I used to believe that telegraphs worked by pulling on a cable and the person on the other end would be able to feel when it was pulled. I figured that to send a message a really long distance you had to pull really hard, but could never work out how someone would have enough strength to pull the cable hard enough to send a message overseas.
A childhood belief about technology

others believed things like this
- when i was abotu 5 or 6 i thought that if i were to pull hard enough on my pants, i would float away— Aaron
- Living near Canada's border without cable, I didn't know I was American. — Romania
- i used to believe that if i didn't work at school, i would have donkey ears, so now i work hard !!!— denis
- i beleived that once the tiolet was a big dinosaur and if i sat on it, it would eat my bum and send me to jailAnon
- i always wondered why people sent plums to the queen, in the anthem "send her victorias"— anon uk
- When i was little, I used to send Jesus birthday cards on christmas and thought he would read them in heaven.Anon