An exclusive from the Father of SETI! Physicist Phillip Morrison called the Drake Equation “The second most famous equation in the world.” The front of the shirt displays the SETI logo, and the famous equation (N=R* fp ne fl fi fc L) is printed on the back. Dazzle your friends with your scientific prowess as you define the equation for them! To find out what is considered the most famous equation, see our Book list for Everything Einstein.