Nick McGill salvaged this case from a secondhand shop and reengineered it to plug into a PC and make calls over the Internet. He whittled down parts from a computer headset and hot-glued them into the mouthpiece and earpieces. The microphone wires had to be cut, soldered, and heat-shrunk back together.
Details at: instructables.com
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.