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Stealth-Based Wallpaper Stops Wi-Fi Signals Dead: “One of the many issues companies bring up in explaining why they won’t install Wi-Fi wireless networks is the ‘bleeding’ issue: the wireless ‘bleeds’ beyond the walls of their building and out into the parking lot, where some creative hackers might be able to get access. Well, if someone’s got a problem, someone else is likely to come along and solve it. British defense contractor BAE has taken some of that stealth bomber material they had lying around and put it up on the walls and discovered it blocks Wi-Fi. In other words, companies could put up this wallpaper and stop the Wi-Fi from bleeding out beyond the walls. Of course, I would imagine that stealth wallpaper doesn’t come cheap.”