Is Your Birthday Common?
If you were born on September 12th, 18th, 25th or 26th, CONGRATULATIONS! You share your special day with a ton of other people! A US grad student used CDC information to create a chart illustrating how popular it is to be born on each day of the year. As one could guess, holiday birthdays aren't so popular.
My birthday is May 9th. I could have told you without this chart that I have a popular birthday because I personally know five other people who share it with me...twin sister included =P