Erdos owed his phenomenal stamina to amphetamines—he took ten to twenty milligrams of Benzedrine or Ritalin daily. Worried about his drug use, a friend once bet Erdoos that he wouldn’t be able to give up amphetamines for a month. Erdos took the bet and succeeded in going cold turkey for thirty days. When he came to collect his money, he told his friend, “You’ve showed me I’m not an addict. But I didn’t get any work done. I’d get up in the morning and stare at a blank piece of paper. I’d have no ideas, just like an ordinary person. You’ve set mathematics back a month.” After the bet, Erdos
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