My kids classroom of about 25 kids had their birthdays on the wall. Before I looked I thought "yeah good chance 2 are on the same day". And indeed 2 kids shared

My kids classroom of about 25 kids had their birthdays on the wall. Before I looked I thought "yeah good chance 2 are on the same day". And indeed 2 kids shared the same birthday :-). How much surprise? Not a lot (when measured in bits).