A successful Wall Street trader-turned-Cambridge neuroscientist reveals the biology of financial boom and bust, showing how risk-taking transforms our body chemistry, driving us to extremes of euphoria or stressed-out depression. The laws of financial boom and bust, it turns out, have a lot to do with male hormones. Canadian scientist Dr John Coates indentifies the loop between testosterone and success that dramatically lowers the fear of risk in men. He has dubbed the moment when traders transform into exuberant high flyers "the hour between dog and wolf". This is a fascinating account of his hypothesis.