Boom Stick: The High Powered PVC Air Cannon 11/20/2015 A boom stick is the perfect jump scare delivery system.
Build a Simple Vortex Cannon, Then Upgrade with a Subwoofer 11/19/2015 Learn about the physics of air movement with a vortex cannon that blows smoke rings when you thump it.
Chladni Plate 12/18/2012 Use a broken speaker, bits of wire, and tape to prepare a coneless voice coil driver, then use it to...
1+2+3: Ping Ponger 10/26/2010 Almost half of a rubber racquetball is used as a disc spring that's bistable to propel a ping-pong ball from...
