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" The universe is very large, and its boundaries are not known very well, but it is still possible to define some kind of a radius to be associated with it. "

Richard P. Feynman

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" The situation in the sciences is this: A concept or an idea which cannot be measured or cannot be referred directly to experiment may or may not be useful. It need not exist in a theory. "

Richard P. Feynman

" We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on. "

Richard P. Feynman

" It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong. "

Richard P. Feynman

" Is science of any value? I think a power to do something is of value. Whether the result is a good thing or a bad thing depends on how it is used, but the power is a value. "

Richard P. Feynman

" Europeans are much more serious than we are in America because they think that a good place to discuss intellectual matters is a beer party. "

Richard P. Feynman

" All the evidence, experimental and even a little theoretical, seems to indicate that it is the energy content which is involved in gravitation, and therefore, since matter and antimatter both represent positive energies, gravitation makes no distinction. "

Richard P. Feynman

" Because the theory of quantum mechanics could explain all of chemistry and the various properties of substances, it was a tremendous success. But still there was the problem of the interaction of light and matter. "

Richard P. Feynman

" What goes on inside a star is better understood than one might guess from the difficulty of having to look at a little dot of light through a telescope, because we can calculate what the atoms in the stars should do in most circumstances. "

Richard P. Feynman

" The internal machinery of life, the chemistry of the parts, is something beautiful. And it turns out that all life is interconnected with all other life. "

Richard P. Feynman

" I got a signed document from Bullock's saying that they had such-and-such drawings on consignment. Of course, nobody bought any of them, but otherwise, I was a big success: I had my drawings on sale at Bullock's! "

Richard P. Feynman

" Do not keep saying to yourself, if you can possibly avoid it, 'But how can it be like that?' because you will get 'down the drain,' into a blind alley from which nobody has yet escaped. Nobody knows how it can be like that. "

Richard P. Feynman

" I practiced drawing all the time and became very interested in it. If I was at a meeting that wasn't getting anywhere - like the one where Carl Rogers came to Caltech to discuss with us whether Caltech should develop a psychology department - I would draw the other people. "

Richard P. Feynman

" I was a very shy character, always feeling uncomfortable because everybody was stronger than I, and always afraid I would look like a sissy. Everybody else played baseball; everybody else did all kinds of athletic things. "

Richard P. Feynman

" People often think I'm a faker, but I'm usually honest, in a certain way - in such a way that often nobody believes me! "

Richard P. Feynman

" Poets say science takes away from the beauty of the stars - mere globs of gas atoms. I, too, can see the stars on a desert night, and feel them. But do I see less or more? "

Richard P. Feynman

" It is always good to know which ideas cannot be checked directly, but it is not necessary to remove them all. It is not true that we can pursue science completely by using only those concepts which are directly subject to experiment. "

Richard P. Feynman

" Today, all physicists know from studying Einstein and Bohr that sometimes an idea which looks completely paradoxical at first, if analyzed to completion in all detail and in experimental situations, may, in fact, not be paradoxical. "

Richard P. Feynman

" In talking about the impact of ideas in one field on ideas in another field, one is always apt to make a fool of oneself. "

Richard P. Feynman

" Einstein's gravitational theory, which is said to be the greatest single achievement of theoretical physics, resulted in beautiful relations connecting gravitational phenomena with the geometry of space; this was an exciting idea. "

Richard P. Feynman

" See that the imagination of nature is far, far greater than the imagination of man. "

Richard P. Feynman

" The first amazing fact about gravitation is that the ratio of inertial mass to gravitational mass is constant wherever we have checked it. The second amazing thing about gravitation is how weak it is. "

Richard P. Feynman

" Gravitation is, so far, not understandable in terms of other phenomena. "

Richard P. Feynman

" For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled. "

Richard P. Feynman

" Once I get on a puzzle, I can't get off. "

Richard P. Feynman

" You're unlikely to discover something new without a lot of practice on old stuff, but further, you should get a heck of a lot of fun out of working out funny relations and interesting things. "

Richard P. Feynman

" I don't know what's the matter with people: they don't learn by understanding; they learn by some other way - by rote, or something. Their knowledge is so fragile! "

Richard P. Feynman

" The ideas associated with the problems of the development of science, as far as I can see by looking around me, are not of the kind that everyone appreciates. "

Richard P. Feynman

" I believe that a scientist looking at nonscientific problems is just as dumb as the next guy. "

Richard P. Feynman

" It has been discovered that all the world is made of the same atoms, that the stars are of the same stuff as ourselves. It then becomes a question of where our stuff came from. Not just where did life come from, or where did the earth come from, but where did the stuff of life and of the earth come from? "

Richard P. Feynman

" I got a fancy reputation. During high school, every puzzle that was known to man must have come to me. Every damn, crazy conundrum that people had invented, I knew. "

Richard P. Feynman