Children S Authors

"The downside of my celebrity is that I cannot go anywhere in the world without being recognized. It is not enough for me to wear dark sunglasses and a wig. The wheelchair gives me away."

"As scientists, we understand the dangers of nuclear weapons and their devastating effects, and we are learning how human activities and technologies are affecting climate systems in ways that may forever change life on Earth. As citizens of the world, we have a duty to alert the public to the unnecessary risks that we live with every day, and to the perils we foresee if governments and societies do not take action now to render nuclear weapons obsolete and to prevent further climate change... There’s a realization that we are changing our climate for the worse. That would have catastrophic effects. Although the threat is not as dire as that of nuclear weapons right now, in the long term we are looking at a serious threat."

"The danger is that global warming may become self-sustaining, if it has not done so already. The melting of the Arctic and Antarctic ice caps reduces the fraction of solar energy reflected back into space, and so increases the temperature further. Climate change may kill off the Amazon and other rain forests, and so eliminate once one of the main ways in which carbon dioxide is removed from the atmosphere. The rise in sea temperature may trigger the release of large quantities of carbon dioxide, trapped as hydrides on the ocean floor. Both these phenomena would increase the greenhouse effect, and so global warming further. We have to reverse global warming urgently, if we still can."

"The victim should have the right to end his life, if he wants. But I think it would be a great mistake. However bad life may seem, there is always something you can do, and succeed at. While there's life, there is hope."

"Equations are just the boring part of mathematics. I attempt to see things in terms of geometry."

"It is a waste of time to be angry about my disability. One has to get on with life and I haven't done badly. People won't have time for you if you are always angry or complaining."

"I think that it's important for scientists to explain their work, particularly in cosmology. This now answers many questions once asked of religion."

"Evolution has ensured that our brains just aren't equipped to visualise 11 dimensions directly. However, from a purely mathematical point of view it's just as easy to think in 11 dimensions, as it is to think in three or four."

"I'm sorry to disappoint science fiction fans, but if information is preserved, there is no possibility of using black holes to travel to other universes. If you jump into a black hole, your mass energy will be returned to our universe but in a mangled form which contains the information about what you were like but in a state where it can not be easily recognized. It is like burning an encyclopedia. Information is not lost, if one keeps the smoke and the ashes. But it is difficult to read. In practice, it would be too difficult to re-build a macroscopic object like an encyclopedia that fell inside a black hole from information in the radiation, but the information preserving result is important for microscopic processes involving virtual black holes."

"The life we have on Earth must have spontaneously generated itself. It must therefore be possible for life to generate spontaneously elsewhere in the universe."

"My expectations were reduced to zero when I was 21. Everything since then has been a bonus."

"I am discounting reports of UFOs. Why would they appear only to cranks and weirdos?"

"Life would be tragic if it weren't funny."

"I have no idea. People who boast about their IQ are losers."

"[on the possibility of contact with an alien civilization]: I think it would be a disaster. The extraterrestrials would probably be far in advance of us. The history of advanced races meeting more primitive people on this planet is not very happy, and they were the same species. I think we should keep our heads low."

"We shouldn't be surprised that conditions in the universe are suitable for life, but this is not evidence that the universe was designed to allow for life. We could call order by the name of God, but it would be an impersonal God. There's not much personal about the laws of physics."

"I don't think the human race will survive the next thousand years, unless we spread into space. There are too many accidents that can befall life on a single planet. But I'm an optimist. We will reach out to the stars."

"Although September 11 was horrible, it didn't threaten the survival of the human race, like nuclear weapons do."

"One might think this means that imaginary numbers are just a mathematical game having nothing to do with the real world. From the viewpoint of positivist philosophy, however, one cannot determine what is real. All one can do is find which mathematical models describe the universe we live in. It turns out that a mathematical model involving imaginary time predicts not only effects we have already observed but also effects we have not been able to measure yet nevertheless believe in for other reasons. So what is real and what is imaginary? Is the distinction just in our minds?"

"The world has changed far more in the past 100 years than in any other century in history. The reason is not political or economic but technological — technologies that flowed directly from advances in basic science."

"Thus it seems that even God is bound by the uncertainty principle, and can not know both the position, and the speed, of a particle. So God does play dice with the universe. All the evidence points to him being an inveterate gambler, who throws the dice on every possible occasion."

"All my life, I have been fascinated by the big questions that face us, and have tried to find scientific answers to them."

"Einstein was confused, not the quantum theory."

"It is not clear that intelligence has any long-term survival value."

"I think computer viruses should count as life … I think it says something about human nature that the only form of life we have created so far is purely destructive. We've created life in our own image."

"The human race is just a chemical scum on a moderate-sized planet, orbiting around a very average star in the outer suburb of one among a hundred billion galaxies. We are so insignificant that I can't believe the whole universe exists for our benefit. That would be like saying that you would disappear if I closed my eyes."

"I don't believe that the ultimate theory will come by steady work along existing lines. We need something new. We can't predict what that will be or when we will find it because if we knew that, we would have found it already! It could come in the next 20 years, but we might never find it."

"So Einstein was wrong when he said, "God does not play dice." Consideration of black holes suggests, not only that God does play dice, but that he sometimes confuses us by throwing them where they can't be seen."

"These lectures have shown very clearly the difference between Roger and me. He's a Platonist and I'm a positivist. He's worried that Schrödinger's cat is in a quantum state, where it is half alive and half dead. He feels that can't correspond to reality. But that doesn't bother me. I don't demand that a theory correspond to reality because I don't know what it is. Reality is not a quality you can test with litmus paper. All I'm concerned with is that the theory should predict the results of measurements. Quantum theory does this very successfully. It predicts that the result of an observation is either that the cat is alive or that it is dead. It is like you can't be slightly pregnant: you either are or you aren't."

"For millions of years, mankind lived just like the animals. Then something happened which unleashed the power of our imagination. We learned to talk and we learned to listen. Speech has allowed the communication of ideas, enabling human beings to work together to build the impossible. Mankind's greatest achievements have come about by talking, and its greatest failures by not talking. It doesn't have to be like this. Our greatest hopes could become reality in the future. With the technology at our disposal, the possibilities are unbounded. All we need to do is make sure we keep talking."

"We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special."

"What I have done is to show that it is possible for the way the universe began to be determined by the laws of science. In that case, it would not be necessary to appeal to God to decide how the universe began. This doesn't prove that there is no God, only that God is not necessary."

"Einstein is the only figure in the physical sciences with a stature that can be compared with Newton. Newton is reported to have said "If I have seen further than other men, it is because I stood on the shoulders of giants." This remark is even more true of Einstein who stood on the shoulders of Newton. Both Newton and Einstein put forward a theory of mechanics and a theory of gravity but Einstein was able to base General Relativity on the mathematical theory of curved spaces that had been constructed by Riemann while Newton had to develop his own mathematical machinery. It is therefore appropriate to acclaim Newton as the greatest figure in mathematical physics and the Principia is his greatest achievement."

"There ought to be something very special about the boundary conditions of the universe and what can be more special than that there is no boundary?"

"My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all."

"If you are disabled, it is probably not your fault, but it is no good blaming the world or expecting it to take pity on you. One has to have a positive attitude and must make the best of the situation that one finds oneself in; if one is physically disabled, one cannot afford to be psychologically disabled as well. In my opinion, one should concentrate on activities in which one's physical disability will not present a serious handicap. I am afraid that Olympic Games for the disabled do not appeal to me, but it is easy for me to say that because I never liked athletics anyway. On the other hand, science is a very good area for disabled people because it goes on mainly in the mind. Of course, most kinds of experimental work are probably ruled out for most such people, but theoretical work is almost ideal. My disabilities have not been a significant handicap in my field, which is theoretical physics. Indeed, they have helped me in a way by shielding me from lecturing and administrative work that I would otherwise have been involved in. I have managed, however, only because of the large amount of help I have received from my wife, children, colleagues and students. I find that people in general are very ready to help, but you should encourage them to feel that their efforts to aid you are worthwhile by doing as well as you possibly can."

"Many people would claim that the boundary conditions are not part of physics but belong to metaphysics or religion. They would claim that nature had complete freedom to start the universe off any way it wanted. That may be so, but it could also have made it evolve in a completely arbitrary and random manner. Yet all the evidence is that it evolves in a regular way according to certain laws. It would therefore seem reasonable to suppose that there are also laws governing the boundary conditions."

"I regard [the many worlds interpretation] as self-evidently correct. [T.F.: Yet some don't find it evident to themselves.] Yeah, well, there are some people who spend an awful lot of time talking about the interpretation of quantum mechanics. My attitude — I would paraphrase Goering—is that when I hear of Schrödinger's cat, I reach for my gun."

"The subject of this book is the structure of space-time on length-scales from 10-13cm, the radius of an elementary particle, up to 1028cm, the radius of the universe. ...we base our treatment on Einstein's General Theory of Relativity. This theory leads to two remarkable predictions about the universe: first, that the final fate of massive stars is to collapse behind an event horizon to form a 'black hole' which will contain a singularity; and secondly, that there is a singularity in our past which constitutes, in some sense, a beginning to the universe."

"I think many would enjoy and savor the fairy tales of Hans Christian Andersen much better as adults. I recommend the miraculous translations by Tiina Nunnally."

"At rejse er at leve."

"They could see she was a real Princess and no question about it, now that she had felt one pea all the way through twenty mattresses and twenty more feather beds. Nobody but a Princess could be so delicate."

"When he saw Tiny, he was delighted, and thought her the prettiest little maiden he had ever seen. He took the gold crown from his head, and placed it on hers, and asked her name, and if she would be his wife, and queen over all the flowers. This certainly was a very different sort of husband to the son of a toad, or the mole, with my black velvet and fur; so she said, "Yes," to the handsome prince. Then all the flowers opened, and out of each came a little lady or a tiny lord, all so pretty it was quite a pleasure to look at them. Each of them brought Tiny a present; but the best gift was a pair of beautiful wings, which had belonged to a large white fly and they fastened them to Tiny's shoulders, so that she might fly from flower to flower."

"I have now learnt to despise you," he said. "You refused an honest prince; you did not appreciate the rose and the nightingale; but you did not mind kissing a swineherd for his toys; you have no one but yourself to blame!"

"Death walks faster than the wind and never returns what he has taken."

"He felt himself melting away, but he still remained firm with his gun on his shoulder. Suddenly the door of the room flew open and the draught of air caught up the little dancer, she fluttered like a sylph right into the stove by the side of the tin soldier, and was instantly in flames and was gone. The tin soldier melted down into a lump, and the next morning, when the maid servant took the ashes out of the stove, she found him in the shape of a little tin heart. But of the little dancer nothing remained but the tinsel rose, which was burnt black as a cinder."

"I can give her no greater power than she has already," said the woman; "don't you see how strong that is? How men and animals are obliged to serve her, and how well she has got through the world, barefooted as she is. She cannot receive any power from me greater than she now has, which consists in her own purity and innocence of heart. If she cannot herself obtain access to the Snow Queen, and remove the glass fragments from little Kay, we can do nothing to help her."

"I have gone through the most terrible affair that could possibly happen; only imagine, my shadow has gone mad; I suppose such a poor, shallow brain, could not bear much; he fancies that he has become a real man, and that I am his shadow." "How very terrible,” cried the princess; "is he locked up?" "Oh yes, certainly; for I fear he will never recover." "Poor shadow!" said the princess; "it is very unfortunate for him; it would really be a good deed to free him from his frail existence; and, indeed, when I think how often people take the part of the lower class against the higher, in these days, it would be policy to put him out of the way quietly."

"Under each arm he carries an umbrella; one of them, with pictures on the inside, he spreads over the good children, and then they dream the most beautiful stories the whole night. But the other umbrella has no pictures, and this he holds over the naughty children so that they sleep heavily, and wake in the morning without having dreamed at all."

"Every time a good child dies, an angel of God comes down to earth. He takes the child in his arms, spreads out his great white wings, and flies with it all over the places the child loved on earth. The angel plucks a large handful of flowers, and they carry it with them up to God, where the flowers bloom more brightly than they ever did on earth."