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1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. This'll just take a minute.
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2 .Most of us blink without thinking.
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3 .But people who've sustained strokes or combat injuries can lose their ability to blink.
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4 .Which is important for lubricating and cleaning the eye.
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5 .Surgery is an option--a small piece of muscle transplanted from the leg can sometimes work.
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6 .But the operation takes 10 hours and has its own dangers.
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7 .So scientists at the University of California, Davis, Medical Center are developing artificial muscles to help patients blink again, work discussed in the Archives of Facial Plastic Surgery.
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8 .The blink system starts with what researchers call an eyelid sling, a small piece of muscle or fabric that holds the eyelid.
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9 .The sling attaches to bone around the eye.
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10 .It's then linked to an electrostatic polymer,
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11 .basically a piece of flexible plastic that expands or contracts via voltage change.
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12 .A tiny battery hidden in a natural hollow in the temple powers the polymer.
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13 .Electrical current keeps the muscles contracted and the eyes open.
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14 .Kill the current and the lid closes.
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15 .Here's the creepy part--the mechanism's been tested on cadavers, which are blinking away.
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16 .But now that the principle is proven, in the next years real patients could be on the brink of a blink.
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17 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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