An expert project for supergeeks
Cosmic rays sleet through us every day. You know this. And with this (kinda tricky) experiment, you can see them.
Cut out a piece of felt, which can cover the bottom of the vessel. Glue the felt to the bottom with strong glue. Wet the felt through with isopropanol. Pour any surplus liquid onto the baking plate.
Use a large spoon to fill the bowl with dry ice. Make sure that the surface is as level as possible, and place the baking plate on the dry ice, allowing the ice to efficiently cool the plate.
Turn the transparent vessel upside down and place it on the baking plate. Wait a few minutes for the dry ice to cool the baking plate and the air inside the vessel.
Switch off the light in the room and use a flashlight to shine light on the vessel. Watch the vapour right above the plate. After a few minutes, you can see clear traces.