This intriguing t-shirt pictures the Euclidian 5th postulate. Even if you don’t know what that means, people might think you’re smarter than you look if you wear this “Here’s Lookin at Euclid,” T-shirt. Just memorize these words “Euclid postulated that two angles, alpha and beta, sum to less than pi radians, would eventually cross the same point on a line.” And even if you still don’t understand what that means, just recite those words and people will applaud at the apparent size of your brain. This T-shirt is 100% cotton and is available in adult sizes S-XXL. These t-shirts tend to run a bit small, so if you’re on the fence, order up!