Two wires called "travelers" connect the first switch to the second one. Then power leaves the second switch to go to the light. No matter which switch you flip, the light responds. You may find ...

Levitation is managed by a permanent magnet on the light assembly and an electromagnetic coil hidden on the other side of the top panel for the enclosure. That coil uses 300 meters of 20 AWG wire.

Planning a romantic dinner? The last thing you want to worry about when you're ferrying courses in from the kitchen is tripping over wires. This table lamp bypasses that issue. It runs on ...