Hyp(otenuse) to be a Square

Pythagoras was one of the earliest of the Greek philosopher/scientist/mathematicians. In fact, he's said to have coined the term philosopher, from the Greek terms meaning "love of knowledge." Partly due to the natural effects of historical perspective, and partly due to the secrecy maintained by the cult of Pythagoreans, not much is known with certainty about him or his works.

He's best known for the theorem about right triangles that bears his name, though he probably didn't originate it. Also up there is his work on producing tones with strings of various lengths and tensions.

So next time you're playing Guitar Hero, think of Pythagoras.