I used to think that it was only weak lasers that just made a dot of light. I thought that with Reaaly powerful ones, you could see the lazer beam. Then i was told that the readon you could see the beam sometimes was that the test room was full of dust!
A childhood belief about technology

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 believe that brown cows reaaly gave chocolate milk. — Michael Pacitti
- Before I went to a planetarium for the first time, I thought it was just a room full of plants. Anon
- i believed that if you farted too much in a room and you were to light a flame your house would blow up— the nuclear fart
- When I was a child, I used to believe that my dad was the most powerful and strong man on earth. — LM
- I thought a major general is more powerful than just a general (which still kind of makes sense to me)— Demond