"For John Urschel, what began as an insatiable appetite for puzzles as a child quickly evolved into mastery of the elegant systems and rules of mathematics. By the time he was thirteen, Urschel was auditing college-level calculus courses. But when he joined his high school football team, a new interest began to eclipse the thrill he once felt in the classroom. Football challenged Urschel in an entirely different way, and he became addicted to the...