Retrocodex

Put in your birth year, see everything you were (probably) taught that was wrong. I learned that if you throw a penny off the top of the Empire State Building it will not kill anyone because pennies are too light and flat to reach a lethal velocity.

From the site:

“Browse and discuss 100+ commonly taught disproven, outdated facts with sources. Follow other users from your same state or country to see what teachers and parents from your region got wrong growing up.”