7 robots too expensive (or lethal) to own

If the captain of the Enterprise orders you to sickbay, you'll want the Xenex there.

Once it's turned on remotely, the robot lifts its head and bathes the empty hospital room in ultraviolet light, disinfecting everything in sight.

Xenex, the eponymous company that created the robot, made it easy to use. Hospital housekeepers just have to wheel it in, turn it on, then leave the room for a few minutes.

Technically speaking, anyone can buy this robot. But it's geared toward hospitals. The company requires you to take a certification course and costs $125,000. Xenex claims it pays for itself: a North Carolina hospital saved $2.3 million in six months by preventing several nasty MRSA infections.