I was convinced that I could invent a machine that would pressurize wood, but denying it oxygen, it would not burn, but melt. I'm still not convinced it's impossible. :-)
A childhood belief about chemistry

others believed things like this
- a friend was convinced that his school was an asylum, and couldn't be convinced otherwiseAnon
- I thought that when I got older "they" would invent a cure for death and I could live forever.— wishful thinking
- i used to believe that our ansering machine was the washing machine and that it could talk
— tamara - I used to think that oxymoron had something to do with oxygen...Anon
- When I got my feet measured by the electronic machine, I thought that the machine will squash my feet!— Helen
- The bus needed coins to run; it would melt them down and use them as fuelAnon