A belief from childhood that remained with me until an embarassingly late age, was that the jet stream, that all powerful influence on temperate and arctic weather, was caused by jets whooshing around the planet on intercontinental flights at high altitude.
A childhood belief about weather

others believed things like this
- I used to think that girls' anuses were green. I remember thinking that as late as high school.— Jack
- I used to belief sloths lived in trees outside my childhood home. My older sister told me so.Anon
- I thought weather forecasters were psychic and that's how they knew what the weather would be.Anon
- I used to believe clouds were formed by jets and their exhaust. — Olivia
- I used to believe that the streams left behind jets were people going to heaven.— kindofadork
- When I was younger I thought that the jets that leave lines in the sky were rockets — Harry