I knew every single country on Earth when I was five. Placed first in a geography bee in eighth grade. Would have gone into state competitions if the way it was handled wasn't so sketchy. By eavesdropping, I overheard that the guy reading questions was the dad of a girl in the competition, and was deliberately giving questions she would know. I spread the word around and it turned into a huge problem, so I didn't bother about going to state.