I used to believe that if everyone would walk in the same direction at the same time we could make the earth's spin reverse. I never could get everyone to do this, so I still believe it (at least a little) and I have a MS in geology.
A childhood belief about physics

others believed things like this
- I used to believe that aeroplanes could reverse when they are flying. Anon
- When I was about 5, I thought that English was the reverse reading of Turkish.— sel
- I used to think dogs had hooves, because they make hoofbeat-like sounds when they walk.— Samuel Lamont
- I used to think that if I ate a Wunderbar chocolate bar, I could spin around and become Wonder Woman. — Miss Naive
- I used to think the song "Walk this way" by Arosmith went horse and sleigh insted of singing walk this way.— Derek
- I used to believe the tv serie "Doctor Who" was a spin off from James Bond... (until I saw an episode)Anon