642 Quotes by Richard P. Feynman

The idea that no one really knew how to run a government led to the idea that we should arrange a system by which new ideas could be developed, tried out, and tossed out if necessary, with more new ideas brought in - a trial and error system.

Some people think Wheeler's gotten crazy in his later years, but he's always been crazy.

Everything is made of atoms.

If you can't explain something to a first year student, then you haven't really understood .

The problem of creating something new, but which is consistent with everything which has been seen before, is one of extreme difficulty.

The fundamental principle of science, the definition almost, is this: the sole test of the validity of any idea is experiment.

We're always, by the way, in fundamental physics, always trying to investigate those things in which we don't understand the conclusions. After we've checked them enough, we're okay.

A great deal more is known than has been proved.

Science is like sex: sometimes something useful comes out, but that is not the reason we are doing it