Photoelectric light controls are weirder than they seem
16:36
Timer switches: literally just a clock and a switch
24:39
Back-up beepers: Obnoxious, but getting better - and spreading!
19:27
The Invisible HF Antenna
27:59
Bright from the Start: GE's CFL with an incandescent trick up its sleeve
24:56
There are two types of smoke alarm. One of 'em ain't so good.
20:08
DIY Laser Image Projector (100ft+ Range!)
22:45
Retroreflectors; they're everywhere, and they cheat physics (sort of)
12:03