If we see green apples fall from a tree every day, why should we reason inductively and conclude that every apple that falls from the tree will be green? Why not conclude instead that the next apple to fall from the tree will be red?

# Is Everything Mathematics?

One of the most puzzling mysteries of modern day Physics is why mathematics is such a useful tool for uncovering the workings of the universe. Although mathematics has always been the only acceptable language in which to phrase serious physics, letting mathematics guide the direction of physics is a late 20th/21st century revolution in scientific thinking.

# Universes of Another Kind

There are other kinds of multiverse that physicists discuss, but there's an entirely different kind of multiverse that is discussed by philosophers, not physicists. This is the multiverse of "possible worlds", and was introduced as a semantics that made modal statements much easier to analyse.