It doesn't matter how beautiful your theory is, it doesn't matter how smart you are. If it doesn't agree with experiment, it's wrong.

It is in the admission of ignorance and the admission of uncertainty that there is a hope for the continuous motion of human beings in some direction that does…

Mathematics is not real, but it feels real. Where is this place?

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

There never comes a point where a theory can be said to be true. The most that one can claim for any theory is that it has shared the successes of all its riva…

'We have to learn again that science without contact with experiments is an enterprise which is likely to go completely astray into imaginary conjecture.'

...when the experiment was attempted by Michelson and Morley it failed, thus showing that space and time assumed in the picture were not true to the facts of n…