Our Pi Approximation T-shirt sale ends tonight, so hurry to our store to pick up any of our great T-shirts for only $14.99 each!

Need some help deciding which shirt to get? Here are our 12 most popular math and science T-shirts:

1. I'm No Rocket Surgeon

2. Pluto: Revolve in Peace

3. Heavy Metals

4. There's No Right Way to Eat a Rhesus

5. I Heart Math

6. Simple as 3.141592...

7. Fibonacci

8. Asymptotic High Fives

9. Pavlov

10. Exponents

11. Quantum Mechanics

12. Don't Derive Drunk