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When I was four or five I recall my dad telling me that it was possible to stop time. He's an amatuer physicist, so I'm sure he was just trying to explain some principle that I was too young to understand. The thing is, I have a very distinct memory of him demonstrating this ability. I was able to pluck a "frozen" bumblebee right out of the air and put it in a jar.
I used to believe that because of the damage it does, UV light' was 'ultra violent light' not 'ultra violet'.
I had heard something about a mirror being a piece of glass with black behind it. So I found some black paper and a piece of glass, and I was very disapointed...
When I was in grade school I was convinced by another student that you could make a laser by placing a flashlight inside a drinking glass and angling it just the right way. I tried this at home and was delighted when I saw some light rays come out of the glass at weird angles. I thought for sure I had made my own homemade laser beam!
When I was a little girl I knew that the earth rotated on it's axis. I thought that the earth made a complete turn every day and that while it was turning everything was upside down ! Since this didn't happen during the day I would try to stay awake all night long hoping to see everything upside down. When I would wake in the morning I'd be very disappointed because I missed it !
When I was a child, I used to believe that the force of gravity was an old woman named "Marialonga" sucking down children with her hands.
I teach 8th grade. Many of my students have been amazed to learn recently that our Galaxy is called the Milky Way, that this isn't the only galaxy, that our sun is not at the center of our galaxy, and that no people or even space probes have left our galaxy. I especially love to watch their faces when I show them a picture of the Hubble Deep Field North and say that every point of light in the picture is a galaxy, then explain just how small an amount of the sky that the picture covers.
The German word for x-rays is Röntgen-Strahlen, so I used to believe it must be an amazing coincidence that the man who discovered them bore the name of Röntgen.
I used to believe that sonic booms were huge explosions that only occured at the very tops of mountains.
When I was Younger I used to believe that if I talked into a jar and then covered the top... I could hear myself when I opened the jar
Up until about 14 years old, I never believed that a knife totally cut anything in half. I always thought there was a tiny sliver that got pushed down directly under the blade that was so small it was not visible to the human eye.
I used to believe that if I jumped from a height and I had my legs crossed I wouldn't break my legs and I would land unharmed.
When I was young, I believed that when I was walking or riding my bike, I was staying still and that my motion was making the earth revolve!
I used to believe that electricity was these little soldiers on horses charging in a straight line out of the socket. I knew I shouldn't get close or touch a electric socket and I thought if I did these guys would come out and hurt me.
When I was in grade school (I schooled in Canada), I held the belief that during Winter the world was cold because the world was covered in snow. As you could see manhole covers and vents that had melted snow around it, they were direct links to underground, my premise was that heat actually came through the center of the earth (remember those nifty schoolbooks with the picture of the core of molten hot metal) and snow was actually blocking the heat coming into the air. This was also confirmed by it not being cold in the house, as the floor of the house didn't have any snow on it.
I used to believe that the world was actually flat, and that we were at the bottom of the universe, with the sun and moon, and all the stars floating up above us.
I thought that the universe was in the shape of a pyramid and our solar system was somewhere on the south side of it (yes I know there's no south in space but I didn't as a kid!)
When I was small I had a toy measuring tape that marked every centimeter (about 0.4 inches). I came to the conclusion that a centimeter is the smallest unit of length. So when something was, let's say, 0.5 centimeters long, I though it's either a measurement error or a pure illusion.
When i was little i use to think that if you jumped from a high roof, and had a little step 1 feet from the ground, you wouldn't get hurt because from the distance from the step to the ground was so little.. but later on i changed my mind because i got to think about the distance from the roof to the step.. but it was some really exiting hours of that belief
As a child I used to spin myself around and around. When I'd stand still after spinning the room would be moving around and I was convinced that I was witnessing the earth rotating on its axis.