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How would you like to block your WiFi so that your cheapskate neighbour can't steal a signal anymore? Scientists from Grenoble INP and the Center Technique du Papier have developed a new product to do so. It's a silver crystal coated wallpaper that can block neighbours from freeloading off your Wi-Fi network.

The silver crystals are arranged in a way that they are able to block certain wireless frequencies. But of course, there's an easier way to do all this. Just password protect your network.

But if for some reason you have a desire for an open network, this silver wallpaper will be having your back. [DVICE via SlashDot]