Robert Krampf’s Experiment of the Week:  THE BULLROARER This week’s experiment is an old one, but a fun one. The basic concept of the Bullroarer can be found in the distant history of Europe, Asia, Africa, the Americas, and Australia. While it is traditionally made of a flat piece of wood, this version is very quick, easy to make, and produces a similar sound. To try it, you will need: a plastic… Read More