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"Another most interesting change in the ideas and philosophy of science
brought about by quantum mechanics is this: it is not possible to predict exactly
what will happen in any circumstance. For example, it is possible to arrange an
atom which is ready to emit light, and we can measure when it has emitted light
by picking up a photon particle, which we shall describe shortly. We cannot,
however, predict when it is going to emit the light or, with several atoms, which
one is going to. You may say that this is because there are some internal "wheels"
which we have not looked at closely enough. No, there are no internal wheels;
nature, as we understand it today, behaves in such a way that it is fundamentally
impossible to make a precise prediction of exactly what will happen in a given
experiment."
About Richard Feynman
Richard Phillips Feynman (May 11, 1918 – February 15, 1988) was an American theoretical physicist. He is known for the work he did in the path integral formulation of quantum mechanics, the theory of quantum electrodynamics, the physics of the superfluidity of supercooled liquid helium, and in particle physics, for which he proposed the parton model. For his contributions to the development of quantum electrodynamics, Feynman received the Nobel Prize in Physics in 1965 jointly with Julian Schwinger and Shin'ichirō Tomonaga. Feynman developed a widely used pictorial representation scheme for the mathematical expressions describing the behavior of subatomic particles, which later became known as Feynman diagrams. During his lifetime, Feynman became one of the best-known scientists in the world.
Biography information from Wikiquote
Additional quotes by Richard Feynman
First figure out why you want the students to learn the subject and what you want them to know, and the method will result more or less by common sense.
Every object is a mixture of lots of things, so we can deal with it only as a series of approximations and idealizations.
The real problem in speech is not precise language. The problem is clear language. The desire is to have the idea clearly communicated to the other person. It is only necessary to be precise when there is some doubt as to the meaning of a phrase, and then the precision should be put in the place where the doubt exists. It is really quite impossible to say anything with absolute precision, unless that thing is so abstracted from the real world as to not represent any real thing.