Founder of Bridgewater, one of the world's biggest hedge funds. He spied the dotcom bubble early, warning in 1995 that America was "approaching a blow-off phase" in stocks—five years before the NASDAQ peaked in March 2000 and fell by more than 80%.
For animals, the entire universe has been neatly divided into things to (a) mate with, (b) eat, (c) run away from, and (d) rocks.