In a world where prodigious sports talents tend to forgo higher education altogether for the pros, Tiger Woods chose to continue playing amateur golf at Stanford University as an economics major. Perhaps it was in Econ 101 that he learned the term "opportunity cost," because his time at Stanford was not long. After two years there, Woods turned pro with his "Hello world" announcement, officially ending his collegiate career. He would go on to become one of the highest paid athletes in the world, earning more than $100 million annually at the height of his career. How's that for economics?