While it's not quite x-ray vision (at least, not yet), this sensor is capable of detecting people through solid walls. It's being developed and tested in cooperation with the U.S. Army, in the hopes that technology like this will make it possible for soldiers to get some clues about what's inside a room before they have to go in.

I guess the Navy is too good for Ebay. Instead, the US aquatic fighting force is trying to find a new home for its top secret stealth ship, the Sea Shadow, and the barge that housed it and kept it...