M-theory

M-theory is like a big puzzle. It's a theory about how the tiny pieces that make up our universe fit together. The pieces are called strings and they are so small that you can't see them. M-theory says that all the different strings fit together in a particular way that explains how the universe works. M-theory also explains why things like gravity, energy and matter do what they do. Basically, M-theory helps scientists understand the universe better.