The joke among young men these days is that everybody’s got a little money riding on something: football games, foreign elections, the odds of a U.S. military strike. Except it’s not really a joke. I recently made $3.79 guessing when the United States would attack Tehran. I pocketed $0.85 when To Lam was re-elected general secretary of the Communist Party of Vietnam. I took home $83.64 after the rock climber Alex Honnold successfully climbed the skyscraper Taipei 101 without a rope. My wagers