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No one yet knows whether cellphone radiation can harm people. But just in case, Yaron Mayer of Jerusalem is patenting a way of keeping radiation to a minimum (W0 02/35802). You keep your 鈥渞eal鈥� cellphone in a pocket, from where it transmits to a second, proxy device that looks like a cellphone. The 鈥渇ake鈥� phone talks to the real one over a low-power Bluetooth link. So you make calls on the fake phone while the high-power signals are kept well away from your head.