Progress is made by lazy men looking for easier ways to do things.

Customs tell a man who he is, where he belongs, what he must do. Better illogical customs than none; men cannot live together without them. From an anthropologist's view, 'justice' is a search for workable customs.

Many older physicians had gone to their graves calling Pasteur a liar, a fool, or worse---and without examining evidence which their “common sense” told them was impossible.

To die trying is the proudest humans thing.

When you read about chemistry and physics, you want to do them too.

You can't believe what a lovely planet we have until you see her from outside.