It may be too early in the day, but if you are any good at maths or gambling try this quiz that is on Bloomberg.
Proposition bets (unique wagers on a specific outcome):
How many people do you need to have in a room for there to be a 50 percent chance that two of them have the same birthday?
a) 23 b) 37 c) 52
Thanks to Paul Kedrosky for the spot.