"Not only are facts and theories in constant disharmony, they are never as neatly separated as everyone makes them out…"

"Taking experimental results and observations for granted and putting the burden of proof on the theory means taking t…"

"No single theory ever agrees with all the facts in its domain"

"[Responding to criticism from Dr. Hesse] Voodoo, Dr Hesse's piece de risistance', is case in point. Nobody knows it, …"

"Facts are constituted by older ideologies, and a clash between facts and theories may be proof of progress."

"The material which a scientist actually has at his disposal, his laws, his experimental results, his mathematical tec…"

"The validity of usefulness, adequacy of popular standards can be tested only by research that violates them."

"[continued conjecture on empiricism] At this point an "empirical" theory of the kind described becomes almost indisti…"

"Progress was often achieved by a "criticism from the past"… After Aristotle and Ptolemy, the idea that the earth move…"

"Now - how can we possibly examine something we use all the time and presuppose in every statement? How can we critici…"