When I was a kid, I used to think that when I breathed in air, I was breathing in some of the same molecules that had been breathed by famous people in history. Like Moses, Jesus, Einstein. As an adult, I found out that this is actually true; I read a book by Carl Sagan that said that, statistcally speaking, with every breath we breath in some of the air molecules of famous historical figures that have lived and breathed in the past! Who knew?
A childhood belief about history

others believed things like this
- I used to think farts were air you had breathed in and out loads of times and was 'used'Anon
- i used to believe that if you swallowed gum, when you breathed in, your stomach would stick to your back— cope
- I used to believe that if I pumped in my sleep and breathed it in I would turn into a rotting turnip!— Quako
- I thought everyone only had a set number of breaths before they died.
I breathed slowly for a long time.Anon - If you hold your breath and make a wish under a highway tunnel it will come true....I still hold my breath :)— aj
- I used to believe that all famous people knew each other.— Liz