About 25 years ago, trading guru Richard Dennis reportedly said to his long-time friend William Eckhardt, a friend and fellow trader. Dennis believed that successful trading could be taught. This started a bet between them about whether great traders were born or made. To settle this debate, Dennis recruited and trained 21 men and 2 women, and this became a legendary trading experiment.Dennis trained his Turtles, as he called them, for only two weeks. Then he gave each of them a million dollars of his own money to manage, and turned each one loose on the markets. When his experiment ended five years later, his Turtles reportedly had earned an...