By now, we've endured endless scaremongering stories about how Wifi is insecure, how hackers are snooping on your wireless email, woof woof, meow meow. That stuff is rather dim, given that there have been almost no reports of crimes committed by anyone snooping on anyone else's signal. Nonetheless, it is true that Wifi is leaky, and sprays your signal -- crypted or unencrypted -- outside the room you're in.

Unless you have "stealth wallpaper", that is! The UK military contractor BAE Systems took the technology they used to stealthify bombers -- layers of printed copper circuitry on Kapton polymer -- and turned it into panels that you can use to wallpaper a room. Presto: Wifi signals cannot escape. Even cooler, as a story on Silicon.com notes, you can modularly switch 'em on and off:

They come in two varieties: passive, which is effectively permanent, and active, where various areas can be switched on and off to enlarge or limit the area of the network.

(Thanks to Techdirt Wireless for this one!)