Would I lay down my life to save my brother? No, but I would to save two brothers or eight cousins.

Science is vastly more stimulating to the imagination than the classics.

It was a reaction from the old idea of "protoplasm", a name which was a mere repository of ignorance.

You can drop a mouse down a thousand-yard mine shaft and, on arriving at the bottom, it gets a slight shock and walks away. A rat would probably be killed, though it can fall safely from the eleventh story of a building, a man is broken, a horse splashes.

Money can buy a fine dog but it is kindness that makes him wag his tail.

Until politics are a branch of science, we shall do well to regard political and social reforms as experiments rather than short-cuts to the millennium.

Reality is the cage of those who lack imagination.