文件名称：一分钟科技新闻04-22
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更新时间：2012-05-23 06:45:33
一分钟
一分钟科技新闻04-22 Ear Cells Actively Amplify Sound A study in the journal Public Library of Science ONE reveals that the ear's hair cells act like tiny motors and respond to sound by swaying and driving electrical currents that cause positive feedbacks, which amplify sound. Karen Hopkin reports. Just when you thought you’d heard everything, scientists have found that the reason you can hear everything—including things that are very quiet—is because your ears have tiny tubelike motors that mechanically amplify sounds.