We are all familiar with things that our distant ancestors considered true that were later proven to be just myths, mainly because we developed science to explain things. The sun doesn't revolve around the earth, even though it looked that way to ancient people. Illness doesn't happen because the body's humors are out of line- but that was the best explanation they had before germs were discovered.
But the inverse also happens. Many things that ancient folks didn't believe turned out much later to be true! These are things that people couldn't believe because it was so outlandish, or because they didn't trust the source, or because they thought their own ancestors were less capable, or because they lacked context. Chill Dude Explains tells us about eight such "myths" that were eventually proven to be real. It will make you question the things we believe today. As you should.
The last one is so wild, you might want to read more about Heinrich Schliemann.
-via Laughing Squid