Feynman qed pdf download

After 25 years it is the guide for teachers and for the best of beginning students. He also authored a number of advanced publications that have become classic references and textbooks for researchers and students. Richard Feynman was a constructive public man. His work on the Challenger commission is well known, especially his famous demonstration of the susceptibility of the O-rings to cold, an elegant experiment that required nothing more than a glass of ice water and a C-clamp.

Less well known were Dr. Besides being a physicist, he was at various times a repairer of radios, a picker of locks, an artist, a dancer, a bongo player, and even a decipherer of Mayan Hieroglyphics. Perpetually curious about his world, he was an exemplary empiricist. We just put those materials which are accessible on the web.

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Must read post for fixing links. Richard Feynman died on February 15, , in Los Angeles. Feynman lectures pdf Download Feynman Lectures.

Still the rats could tell. Then he thought maybe they were smelling the food, so he used chemicals to change the smell after each run. Then he realized the rats might be able to tell by seeing the lights and the arrangement in the laboratory like any commonsense person.

So he covered the corridor, and still the rats could tell. He finally found that they could tell by the way the floor sounded when they ran over it.

And he could only fix that by putting his corridor in sand. So he covered one after another of all possible clues and finally was able to fool the rats so that they had to learn to go to the third door. If he relaxed any of his conditions, the rats could tell.

Now, from a scientific standpoint, that is an A-number-one experiment. That is the experiment that makes rat-running experiments sensible, because it uncovers the clues that the rat is really using — not what you think it's using. And that is the experiment that tells exactly what conditions you have to use in order to be careful and control everything in an experiment with rat-running.

I looked into the subsequent history of this research. The next experiment, and the one after that, never referred to Mr. They never used any of his criteria of putting the corridor on sand, or of being very careful. They just went right on running rats in the same old way, and paid no attention to the great discoveries of Mr.

Young, and his papers are not referred to, because he didn't discover anything about rats. In fact, he discovered all the things you have to do to discover something about rats. But not paying attention to experiments like that is a characteristic of cargo cult science. I learned a way of expressing this common human problem on a trip to Honolulu. In a Buddhist temple there, the man in charge explained a little bit about the Buddhist religion for tourists, and then ended his talk by telling them he had something to say to them that they would never forget — and I have never forgotten it.

It was a proverb of the Buddhist religion:. To every man is given the key to the gates of heaven; the same key opens the gates of hell. What then, is the value of the key to heaven? It is true that if we lack clear instructions that enable us to determine which is the gate to heaven and which the gate to hell, the key may be a dangerous object to use. Ages on ages before any eyes could see year after year thunderously pounding the shore as now.

For whom, for what? On a dead planet with no life to entertain. Never at rest tortured by energy wasted prodigiously by the sun poured into space. A mite makes the sea roar. Deep in the sea all molecules repeat the patterns of one another till complex new ones are formed. They make others like themselves and a new dance starts.

Growing in size and complexity living things masses of atoms DNA, protein dancing a pattern ever more intricate. Out of the cradle onto dry land here it is standing: atoms with consciousness; matter with curiosity. Stands at the sea, wonders at wondering: I a universe of atoms an atom in the universe. Now, we scientists are used to this, and we take it for granted that it is perfectly consistent to be unsure, that it is possible to live and not know.

But I don't know whether everyone realizes this is true. Our freedom to doubt was born out of a struggle against authority in the early days of science. It was a very deep and strong struggle: permit us to question — to doubt — to not be sure. I think that it is important that we do not forget this struggle and thus perhaps lose what we have gained.

But, fortunately, it's been useless for almost forty years now, hasn't it? So I've been wrong about it being useless making bridges and I'm glad those other people had the sense to go ahead.