Richard Feynman citáty

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Einstein was a genius: Head in the clouds, feet on the ground. But those of us who are not as tall, have to make a choice.
Prisudzované výroky

God was invented to explain mystery. God is always invented to explain those things that you do not understand.
Citácia v: Superstrings: A Theory of Everything? (1988) autor: Paul C. W. Davies; autor: Julian R. Brown, str. 208-209, ISBN 0521354625
Potvrdené výroky

There are 1011 stars in the galaxy. That used to be a huge number. But it's only a hundred billion. It's less than the national deficit! We used to call them astronomical numbers. Now we should call them economical numbers.
Prisudzované výroky

Physics is like sex. Sure, it may give some practical results, but that's not why we do it.
Prisudzované výroky

Does not appear to be from any of his books or cited in a biography. A Google Books search shows that the oldest book citing "physics is like sex" is Scary Monsters and Bright Ideas (2000) by science broadcaster Robyn Williams. On p. 44, this book claims: "Einstein said, 'You do not really understand something unless you can explain it to your grandmother'. Richard Feynman added, 'Physics is like sex: sure, it may give some practical results, but that's not why we do it'." Given that Einstein didn't really say the former, it's likely that Feynman didn't really say the latter.
Disputed and/or attributed
Varianta: Physics is like sex: sure, it may give some practical results, but that's not why we do it.

volume II; lecture 2, "Differential Calculus of Vector Fields"; section 2-1, "Understanding physics"; p. 2-1
The Feynman Lectures on Physics (1964)

Zdroj: The Character of Physical Law (1965), chapter 1, “The Law of Gravitation,” p. 34

QED: The Strange Theory of Light and Matter (1985)

same passage in transcript: video http://www.youtube.com/watch?v=-2NnquxdWFk&amp;t=16m46s <br class="br">The Character of Physical Law (1965) <br class="br">Varianta: In general we look for a new law by the following process. First we guess it. Then we compute the consequences of the guess to see what would be implied if this law that we guessed is right. Then we compare the result of the computation to nature, with experiment or experience, compare it directly with observation, to see if it works. If it disagrees with experiment it is wrong. In that simple statement is the key to science. It does not make any difference how beautiful your guess is. It does not make any difference how smart you are, who made the guess, or what his name is – if it disagrees with experiment it is wrong. That is all there is to it.

Varianta: I think I can safely say that nobody understands quantum mechanics.
Zdroj: The Character of Physical Law (1965), chapter 6, “Probability and Uncertainty — the Quantum Mechanical View of Nature,” p. 129

volume II; lecture 26, "Lorentz Transformations of the Fields"; section 26-1, "The four-potential of a moving charge"; p. 26-2
The Feynman Lectures on Physics (1964)

volume III, "Feynman's Epilogue", p. 21-19
The Feynman Lectures on Physics (1964)

Zdroj: QED: The Strange Theory of Light and Matter (1985), p. 24

On the numerical value of α, the fine-structure constant, p. 129
QED: The Strange Theory of Light and Matter (1985)

Zdroj: No Ordinary Genius (1994), p. 239, from interview in &quot;The Pleasure of Finding Things Out&quot; (1981): video http://www.youtube.com/watch?v=NEwUwWh5Xs4&amp;t=48m10s

&quot; Simulating Physics with Computers http://www.cs.berkeley.edu/~christos/classics/Feynman.pdf&quot;, International Journal of Theoretical Physics, volume 21, 1982, p. 467-488, at p. 486 (final words)

from a 1987 class, as quoted in David L. Goodstein, "Richard P. Feynman, Teacher," Physics Today, volume 42, number 2 (February 1989) p. 70-75, at p. 73
Republished in the "Special Preface" to Six Easy Pieces (1995), p. xx.

Zdroj: The Character of Physical Law (1965), chapter 1, “The Law of Gravitation,” p. 18: video http://www.youtube.com/watch?v=j3mhkYbznBk&amp;t=17m10s

Part 1: "From Rockaway to MIT", "String Beans", p. 25
Surely You're Joking, Mr. Feynman! (1985)

&quot;The Development of the Space-Time View of Quantum Electrodynamics,&quot; Nobel Lecture http://nobelprize.org/physics/laureates/1965/feynman-lecture.html (11 December 1965)

rather than with the event
Zdroj: QED: The Strange Theory of Light and Matter (1985), p. 75-76

We haven’t any deep understanding of what we’re doing. If we tried to understand what we’re doing, we’d go nutty. <br class="br">Zdroj: No Ordinary Genius (1994), p. 236, from interview two weeks before his death in &quot;The Quest for Tannu Tuva&quot; (1989): video http://www.youtube.com/watch?v=Mn4_40hAAr0&amp;t=51m49s

lecture II: "The Uncertainty of Values"
The Meaning of It All (1999)

The Value of Science (1955)

Zdroj: The Character of Physical Law (1965), chapter 7, “Seeking New Laws,” p. 168

Probably a misattribution which instead originated with David Mermin; in &quot;Could Feynman Have Said This?&quot; http://scitation.aip.org/journals/doc/PHTOAD-ft/vol_57/iss_5/10_1.shtml?bypassSSO=1, by N. David Mermin, in Physics Today (May 2004), p. 10, he notes that in an earlier Physics Today (April 1989), p. 9, he had written what appears to be the earliest occurrence of the phrase:<br>If I were forced to sum up in one sentence what the Copenhagen interpretation says to me, it would be &quot;Shut up and calculate!&quot; <br class="br">Disputed and/or attributed

note (c. 1948), quoted in Genius: The Life and Science of Richard Feynman (1992) by James Gleick, p. 5 (repeated p. 283)

Zdroj: QED: The Strange Theory of Light and Matter (1985), p. 14

volume I; lecture 44, "The Laws of Thermodynamics"; section 44-1, "Heat engines; the first law"; p. 44-2
The Feynman Lectures on Physics (1964)

From Omni interview, "The Smartest Man in the World" (1979) p. 203
The Pleasure of Finding Things Out (1999)

Zdroj: The Character of Physical Law (1965), chapter 7, “Seeking New Laws,” p. 162: video http://www.youtube.com/watch?v=-2NnquxdWFk&amp;t=29m20s

Part 4: "From Cornell to Caltech, With a Touch of Brazil", "Any Questions?", p. 177
Surely You're Joking, Mr. Feynman! (1985)

Part 1: "From Rockaway to MIT", "Who Stole the Door?", p. 36-37
Surely You're Joking, Mr. Feynman! (1985)