There are two types of people in the world: those who think there are two types of people in the world, and those who don't. When all is said and done, there are a bunch of different ways that the world can be divided into two groups: paper or plastic? chocolate or vanilla? Red Sox or Yankees? Or one of the geekier indices: mouse or keyboard?
There are only 10 types of people in the world: Those who understand binary, and those who don't