Looking for a way to keep your neighbor's kids from pirating your WiFi for movie and porn downloads? Researchers believe a paint coating containing aluminum-iron oxides could provide an shield against 2.4 Ghz electromagnetic energy. Shin-ichi Ohkoshi from the University of Tokyo acknowledges many such paints already exist, but his is among the first to block in the gigahertz range. A security engineer at Cisco counters, "Surely the thought of having to redecorate a building in order to provide Wi-Fi security is more costly and complex than security functionality available in even the cheapest of Wi-Fi access points?" Perhaps more importantly, does painting your facility with the key ingredients for thermite sound like a good idea?