"I did not imagine that the second half of my life would be spent on efforts to avert a mortal danger to humanity created by science"

"Life is life - whether in a cat, or dog or man. There is no difference there between a cat or a man. The idea of difference is a human conception for man's own advantage"

"Plunge boldly into the thick of life, and seize it where you will, it is always interesting"

"Cats and monkeys; monkeys and cats; all human life is there"

"Telling a teenager the facts of life is like giving a fish a bath"

"It is a useless life that is not consecrated to a great ideal. It is like a stone wasted on the field without becoming a part of any edifice"

"Business is the salt of life"

"As soon as there is life there is danger"

"Democracy is the art and science of running the circus from the monkey cage"

"My one regret in life is that I am not someone else"

"Science never solves a problem without creating ten more"