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
My parents told me to always leave the "big mosquito bugs" alone as they eat the little mosquitoes. Then I told everyone to do the same for years. Turns out those "big mosquito bugs" were actually "Crane Fly" and they do not eat mosquitoes....