The technologies which have had the most profound effects on human life are usually simple.

The world is just - it's wonderful when you look at all the detail. It's just amazing.

Dropping of the atomic bomb was the main subject of conversation for many years and so people had very strong feelings about it on both sides and people who thought it was the greatest thing they'd ever done and people who thought it was just an unpleasant job and people who thought they should have never done it at all, so there were opinions of all kinds.

[John Wheeler] rejuvenated general relativity; he made it an experimental subject and took it away from the mathematicians

It is characteristic of all deep human problems that they are not to be approached without some humor and some bewilderment.

For any speculation which does not at first glance look crazy, there is no hope.

There is no way to find the best design except to try out as many designs as possible and discard the failures.