Here on Hackaday, [Caleb] built a Portal gun which levitated a Companion Cube. Rather than go the magnetic route, [Jacob] levitated a ping-pong ball on a cushion of air. Now, it would be ...

Next time you’re in a Nerf gun battle, you better hope you’ve got this absurdly powerful ping pong ball gun. It shoots common celluloid spheres at over 400 meters per second, or Mach 1.2. This ...

Using a ping pong ball as the base, stretch rubber bands across it to build it ... Once the balls are dry, use a hot glue gun to attach them to the frame. The balls can extend past the frame ...