Quote

Unless a thing can be defined by measurement, it has no place in a theory. And since an accurate value of the momentum of a localized particle cannot be defined by measurement it therefore has no place in the theory.

Richard P. Feynman

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Richard P. Feynman
Age: 69 †
Born: 1918
Born: May 11
Died: 1988
Died: February 15
Inventor
Percussionist
Physicist
Politician
Quantum Physicist
Science Communicator
Theoretical Physicist
University Teacher
Writer
Far Rockaway
New York
Richard Phillips Feynman
Richard P. Feynman
Ofey
Since
Particles
Values
Momentum
Science
Accurate
Place
Defined
Cannot
Therefore
Localized
Thing
Value
Particle
Unless
Measurement
Theory
Mechanic

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Nature does not care what we call it, she just keeps on doing it.
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Therefore psychologically we must keep all the theories in our heads, and every theoretical physicist who is any good knows six or seven different theoretical representations for exactly the same physics.
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When things are going well, something will go wrong. / When things just can't get any worse, they will. / Anytime things appear to be going better, you have overlooked something.
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If all of mathematics disappeared, physics would be set back by exactly one week.
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Mathematics is a language plus reasoning. It's like a language plus logic. Mathematics is a tool for reasoning.
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I have the advantage of having found out how hard it is to get to really know something. How careful you have to be about checking your experiments. How easy it is to make mistakes and fool yourself. I know what it means to know something.
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I learned very early the difference between knowing the name of something and knowing something.
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Science alone of all the subjects contains within itself the lesson of the danger of belief in the infallibility of the greatest teachers of the preceding generation.
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To those who do not know mathematics it is difficult to get across a real feeling as to the beauty, the deepest beauty, of nature ... If you want to learn about nature, to appreciate nature, it is necessary to understand the language that she speaks in.
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If we will only allow that, as we progress, we remain unsure, we will leave opportunities for alternatives.
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The first principle is that you must not fool yourself and you are the easiest person to fool.
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No one really understands quantum mechanics.
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You do not know anything until you have practiced.
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Energy is a very subtle concept. It is very, very difficult to get right.
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Work hard to find something that fascinates you.
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The Quantum Universe has a quotation from me in every chapter - but it's a damn good book anyway.
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