The simplest questions are often the best. Robert P Crease tries to answer one from a physics student in Kenya Seeking perfection Tennis balls are a low-cost way to explore simple physics concepts, ...

Everyone needs some “go to” demos. Personally, I like this one. It’s not too difficult to build and it’s easy to use. Take a large block of wood (it needs to have a good mass). I used a left over ...

Materials Needed: a piece of flannel which is clean and dry or paper towel, stream of water, flexible plastic ruler and a party balloon. In order for the stream of water to flow out, you need to open ...

Do not try this at home without a supervision of an adult. Materials Needed: Aluminum can, some tap water, stovetop burner, one oven mitt and a bowl of cold water. The first step is to make sure you ...