The Pythagorean brotherhood (try saying that with a mouthful of toast!) were followers of the Ancient Greek mathematician Pythagoras.

They tried to describe the world around them and thought that nature could be explained by numbers and mathematics.

Someone came up with the idea of "unspeakable numbers" (no, they weren't swear words!)

These were numbers that were neither odd nor even and they needed an infinite series of decimals to describe them. (An example of an unspeakable number is the constant pi).

So what did people think of next?

Well, the next person to give it his best shot was Aristotle.

ARISTOTLE

GRAVITY