My dad told me to work out how to achieve perpetual motion and so I used to try and for ages he just said I must be doing it wrong until one day I realised.
A childhood belief about physics

others believed things like this
- i used to believe that stars really were star shaped, i realised at the age of 34 how wrong i was.Anon
- That if you didn't have your seat belt buckled up when the car was in motion, it would crash.— Dave Smith
- We told our little sister that she had a long bushy tail and she fully believed us for ages!!Anon
- Turtles can fly. I believed it for ages.
My turtle got lost or probably died and I was told it flew away.Anon - My uncle once said that elves were really badchildren made to work in santa's work shop— Some guy
- i used to believe that if i didn't work at school, i would have donkey ears, so now i work hard !!!— denis