I always thought that Marie Curie was so called because she invented the Cure for Cancer. It never crossed my mind that she would have always had that name, and only later in life would have started finding cures for things.
A childhood belief about physics

others believed things like this
- I used to think the ottoman was called the "autumin" because it was invented in autumn. I Anon
- I thought that when I got older "they" would invent a cure for death and I could live forever.— wishful thinking
- I used to want to be a doctor when I grew up, because doctors never die, as they can cure themselves.— Stuart
- I used to believe that when we left a room the TV set started to speak about other things — Nur
- I thought you always die if you A. get cancer or B. have a heart attack— Nate
- when i was little i thought people with big heads or big noses had cancer...Anon