I used to believe that elephants had brains the size of a human thumb and managed to convince many people of this. Later, I saw an elephant brain in a bottle at a musuem, and was shocked to see that it was actually around 4.5 kilograms and therefore much larger than even a human brain.
A childhood belief about general

others believed things like this
- When I first saw a picture of the human anatomy, I thought the brain was really snot.Anon
- when i was little i used to think i was the only human and everyone else were robots trying to act human.— Spikey
- I used to think people were called "human beans".— Dave
- I used to believe that if you used people shampoo on a dog, the dog would turn into a human.Anon
- I used to believe that people who wear glasses did had a second brain!— Onessa
- I used to believe that people's brains differed in colours. I always wanted purple brains for some reason.— Katrina