What's the dumbest thing you thought as an adult that you recently learned was wrong?
I just realized while cooking that a measuring-cup cup (as measured out as 250mL in a glass measuring cup) is the same amount(s) as one of the actual plastic baking measuring cups that go inside each other like Russian dolls lol
I thought they were different somehow (something something imperial metric yadda yadda yaddda)
Your turn to come clean Lemmings!
**EDIT: to clarify, I mean volumetrically for measuring liquids
I highly disagree. There are bad people, and there are good organizations. Groups of people can act dumber, and it's easier for the bad ones to gain control, but it's not like once you gather a few dozen people around they suddenly go from angels to evil.