The Polywhat?! A polymath is not a branch of arithmetic, but a person who has expertise in a large number of subjects. The fact that you are even reading this could mean that you possess the curiosity of a polymath. Or, perhaps you are a young polymath in training.
Polymath symptoms: Ask a lot of questions. Always looking things up. Always bouncing around from one interest to another. Analytical thinker. Either an underachiever or an "overachiever".