"When it was suggested that I write a memoir I said, 'I'm not old enough. I'm not distinguished enough.' But I went home and sat down to write, and the material for the book just came flooding into my hands."

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A discussion between Haldane and a friend began to take a predictable turn. The friend said with a sigh, 'It's no use going on. I know what you will say next, and I know what you will do next.' The distinguished scientist promptly sat down on the floor, turned two back somersaults, and returned to his seat. 'There,' he said with a smile. 'That's to prove that you're not always right.'

— John B. S. Haldane