Today, U.S. forces are using acoustic detectors, laser spotters and infrared sensors to spot snipers. Tomorrow, the troops could rely on hollow tubes of zinc oxide, "about one-thousandth the diameter of a human hair," Defense News reports. These zinc oxide (ZnO) nanowires, invented in 2001, are "extremely sensitive to the ultraviolet light in the muzzle flash of a firearm." When struck by ultraviolet photons, the nanowires convert energy from the photons into tiny electrical signals...
Publication date: 2008-05-20
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