I used to think that pneumonia and ammonia were the same thing. When my friend's mother was using a sink full of ammonia to clean some old combs, I thought we were all going to catch "ammonia".
A childhood belief about chemistry

others believed things like this
- I used to believe waffles were honey combs and thats why you would pour honey on it — Gaby
- I used to believe that you could catch AIDS from just looking at a nud girl. Good thing I was WRONG— Mbm4615
- If you eat 30 minutes before swimming, you will sink.Anon
- i used to believe that a monster lived in the garbage disposal. i would never go near the sink— Whitney
- When I was a little I thought TV was full of tiny books and we would watch one every day— Amine
- Before I went to a planetarium for the first time, I thought it was just a room full of plants. Anon