The birthday puzzler Given 50 people, what is the likelihood that any 2 of them have the same birthday? Probably much higher than you'd guess...
Let's make a Deal! (or the "Monty Hall" game) Remember the old game show where you were given three doors to choose from? The host would then show you one of the other two doors that wasn't correct, and give you the option of changing your mind. This web site shows why switching is a better decision than sticking with your original choice.
