I believed until college (I guess I just didn't think about it) that women had one more rib than men. I thought that it explained the whole Adam and Eve thing.
A childhood belief about general

others believed things like this
- I used to believe that in China, instead of Adam and Eve eating an apple? They believed it was a banana.— smartygirl
- When I first met my husband, he thought women didn't fart. He was really surprised after he met me!!!Anon
- I thought that wars had to last four years... just like high school and college.— A. Falk
- when i was young i believed that gay men got married to gay women!— robster
- I once asked my dad 'when you were little were you in black and white?'
So I guess I believed that lol XD— Moo - I didn't understand about boiled eggs until my Mum explained I wasn't supposed to eat the shell as well.— Chris