Love those videos by Vi Hart. We also love this guy Pythagoras. But do we really know him? There are two great reads that claims that this guy plagiarized the an African Theorem and flipped it as the Pythagoras Theorem.
1. “Stolen Legacy” by George GM James
2. “Civilization or Barbarism” by Cheik Anta Diop.
If you really want to get weirded-out, do some research on his cult following.