I used to believe that all the specks of dust that you see flying around in the air (like when looking across a beam of light inside your house) was the "air".
A childhood belief about physics

others believed things like this
- I used to think that if you shone a flashlight beam onto a lightbulb long enough, it would eventually light.— Karen K
- I used to think that when somebody farted, little black dots came out that looked like pepper specks.— Jade
- I used to believe there was a newsreader inside the radio where the light was!!— Christine
- I used to believe that if you opened up an umbrella inside your house that the whole house would fly awayAnon
- When i was little i always thought there were little men inside the traffic lights changing the light— Kiley
- I used to beleive that little drawf men were inside each traffic light, making them change colors. — alisha