I used to think that people made paper by cutting trees really really thin through the middle. And I was confused because I didn't know how they made so much paper because only trees with a big enough diameter could be made in the rectangular shape of a piece of paper. And I thought it was so wasteful that people just cut off the circular/round edges of the papers, and I didn't understand why they didn't just make pieces of paper circular so as to save paper.
A childhood belief about plants

others believed things like this
- I was convinced that paper could only be made out of Birch trees (because they had white bark).Anon
- I could NOT understand why, if a pen worked on paper, it couldn't also write in thin air.— Can you guess what it is yet?
- I used to believe fax machines instantly teleported a piece of paper to who ever you wanted. Anon
- I used to believe that house fires were caused by foolish people who put paper on the stove.— C.C.
- when my friend was little, she used to eat paper, thinking it would make her read better.— hehehe
- i believe in the tooth fairy so much that i make paper bags for her!— Monster High girl