I was asking my mom while helping her load the fireplace why she didn't just grind the wood blocks into sawdust so she didn't have to rearrange and reload the fireplace all the time, just fill it up. She explained that sawdust is combustible and could be dangerous just like how special precautions needed to be taken by people working with flour in plants (factories that manufacture flour). I listened to her whole explanation and responded with... "I never knew that flour grew in plants!" (picturing green house-type plants with cocoons hanging from the leaves filled with flour in large fields)
....So I briefly once believed that flour grew on plants. Sadly, this took place at the age of 21.
A childhood belief about dangerous food

others believed things like this
- I thought plants only grew when people were not looking at them.Anon
- I used to think heirloom plants grew antiques— Honorary intern Hector
- I used to thing power plants were cloud factories. xD xD— Kaitlin
- I used to believe that when people died, they turned brown just like plants do when THEY die.— Joey Schwartzman
- Before I went to a planetarium for the first time, I thought it was just a room full of plants. Anon
- I used to believe that my urine was a super fertilizer - peeing on plants made them grow.— Andrew C