Does It Work?

Flat-panels were supposed to eliminate the hulking television cabinet. But they are tethered to boxes -- cable tuners, disc players, A/V receivers -- that fill a big piece of furniture. A wireless connection lets you at least stash those peripherals out of the way. We tried out the first two cable-free HD technologies: one that uses radio waves and another that piggybacks on your home's electrical wiring.

THE TECH
To calculate their position, most mice use a red LED or a laser to light up a surface, take thousands of pictures per second of the shadows cast by the surface’s microscopic bumps, and then analyze the differences between shots. But that doesn’t work if there are no bumps, as on glossy tables, or if a jagged surface, like carpet, traps narrow light beams between fibers. So Microsoft’s Explorer moves the camera sensor forward to capture the light reflected by any surface.

Today you can buy a rubber boot or a cellphone with rubber seals to keep water out. But a new treatment called Ion Mask promises to make any gadget or clothing item waterproof and stainproof without changing its appearance.