are false."

"Communication can lead to the creation of something new only if people are able to freely listen to each other, without prejudice, and without trying to influence each other. Each has to be interested primarily in truth and coherence, so that he is ready to drop his old ideas and intentions, and be ready to go on to something different, when this is called for."

"Dialogue, as we are choosing to use the word, is a way of exploring the roots of the many crises that face humanity today. It enables inquiry into, and understanding of, the sorts of processes that fragment and interfere with real communication between individuals, nations, and even different parts of the same organization. In our modern culture men and women are able to interact with one another in many ways: they can sing, dance, or play together with little difficulty, but their ability to talk together about subjects that matter deeply to them seems invariably to lead to dispute, division, and often to violence. In our view this condition points to a deep and pervasive defect in the process of human thought."

"It is proposed that a form of free dialogue may well be one of the most effective ways of investigating the crisis which faces society, and indeed the whole of human nature and consciousness today. Moreover, it may turn out that such a form of free exchange of ideas and information is of fundamental relevance for transforming culture and freeing it of destructive misinformation, so that creativity can be liberated."

"A key difference between a dialogue and an ordinary discussion is that, within the latter people usually hold relatively fixed positions and argue in favor of their views as they try to convince others to change. At best this may produce agreement or compromise, but it does not give rise to anything creative."

"What is essential here is the presence of the spirit of dialogue, which is in short, the ability to hold many points of view in suspension, along with a primary interest in the creation of common meaning."

"In the early 1950s, [...] there were two important advances in the interpretation of quantum mechanics, both made by the American physicist David Bohm. Just as there were, it seems, two Bohrs, there were apparently two Bohms: a 1951 Bohm and a 1952 Bohm."

"I can tell you one thing. David Bohm knows a lot more than just a little about physics."

"Dave always arrives at the right conclusions, but his mathematics is terrible. I take it home and find all sorts of errors and then have to spend the night trying to develop the correct proof. But in the end, the result is always exactly the same as the one Dave saw directly."

"According to Bohm, the ground of the cosmos is not elementary particles but pure process, a flowing movement of the whole. Within this implicate order, Bohm believed, one could resolve the Cartesian split between mind and matter, or between brain and consciousness."

"The universe according to Bohm actually has two faces, or more precisely, two orders. One is the explicate order, corresponding to the physical world as we know it in day-to-day reality, the other a deeper, more fundamental order which Bohm calls the implicate order. The implicate order is the vast holomovement. We see only the surface of this movement as it presents or "explicates" itself from moment to moment in time and space. What we see in the world — the explicate order — is no more than the surface of the implicate order as it unfolds. Time and space are themselves the modes or forms of the unfolding process. They are like the screen on the video game. The displays on the screen may seem to interact directly with each other but, in fact, their interaction merely reflects what the game computer is doing. The rules which govern the operation of the computer are, of course, different from those that govern the behavior of the figures displayed on the screen. Moreover, like the implicate order of Bohm's model, the computer might be capable of many operations that in no way apparent upon examination of the game itself as it progresses on the screen."

"I believe there is no philosophical high-road in science, with epistemological signposts. No, we are in a jungle and find our way by trial and error, building our road behind us as we proceed. We do not find signposts at crossroads, but our own scouts erect them, to help the rest."

"If God has made the world a perfect mechanism, He has at least conceded so much to our imperfect intellect that in order to predict little parts of it, we need not solve innumerable differential equations, but can use dice with fair success."

"Can we call something with which the concepts of position and motion cannot be associated in the usual way, a thing, or a particle? And if not, what is the reality which our theory has been invented to describe? The answer to this is no longer physics, but philosophy. … Here I will only say that I am emphatically in favour of the retention of the particle idea. Naturally, it is necessary to redefine what is meant. For this, well-developed concepts are available which appear in mathematics under the name of invariants in transformations. Every object that we perceive appears in innumerable aspects. The concept of the object is the invariant of all these aspects. From this point of view, the present universally used system of concepts in which particles and waves appear simultaneously, can be completely justified. The latest research on nuclei and elementary particles has led us, however, to limits beyond which this system of concepts itself does not appear to suffice. The lesson to be learned from what I have told of the origin of quantum mechanics is that probable refinements of mathematical methods will not suffice to produce a satisfactory theory, but that somewhere in our doctrine is hidden a concept, unjustified by experience, which we must eliminate to open up the road."

"Intellect distinguishes between the possible and the impossible; reason distinguishes between the sensible and the senseless. Even the possible can be senseless."

"I am now convinced that theoretical physics is actually philosophy. It has revolutionized fundamental concepts, e.g., about space and time (relativity), about causality (quantum theory), and about substance and matter (atomistics). It has taught us new methods of thinking (complementarity), which are applicable far beyond physics."

"The continuity of our science has not been affected by all these turbulent happenings, as the older theories have always been included as limiting cases in the new ones."

"I must give some attention to the delicate question of religion, on which I have touched already. In my father's generation this question still was discussed with passion. Since then a sort of truce has existed in the countries of the West, while in the communist states of the East atheism has been made into the State religion. It is not advisable to blow on the embers of such controversies. But as I am talking about the limitations of our physical world picture I cannot but say that I do not believe in transgressions of the laws of nature. As these laws are of a statistical nature, and therefore allow deviations from the norm, I must define more clearly what I mean. The statistical deviations themselves obey certain laws. The miraculous events of religious tradition, however, are of a different kind, they lie on a different plane altogether; they are meant to prove something lying entirely beyond scientific consideration, such as the power of prayer, the intervention of divine power for or against certain men or nations."

"It is true that many scientists are not philosophically minded and have hitherto shown much skill and ingenuity but little wisdom."

"I... refer to the... Waynflete Lectures given by... E. D. Adrian, on The Physical Background of Perception because the results of physiological investigations seem... in perfect agreement with my suggestion about the meaning of reality in physics. The messages which the brain receives have not the least similarity with the stimuli. They consist in pulses of given intensities and frequencies, characteristic for the transmitting nerve-fiber, which ends in a definite place in the cortex. All the brain 'learns' (I use... the objectionable language of the 'disquieting figure of a little hobgoblin sitting... aloft in the ') is a distribution or a 'map' of pulses. From this information it produces the image of the world by a process which can metaphorically be called a consummate place of combinatorial mathematics: it sorts out of the maze of indifferent and varying signals invariant shapes and relations which form the world of ordinary experience."

"The belief that there is only one truth and that oneself is in possession of it, seems to me the deepest root of all that is evil in the world."

"There are metaphysical problems, which cannot be disposed of by declaring them meaningless. For, as I have repeatedly said, they are "beyond physics" indeed and demand an act of faith. We have to accept this fact to be honest. There are two objectionable types of believers: those who believe the incredible and those who believe that "belief" must be discarded and replaced by "the scientific method.""

"The scientist's urge to investigate, like the faith of the devout or the inspiration of the artist, is an expression of mankind's longing for something fixed, something at rest in the universal whirl: God, Beauty, Truth. Truth is what the scientist aims at. He finds nothing at rest, nothing enduring, in the universe. Not everything is knowable, still less predictable. But the mind of man is capable of grasping and understanding at least a part of Creation; amid the flight of phenomena stands the immutable pole of law."

"The dance of atoms, electrons and nuclei, which in all its fury is subject to God's eternal laws, has been entangled with another restless Universe which may well be the Devil's: the human struggle for power and domination, which eventually becomes history. My optimistic enthusiasm about the disinterested search for truth has been severely shaken. I wonder at my simplemindedness when I re-read what I said on the modern fulfilment of the alchemists dream: "Now however, the motive is not the lust for gold, cloaked by the mystery of magic arts, but the scientists' pure curiosity. For it is clear from the beginning that we may not expect wealth too." Gold means power, power to rule and to have a big share in the riches of this world. Modern alchemy is even a short-cut to this end, it provides power directly; a power to dominate and to threaten and hurt on a scale never heard of before. And this power we have actually seen displayed in ruthless acts of warfare, in the devastation of whole cities and the destruction of their population."

"In combination with other infernal contraptions, like rockets to deliver bombs at large distances, chemical, biological and radioactive poisons, such a war must mean a degree of human suffering and degradation which is beyond the power of imagination. No country would be immune, but those with highly developed industry would suffer most. It is very doubtful whether our technological civilization would survive such a catastrophe. One may be inclined to regard this as no great loss, but as a just punishment for its shortcomings and sins: the lack of productive genius in art and literature, the neglect of the moral teachings of religion and philosophy, the slowness to abandon outdated political conceptions, like national sovereignty. Yet we are all involved in this tragedy, and the instinct of self-preservation, the love of our children, makes us think about a way of salvation."

"America has grown by expansion in a practical vacuum; the pioneers of the West had to overcome terrific natural obstacles, but negligible human resistance. The Russia of today had to conquer not only natural but human difficulties: she had to break up the rotten system of the Czars and to assimilate backward Asiatic tribes; now she has set herself the task of bringing her brand of modernization to the ancient civilizations of the Far East. For this purpose it is indispensable to have a well-defined doctrine full of slogans, which appeals to the needs and instincts of the poverty-stricken masses. Thus one understands the power which Marx's philosophy has gained in the East. What can we scientists do in this conflict? We can join the spiritual, religious, philosophical forces, which reject war on ethical grounds. We can even attack the ideological foundations of the conflict itself. For science is not only the basis of technology but also the material for a sound philosophy."

"The world of Man's experience is infinitely rich and manifold, but chaotic and involved with the experiencing being. This being strives to arrange his impressions and to agree with others concerning them. Language and art, with their numerous modes of expression, are such ways of transmission from mind to mind, complete in their way where objects of the sense-world are concerned, but not well suited to the communication of exact ideas concerning the outer world. This marks the beginning of the task of science. From the multitude of experiences it selects a few simple forms, and constructs from them, by thought, an objective world of things. In physics, all 'experience' consists of the activity of constructing apparatus and of reading pointer instruments. Yet the results thereby obtained suffice to re-create the cosmos by thought. At first images are formed which are much influenced by observation; gradually, the conceptions become more and more abstract, old ideas are rejected and replaced by new ones. But, however far the constructed world of things departs from observation, nevertheless it is indissolubly linked at its boundaries to the perceptions of the sense, and there is no statement of the most abstract theory that does not express, ultimately, a relation between observations. That is why each new observation shakes up the entire structure, so that theories seem to rise and fall. This, however, is precisely what charms and attracts the scientist. The creation of his mind would be a melancholy thing, did it not die and come to life once more."

"He [Einstein] calls my way of describing the physical world 'incomplete'; in his eyes this is a flaw which he hopes to see removed, while I am prepared to put up with it. I have in fact always regarded it as a step forward, because an exact description of the state of a physical system presupposes that one can make statements of infinite precision about it, and this seems absurd to me. It seems to me that I have followed Einstein's own way of thinking in accordance with his theory of relativity, which recognizes the impossibility of locating any point in time and space absolutely, and therefore concludes that the concept of absolute place and time determination does not make sense. This is at the base of the whole of his mighty edifice. But he did not want to acknowledge the analogy of the situation in the quantum theory."

"While Born evidently realised that our extended order no longer gratified primitive instincts, he too failed to examine closely the structures that create and maintain this order, or to see that our instinctual morals have over the past five thousand years or more gradually been replaced or restrained. Thus, although perceiving that 'science and technology have destroyed the ethical basis of civilisation, perhaps irreparably', he imagines that they have done so by the facts they have uncovered rather than by their having systematically discredited beliefs that fail to satisfy certain 'standards of acceptability' demanded by constructivist rationalism (see below). While admitting that `no one has yet devised a means of keeping society together without traditional ethical principles', Born yet hopes that these can be replaced 'by means of the traditional method used in science'. He too fails to see that what lies between instinct and reason cannot be replaced by 'the traditional method used in science'."

"He felt that what is called “Copenhagen interpretation” should be called “Göttingen interpretation,” and was a bit hurt that he got the Nobel rather late."

"Incomplete knowledge of the future, and also of the past of the transmitter from which the future might be constructed, is at the very basis of the concept of information. On the other hand, complete ignorance also precludes communication; a common language is required, that is to say an agreement between the transmitter and the receiver regarding the elements used in the communication process... [The information of a message can] be defined as the 'minimum number of binary decisions which enable the receiver to construct the message, on the basis of the data already available to him.' These data comprise both the convention regarding the symbols and the language used, and the knowledge available at the moment when the message started."

"I do not know of anything in modern poetry as violently hostile to contemporary life as was the poetry of T. S. Eliot, which so perfectly fitted the mood of the young people between the two wars. I also find much more benevolence towards humanity in younger historians than there was in Spengler or in Toynbee. Still, it is not difficult to sense the disgust of the intellectuals at the new prosperous working class, 'with their eyes glued to the television screen,' who have become indifferent to radical ideas."

"It would be pleasant to believe that the age of pessimism is now coming to a close, and that its end is marked by the same author who marked its beginning: Aldous Huxley. After thirty years of trying to find salvation in mysticism, and assimilating the Wisdom of the East, Huxley published in 1962 a new constructive utopia, The Island. In this beautiful book he created a grand synthesis between the science of the West and the Wisdom of the East, with the same exceptional intellectual power which he displayed in his Brave New World. (His gaminerie is also unimpaired; his close union of eschatology and scatology will not be to everybody's tastes.) But though his Utopia is constructive, it is not optimistic; in the end his island Utopia is destroyed by the sort of adolescent gangster nationalism which he knows so well, and describes only too convincingly. This, in a nutshell, is the history of thought about the future since Victorian days. To sum up the situation, the sceptics and the pessimists have taken man into account as a whole; the optimists only as a producer and consumer of goods. The means of destruction have developed pari passu with the technology of production, while creative imagination has not kept pace with either. The creative imagination I am talking of works on two levels. The first is the level of social engineering, the second is the level of vision. In my view both have lagged behind technology, especially in the highly advanced Western countries, and both constitute dangers."

"The future cannot be predicted, but futures can be invented. It was man's ability to invent which has made human society what it is."

"I like teaching and the contact with young minds keeps one on one's toes."

"People who get Nobel prizes aren't necessarily the most imaginative of people. People who sometimes find a system, develop a system, do very useful work."

"It is very difficult for us, placed as we have been from earliest childhood in a condition of training, to say what would have been our feelings had such training never taken place."

"The properties of bodies were investigated by several distinguished French mathematicians on the hypothesis that they are systems of molecules in equilibrium. The somewhat unsatisfactory nature of the results... produced... a reaction in favour of the opposite method of treating bodies as if they were... continuous. This method, in the hands of Green, Stokes, and others, has led to results the value of which does not at all depend on what theory we adopt as to the ultimate constitution of bodies."

"Most probably some law hitherto undiscovered exists."

"All scientists must communicate their work, for what is the point of learning new things about how the world works if you don't tell anyone about them?"

"The difficulty, as in all this work, is to find a notation which is both concise and intelligible to at least two people of whom one may be the author."

"The Higgs is a very special type of particle - one we've never seen before. It has strange properties that we need to understand. This award was a complete surprise to me. It's really quite humbling and of course I'm delighted to receive it. I'm over the moon to be frank."

"We have a design [special characteristics of the detector] which is entirely based on a single magnet, a high field solenoid. The first thing one actually does in the design of the experiment is actually to figure out the magnetic field configuration for the measurement of muons. That then determines the rest of the design. The detector is built such that [see diagram] the first layer is within a tracker, which is all silicon."

"The Large Hadron Collider (LHC) is a discovery machine. We are actually looking to make discoveries. So, I think that’s the name of the game. As the data come in, the emphasis will be on the high statistical significance of the statements that we make at the end of the programme – we are half way through the LHC programme today and so [there is] another 10-15 years to go. The name of the game is actually to retrieve all the physics that is at this special energy scale of the LHC. There is some magic, I think, about this energy scale."

"The good thing about Higgs is that depending on the mass it actually manifests itself inside the detector in completely different ways. And many different ways depending on the mass, and we have to cover all the different ways and, in fact, when you have done you find that detector can do anything that the nature has in store for us. Anything."

"An Indian-origin physicist, best known for his work on the Large Hadron Collider experiment, has been accorded an honorary knighthood by Britain's Queen Elizabeth II for his achievements in science."

"CERN physicist, Tejinder Virdee has done search for the elusive Higgs boson, also known as the "God particle"."

"Tejinder set about building a detector within the Large Hadron Collider that's capable of taking forty million phenomenally detailed images every second. Finding the Higgs will validate everything physicists think they know about the very nature of the universe: not finding it, will force them back to the drawing board."

"He developed new technologies within the detector that ultimately allowed it to find the Higgs - the mechanism which explains how sub-atomic particles came to have substance, or mass."

"Professor Virdee is one of the UK's most distinguished physicists and, as one of the creators of the Compact Muon Solenoid (CMS) Experiment he has made outstanding contributions to science. The CMS experiment, at the Large Hadron Collider, CERN, Geneva, has delivered seminal results in particle physics, including the groundbreaking discovery of the Higgs Boson, or the God particle, a particle that gives mass to other particles. Beyond his innovative work in particle physics, he is also a great campaigner for science, and promoter of science and education in Africa and India"

"He was involved in the development of the CMS detector concept from the earliest days and has been influential in many areas of the detector design. The innovative concepts in CMS are likely to influence the next generation of high-energy physics experiments. He proposed the idea of discovering the elusive Higgs boson via its decay into two photons, which is central to the concept of the high resolution lead-tungstate crystal calorimeter, one of the major components of the CMS design."

"All the knowledge we have of nature depends upon facts; for without observations and experiments our natural philosophy would only be a science of terms and an unintelligible jargon. But then we must call in Geometry and Arithmetics, to our Assistance, unless we are willing to content ourselves with natural History and conjectural Philosophy. For, as many causes concur in the production of compound effects, we are liable to mistake the predominant cause, unless we can measure the quantity and the effect produced, compare them with, and distinguish them from, each other, to find out the adequate cause of each single effect, and what must be the result of their joint action."

"When mons. Descartes's philosophical Romance, by the Elegance of its Style and the plausible Accounts of natural Phænomena, had overthrown the Aristotelian Physics, the World received but little Advantage by the Change: For instead of a few Pedants, who, most of them, being conscious of their Ignorance, concealed it with hard Words and pompous Terms; a new Set of Philosophers started up, whose lazy Disposition easily fell in with a Philosophy, that required no Mathematicks to understand it, and who taking a few Principles for granted, without examining their Reality or Consistence with each other, fancied they could solve all Appearances mechanically by Matter and Motion; and, in their smattering Way, pretended to demonstrate such things, as perhaps Cartesius himself never believed ; his Philosophy (if he bad been in earnest) being unable to stand the test of the Geometry which he was Master of."

"It is to Sir Isaac Newton's Application of Geometry to Philosophy, that we owe the routing of this Army of Goths and Vandals in the philosophical World; which he has enriched with more and greater Discoveries, than all the Philosophers that went before him: And has laid such Foundations for future Acquisitions, that even after his Death, his Works still promote natural Knowledge. Before Sir Isaac, we had but wild Guesses at the Cause of the Motion of the Comets and Planets round the Sun', but now he has clearly deduced them from the universal Laws of Attraction (the Existence of which he has proved beyond Contradiction) and has shewn, that the seeming Irregularities of the Moon, which Astronomers were unable to express in Numbers, are but the just Consequences of the Actions of the Sun and Earth upon it, according to their different Positions. His Principles clear up all Difficulties of the various Phænomena of the Tides; and the true Figure of the Earth is now plainly shewn to be a flatted Spheroid higher at the Equator than the Poles, notwithstanding many Assertions and Conjectures to the contrary."

"But to return to the Newtonian Philosophy: Tho' its Truth is supported by Mathematicks, yet its Physical Discoveries may be communicated without. The great Mr. Locke was the first who became a Newtonian Philosopher without the help of Geometry; for having asked Mr. Huygens, whether all the mathematical Propositions in Sir Isaac's Principia were true, and being told he might depend upon their Certainty; he took them for granted, and carefully examined the Reasonings and Corollaries drawn from them, became Master of all the Physics, and was fully convinc'd of the great Discoveries contained in that Book."

"To few Freemasons of the present day, except to those who have made Freemasonry a subject of especial study, is the name of Desaguliers very familiar. But it is well that they should know that to him, perhaps, more than to any other man, are we indebted for the present existence of Freemasonry as a living Institution, for it was his learning and social position that gave a standing to the Institution, which brought to its support noblemen and men of influence so that the insignificant assemblage of four London Lodges at the Apple-Tree Tavern has expanded into an association which now shelters the entire civilized world. And the moving spirit of all this was John Theophilus Desaguliers."

"Born approximation is a familiar and convenient approximation in handling scattering problems. It is adequate, or at least informative, in so many cases that we tend to develop the habit of using its first-order term without always checking the conditions for its applicability."

"An important episode for my understanding of conduction problems arose from a paper by Kretschmann, ... who attacked the then accepted theory of conductivity and claimed that the basis of the papers by Bloch and others was quite wrong. He had a number of objections which were mostly not very well conceived, but he claimed, in particular, that in the usual derivation of the Boltzmann equation one had made unjustified use of perturbation theory. In trying to defend the theory I therefore set out to prove that perturbation theory was in order, and to my amazement I found that this was very questionable, if not exactly for the reasons given by Kretschmann. It appeared that the usual application of Fermi's 'golden rule' depended on the inequality ħ/τ ≪ kT, where τ is the collision time. This was not satisfied for many metals. Indeed Landau's dimensional analysis made them comparable. ..."

"Any theoretical physicist has met, in his introduction to the subject, the simplest examples of Schrödinger's equation, including the harmonic oscillator. In demonstrating its solution, it is usually shown that for energies satisfying the usual quantum condition, E = (n + ½)ħω (1.1.1) where n is a non-negative integer and ω the frequency, the equation has a solution satisfying the correct boundary conditions. It is equally important to know that these are the only solutions, i.e., that for an energy not equal to (1.1.1) no admissible solution exists. This negative statement is not usually proved in elementary treatments, or else it is deduced from quite elaborate discussions of the convergence and behavior of a certain infinite series. It is therefore surprising to find that the result can be seen without any complicated algebra."

"The atoms which constitute a solid consist of nuclei and electrons. For a description of the state of the solid it is not, however, necessary to specify the state of all the Z electrons of each atom, since we can eliminate most or all of them by a principle that is familiar from the theory of molecules. ... Since the atomic nuclei are much heavier than the electrons, they move much more slowly, and it is therefore reasonable to start from the approximation in which they are taken to be taken to be at rest, though not necessarily in the regular positions."

"1.4 Types of binding ... The most important types of force are as follows: (a) Electrostatic forces. In an ionic crystal the attraction is mainly due to the Coulomb interaction between point charges. This is particularly amenable to calculation, and a great deal of work has been done on it. The force is a 'two-body' force, i.e. the interaction between two given ions is independent of the positions of any other ions that may be present. ... (b) Van der Waals forces. This name describes the effect that a neutral and isotropic atom can acquire a polarization under the influence of an electric field, and even two neutral isotropic atoms will induce small dipole moments in each other, due to the fluctuating moments which they possess because of the existence of virtual excited states. ... (c) Homopolar binding. These are forces like those effective in homopolar molecules, and we know they are due to the exchange of electrons between the atoms. In molecular crystals (H2, Cl2, etc.) these bonds can easily be localized and we can start from a description of the molecular by the methods of quantum chemistry and then add the relatively weak forces between different molecules. In other cases, however, such as diamond or graphite, each atom shares some valence electrons with each of its neighbors, and it is therefore not possible to single out any given groups of atoms that may be regarded as chemically saturated. The quantitative discussion of such forces is not easy. ... (d) Overlap. If two atoms approach so closely that their electron shells overlap, then there is a strong repulsive force between them. ... (e) Metallic bond. ... it is worth noting that in the case of a metal the presence and motion of the conduction electrons is an important factor in holding the crystal together and in determining its structure."

"With both light and electrons, one was faced with the so-called "wave-particle duality"; both could be regarded as waves for some purposes and as particles for others. An important step in resolving this paradox was a paper by Max Born in July 1926, in which he suggested that the waves determine the probability of finding the particle in a particular place. This idea was already considered much earlier by Einstein, but it was rejected by him. This interpretation of the theory was further developed in the spring of 1927 by Heisenberg, who formulated his "uncertainty principle" ..."

"At about this same time Dirac wrote a paper that proposed a general theory of how measurements should be described in quantum mechanics. Similar work was also done by P. Jordan in Göttingen. These two papers constitute what is called transformation theory, because they show how one can transform information gained by measuring one quantity into predicting information about another."

"When I arrived in Leipzig, Heisenberg was working on the theory of ferromagnetism. It was known the magnetism of such substances as iron was due to the "spin" of the electrons inside the substance. Each electron spins like a little top, and in the iron there is a "molecular field", a force that tends to align the spin of each electron with that of its neighbors. But the nature of this field was unknown. It could not be a magnetic effect because magnetic forces are much too weak to account for the observed behaviour. Heisenberg saw that the answer lay in the Pauli exclusion principle, which says that no two electrons can be in exactly the same state. Thus two electrons with the same spin orientation keep out of each other's way; while this repulsion may increase their energy of motion, it diminishes their mutual repulsion, and can therefore lead to a decrease in total energy, making the parallel alignment of the electron spins energetically favourable. He had encountered this mechanism in the theory of atomic spectra and concluded that it was also responsible for ferromagnetism."

"His contributions to condensed matter physics were largely on fundamental questions, establishing the principles of this subject. Most of this work was done during the years 1928–37, but much of it could not be tested until the experimental techniques needed for this had become sufficiently developed. ... Rudolf Peierls's work in nuclear physics began in 1933, when James Chadwick challenged him and Hans Bethe to explain his first measurements of the cross-section for photo-disintegration of the deuteron. Peierls's experience in this field developed rapidly within the next few years, on both practical questions and academic research, to the point where he and Otto Frisch could confidently conclude that the construction of an atomic bomb would be quite possible using 235U, which could be obtained obtained from natural uranium by a feasible separation process, and they pointed this out in the famous Frisch-Peierls Memorandum of 1940 which they sent to the British government. This led to the Atomic Bomb Project, at first in Britain under the name "Tube Alloys Project" and later in USA as the "Manhattan District Project", which many of the UK scientists, including both Peierls and Frisch, were sent to join at the end of 1943."

"Richard Dalitz, in: (quote from page v)"

"It is Rudi's genius to show the reader in concrete terms how to do the predicting after some organized thinking."

"After the war, Bethe went back to Cornell, where he helped build an outstanding research center in high-energy physics. Peierls returned to Birmingham, where he created the outstanding school of theoretical physics in Western Europe. The two physicists established a pipeline between the two institutions and offered their generous evaluations of the young postdocs and colleagues—Hugh McManus, Edwin Salpeter, Stuart Butler, Richard Dalitz, Freeman Dyson, and others—that they sent to one another. Their correspondence likewise gives perceptive overviews of advances in high-energy physics, especially of the progress made after 1955 in the nuclear many-body problem on which Bethe was concentrating. Their letters also concern policy challenges posed by, for example, the cold war, nuclear weaponry, nuclear test ban treaties, and antiballistic missiles."

"It is argued that the type IIA 10-dimensional superstring theory is actually a compactified 11-dimensional supermembrane theory in which the fundamental supermembrane is identified with the soltionic membrane of 11-dimensional supergravity. The charged extreme black holes of the 10-dimensional type IIA string theory are interpreted as the Kaluza-Klein modes of 11-dimensional supergravity and the dual sixbranes as the analogue of Kaluza-Klein monopoles. All other p-brane solutions of the type IIA superstring theory are derived from the 11-dimensional membrane and its magnetic dual fivebrane soliton."

"In the case of parallel multi D-branes there can be open strings with one end on one brane and the other end on another brane. Classically, such a string has a minimum energy proportional to the distance between the branes. Supersymmetry ensures that this remains true quantum-mechanically, so additional massless states can appear only when two or more D-branes coincide."

"To get the string of string theory, you have to imagine taking a violin string and just keep pulling on the two ends. Now, if you keep pulling, what happens of course is that the waves on the string move along at a certain speed which depends on the tension with which you pull it. And if you keep pulling on the violin string of course a real one will break. But if you imagine that you keep pulling, then at some point the speed of the waves on the string will increase indefinitely. But not of course indefinitely because there's a fundamental limit which is the speed of light. So when you've reached the point where you pull on your violin strings and you've stretched it to the point where actually the waves on it are now moving at the speed of light, then you have a very strange material and that material is the string of string theory. In a way the branes are essentially the same material but just more extended."

"Thus, even now, three and a half centuries after Galileo... it is still remarkably difficult to say categorically whether the earth moves..."

"In fact, I once had a discussion with a distinguished astrophysicist who said to me, well, this is what Mach said, and this is what Mach did and what he required. And I said to him, now excuse me, if you don't mind me saying, what you've just told me is your interpretation of Dennis Sciama's interpretation of Einstein's interpretation of Mach. And he said you're quite right. I’ve never read a word of Mach."

"(quote at 14:08 of 1:54:14)"

"[[Time|[T]ime]] is really an illusion... and motion too... [T]hey are not really there in the external world. They are put into the world by us, in the way we interpret it, and by our brains..."

"If you could freeze the camera now and... show me as I am, and all the atoms... and... the whole universe... like a snapshot, the would be... a NOW."

"If you could look microscopically... at... my molecules... you would not recognize me from one second to another. In my body, every second, one hundred million million million... hemoglobin molecules... is destroyed, and the same number is created. So... at each split second, I'm really a very different person."

"[T]he work that I did with... has shown... time that is measured by clocks is... an average of all the changes in the universe."

"[I]f you imagine two NOWs... there will be some difference between them, and if you work out some weighted average of all of that difference... you can call that... the amount of time between them. ...[T]his has nothing to do with some substance... It's just difference between those two things. ...[T]his is the quantity that is... being measured by my watch..."

"[T]his is very different from the Newtonian picture where Newton presupposes there's a river of time flowing, that is there before anything is put into it. ...[T]he things are there first, and the time is deduced from it afterwards."

"[A NOW] has no duration. ...[I]t's absolutely instantaneous. There is no thickness to it. Nothing changes. ...So these s, in one sense, are truly eternal, because they never change, and on the other hand, because nothing changes, they are experienced as a flash. ...[It]'s a nice contradiction... [T]he eternal is experienced as a flash, because nothing changes."

"There is nothing in between... [NOWs]. Each are separate snapshots. ...These [real photographs] ...are not changed by ...reversing the order ...It may be convenient for ...for the way we think about the world and for ordering our experiences, to suppose that these come in a certain order; but ...the picture is not changed... the snapshot is... self-contained."

"[W]hat we call yesterday is self-contained and has its experience of being yesterday, and today has memories of yesterday; and therefor I say that it's later... but each is completely self-contained, and there's no reason why you should put one... here, and another one there..."

"How do you define duration? What does it mean to say that a second today is the same as a second tomorrow? Newton in his... Principia... 1687, gave a... definition of absolute time, which he says flows uniformly without relation to anything external... [H]e says... if nothing... were to happen in the universe... if everything froze... time would still pass uniformly. ...[S]o ...time exists before anything else..."

"Richard Feynman... said, "Time is what happens when nothing else does." ...[T]hat's ...not the right way to think about time."

"[I]n 1898... Henri Poincaré wrote... "On the Measure of Time" and he said... there are two fundamental problems to do with time. One... with the definition of duration... What does it mean to say that a second today is the same... [H]e said there's another issue... [not] so widely recognized. ...[H]ow do you define simultaneity at spatially separated points?"

"He... explain[ed] how the astronomers... had to grapple with the problem of defining definition, because for 2 1/2 millennia there had been just one standard of time... the rotation of the earth. ...[T]hat had provided an incredibly accurate clock. It's... lost only a few hours in 2 1/2 thousand years. ...Very easy to use. Astronomers only... had to glance at the night sky, at the... Big Dipper... to tell the time within a minute or two... But in the 1890s a crisis developed when they found that using the earth... and... Newton's laws of motion and gravity... the Moon was speeding up. ...[T]hey thought ...the earth was slowing down because of the tidal effects of the moon... and... this would mean that the earth was not a good timekeeper at the accuracy that they wanted."

"Poincaré clearly posed these two problems and... seven years later... independently... Einstein and Poincaré... solved... the problem of defining definition at spatially separated points..."

"Einstein... revealed... extraordinary things... [H]is space and time seem to be knit together in a way you can't pull them apart... [S]omeone moving relative to me at any speed would... divide space and time in different ways... [T]he huge excitement about simultaneity meant that the... issue of duration has... been forgotten..."

"Wheeler argued that anything physical... derives its... existence... from discrete detector-elicited information-theoretic answers to yes or no quantum binary choices: bits."

"[T]hings, not information, are primary. ... 'bit' derives from 'it'."

"I argue... this weakens but not necessarily destroys the argument that nature is fundamentally digital and continuity an illusion."

"Ontological primacy should not be given to information but to things, as has always been the standpoint of realists."

"I find no reason to reverse the standard assumption of physics... what we experience can be explained by the assumption of an external world governed by law."

"It is a mistake to believe that the digits 0 and 1, being abstract, represent the immaterial. Quite... the contrary... they stand for something quintessentially concrete."

"Greek astronomers observed intricate motions of the sun, moon, and planets on the two-dimensional sky. They explained them—saved the appearances—by positing simple regular motions... in three dimensions. The success... [was] brought to a triumphant conclusion by Kepler..."

"Shannon information... [which] he also called entropy or ... involves things (...Shannon ...messages) and probabilities for those things."

"[[Symbols|[S]ymbols]] have no meaning if divorced from the entities that they represent."

"The concepts of message and probability enable one, for a definite source of N messages, to define Shannon’s information. If p_i,\quad i = 1, 2, ..., N, is the relative probability of message i and \log p_i is its base-2 logarithm, then the information I of the given source is(1) \quad I = - \sum_{k=1}^N p_i \log p_i.The minus sign makes I positive because all probabilities, which are necessarily greater than or equal zero, are less than unity (their sum being\textstyle \sum_{i}^N p_i = 1, so that their logarithms are all negative."

"and variety are central to my critique of 'it from bit'. For we can only talk meaningfully about a thing, including a , if it has distinguishing attributes. The way that they are knit together, as in the taste, shape and colour of an apple, defines the structure of the thing."

"There is one metalaw of science: it cannot exist without structured things. d variety is the ground of being. That is what gives content to both science and life."

"Consider the example of a time capsule... geologists... establish[ed] detailed correlations between the structure of fossils and rocks... They concluded... an immense , vastly longer than the bible-deduced... 6000 years. They explained... a long process... in accordance with... laws of nature. They discovered ... and... present evidence for it extends today... to all branches of science, especially cosmology and genetics."

"[[wikt:stability#Noun|[S]tability]] of solids, the fossils and rocks... exist... essentially unchanged. ...[T]he configuration carries intrinsic semantic information... different intelligent beings can in principle deduce the law or process.. Support for this is is the independent discovery of evolution by natural selection by Wallis and Darwin."

"[W]e must distinguish three kinds of information: [1] Shannon’s information, the uncertainty as to which message will be selected from a source; [2] factual information, the content of such a message; and [3] intrinsic semantic information, which distinguishes a random message, or configuration, from one that carries meaning and to some extent explains its... genesis. All... have... underpinning in things."

"Shannon-type message sources could not exist if the universe were not subject to laws of nature and far from ."

"Information theory would never have got off the ground if structured things—configurations—did not exist."

"Probabilities without things are... nothings."

"If we are to speak about ontology, as opposed to efficient coding in communication channels, the most important symbol in (1) is not p for probability but i for the thing, or configuration, that has the probability p_i."

"A more serene vision of the end comes from Julian Barbour, a philosopher who has collaborated with cosmologists in building a peculiar picture of reality that he calls Platonia. In Platonia, all possible configurations of matter exist. There is no passage of time, merely a set of unconnected instants, or "nows". We experience the illusion of time because many of these nows are arranged as if they had evolved through time. Barbour thinks that the possibilities in Platonia should be infinite, and so the comforting illusion of time should be infinite too."

"[A]t least naively time has completely disappeared from the formalism. This has led to what is called the " in ", which is how to either A) find an interpretation of the theory that restores a role for time or B) provide an interpretation according to which time is not part of a fundamental description of the world, but only reappears in an appropriate classical limit. ...The most well formulated attempt of type B), which is that of Barbour, may very well be logically consistent. But it forces one to swallow quite a radical point of view about the relationship between time and our experience."

"[T]ime is not an illusion, but the flow of time is. So is change. In spacetime, the future exists and the past doesn't disappear. When we combine Einstein's classical spacetime with quantum mechanics, we get quantum parallel universes... This means there are many pasts and futures that are all real—but this in no way diminishes the unchanging mathematical nature of the full physical reality. ...[A]lthough this idea of an unchanging reality is venerable and dates back to Einstein, it remains controversial... with scientists I greatly respect expressing a spectrum of views. ...Julian Barbour argues in his book The End of Time not only that change is illusory, but that one can even describe physical reality without introducing the time concept at all."

"... of may allow us to say that "this object is hotter or colder than that one." But even this apparently simple statement is fraught with pitfalls for the unwary. For example, take hold in turn of a block of , a piece of expanded and a rod of , all near room temperature but differing slightly slightly in temperature from one another. It is not easy to make any useful statements about which is hotter or colder. This means, of course, that the is a poor thermometer, but the reasons for this being so are by no means straight-forward: they are related to the way in which sensations of hotness and coldness are generated in the human body ..."

"It has long been recognized that the basic units in science – such as the and the – should be defined in terms of fundamental physical phenomena. Indeed in 1870 James Clerk Maxwell recognized that the units of , and would only remain unchanged and reproducible if they were defined by the , period of vibration and absolute mass of molecules rather than by the physical properties of the Earth. However, it took over a century for the metre and the second to be defined in terms of the quantum properties of atoms. And it was only in 1990 that reproducible standards of and were linked to quantum phenomena."

"In my house I have four , I sometimes adjust them so that at least two, but rarely more than three, strike the hour within a few seconds of each other. Fortunately, the pleasure I get from my clocks does not depend on them all telling the same time. When I switch on the in my car, however, things are different. It very quickly latches on to at least four atomic clocks high in the sky, all of which tell the same time to about a hundred millionth of a second. If they did not, my GPS would guide me to somewhere other than my desired destination."

", the science of measurement, is part of the essential but largely hidden infrastructure of the modern world. We need it for high-technology manufacturing, human health and safety, the protection of the environment, global climate studies and the basic science that underpins all these. Highly accurate measurements are not exclusively the preserve of the and engineering; many areas of chemistry, and medicine are now dependent on accurate quantitative measurements. in all manufactured and agricultural products is strictly controlled by regulations that need accurate metrology for their implementation."

"On 19 March 1791 five of the great luminaries of French science, Laplace, Lagrange, Condorcet, and , met at the in Paris and drew up a document that laid down the definition of the new basic unit of length, the , for the proposed new system of measurement that would become the ."

"Astronomy has to be your life, not just your job, or you are unlikely to do well or be happy. If you are going to get married…then you must find a partner who is a true partner, because it is impossible to do everything yourself."

"It is 33 years since I got my PhD."

"I am currently Head of the Astronomy Division and I was Acting Director for about 18 months following the death of the Director."

"I have also been President of the South African Institute of Physics."

"The only woman and only astronomer to hold that position."

"What is clear in South Africa is that many things were strongly biased against women prior to our first democratic election in 1994."

"That bias has been more or less eliminated since."

"That is not to say that women occupy 50% of top posts, but there are at least some women in top posts and the profile of the workforce is gradually changing."

"The legislation that was put in place to try and remove racial discrimination."

"Is also dealing with other types of discrimination but it will take time."

"The racial imbalance in the workforce remains the major problem."

"At SAAO there are a few women in scientific posts."

"All in senior engineering or IT posts. Of the 25 astronomers on the SAAO staff, 5 are women only one of them born in South Africa."

"Of the 5 astronomers on the Executive Committee, I am the only woman."

"8 or 9 hours now, but I used to do 10 to 12 when I did more research."

"I have a husband, John Menzies, who is also an astronomer and who has always been very supportive."

"I do not have children, and am immensely impressed by women who do and also manage to be successful astronomers."

"Less bureaucracy would help in almost every single way."

"As far as my career is concerned I am sure I have got where I am going."

"It is well worth it, but astronomy has to be your life, not just your job, or you are unlikely to do well or be happy."

"If you are going to get married and or have children then you must find a partner who is a true partner."

"It is impossible to do everything yourself."