When John Arnold was a trader, he had a serene -- some would say bloodless -- way of seeing the world. He wanted the truth, the cold, hard truth, and embraced the power of an idea no one else was seeing. Then he bet nearly everything he had on it. In 2006, Arnold’s hedge fund, Centaurus Advisors, took a huge contrarian position on natural gas prices and made a fortune. In 2008, it anticipated the commodities crash. Three years ago, at the tender age of 38, married with three children and $4 billion richer, Arnold shut his fund and decided to spend the rest of his professional life giving away his money as ... (full story)