Compact disk players, for example, use lasers to read digitized signals and translate them into electronic messages that become sound. The technology had been around, but the players revolutionized the way people listened to music when introduced in the 1980s. The U.S. Army has linked it with software that enables technicians to service its Apache attack helicopters. The device is also useful for surgeons, police, firefighters and me-chanics. But it does not come cheap.
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