A successful Wall Street trader turned neuroscientist reveals how risk taking and stress transform our body chemistry Before he became a world-class scientist, John Coates ran a derivatives trading desk in New York City. He used the expression "the hour between dog and wolf" to refer to the moment of Jekyll-and-Hyde transformation traders passed through when under pressure. They became cocky and irrationally risk- seeking when on a winning streak, tentative and risk-averse when cowering from losses. In a series of groundbreaking experiments, Coates identified a feedback loop between testosterone and success--one that can cloud men's judgment in high-pressure decision-making. Coates demonstrates how our bodies produce the fabled gut feelings we