A great deal more is known than has been proved.

Science is a process for learning about nature in which competing ideas about how the world works are measured against observations.

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

In those days, in Far Rockaway, there was a youth center for Jewish kids at the temple.... Somebody nominated me for president of the youth center. The elders began getting nervous, because I was an avowed atheist by that time.... I thought nature itself was so interesting that I didn't want it distorted like that. And so I gradually came to disbelieve the whole religion.

I think it's much more interesting to live not knowing than to have answers which might be wrong.

If an apple was magnified to the size of the Earth, then the atoms in the apple would be approximately the size of the original apple.

To develop working ideas efficiently, I try to fail as fast as I can.