when i learned about atoms at a young age, I never really comprehended how small they were. Whenever the sun would gleam off dust particles in the air, I thought what I was seeing were actually atoms, and I thought I must have some special sight super powers since a book I read said atoms were invisible to the naked eye. (I also thought "invisible to the naked eye" meant it was literally invisible unless your eye was 'wearing' special lenses)
A childhood belief about chemistry

others believed things like this
- I thought the white circles you see when looking at a bright window were what atoms of air look like.— H.
- That unicorns were real. They simply had invisible horns that only people with special eyes could see
— Katie - Yesterday I realised that invisible ink doesn`t make me invisible.— Jonathan Eleven years old
- When I was little *I thought that if I dressed in all white I would become invisible.Sadly,I wasn't.XP— Kiki
- I used to believe jaywalking meant walking around naked in public (from naked as a JAY bird...)— Izzi
- I used to believe that when you closed you eyes you were invisible and no-one could see you!— Andrew