I used to believe that I invented the X Y coordinate system.
A childhood belief about physics

others believed things like this
- I used to believe GPS stood for Ginormous Processing System. — Babre
- when I was small I always thought that the solar system ended, and then it was just white paper after that— sparrow
- When I was younger, my brother told me the police had an infra-red system and could see into everyones house.— Clare, Ireland
- I used to believe that I actually invented the word "excellent".— poop jacket
- I believed that I had invented reef knots.— Phil
- I thought Napoleon invented linoleum.— Steve Murphy