When I was in secondary school I learned about Van de Graaff. What I know about Van de Graaff is a metal sphere that make someone’s hair stand on and the sphere is known as Van de Graaff generator.
This magic wand was created based on the theory of Van de Graaff. This battery powered wand features a mini Van de ...More Info
Back to medieval, folk are use trebuchets and catapults to attack a castle. Nowadays, we can only see this weapons in movies, till I saw this gadget.
This Wooden War Engine Kits is a little trebuchet that let you throw balls of paper and other small objects over cubicle walls. There are currently two kits available, one for making a trebuchet ...More Info
