Math T-Shirt Friday

On Friday, teachers at our school can "dress down" and wear jeans. I have used this opportunity to also wear Math T-Shirts.  Over the last several years I have been collecting T-shirts that have a math theme and my goal is to have 40+ T-shirts so that I can wear a different one every week! Some of my favorite shirts came from Woot.com and Savers (thrift shop) and CafePress.