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Wireless Security Paint

Startup Markets Wireless-Security Paint (via Tinfoil Your House) This is a neat idea, albeit with some possibly inconvenient consequences. The product here is basically a paint, or paint additive, with enough metal shavings to block radio signals, creating a Faraday cage around whatever room you paint with this stuff. It's a pretty cool concept for keeping your neighbors off your wi-fi network, but good luck getting your mobile phone to work through this stuff!