The Pythagoreans believed that numbers were the ultimate reality, but they considered 5 as unlucky?

This is one of more than 30,000 trivia questions from the Quizburst archive. Every entry has been written by hand for the FactCheck Daily and Guess The Year video channels and is now playable as an endless mobile game.

If you want to see if you can run a streak across questions like this one, the live game is mobile-first and free — no login, no signup. Pick a username and start tapping.