The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.

I wonder why. I wonder why. I wonder why I wonder.

[Quantum mechanics] describes nature as absurd from the point of view of common sense. And yet it fully agrees with experiment. So I hope you can accept nature as She is - absurd.

All the time you're saying to yourself, 'I could do that, but I won't,'--which is just another way of saying that you can't.

The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.

You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird... So let's look at the bird and see what it's doing -- that's what counts.

We scientists are clever — too clever — are you not satisfied? Is four square miles in one bomb not enough? Men are still thinking. Just tell us how big you want it!