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This is Scientific American 60-Second Science. I'm Cynthia Graber. This'll just take a minute.

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Most of us blink without thinking.

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But people who've sustained strokes or combat injuries can lose their ability to blink.

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Which is important for lubricating and cleaning the eye.

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Surgery is an option--a small piece of muscle transplanted from the leg can sometimes work.

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But the operation takes 10 hours and has its own dangers.

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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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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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The sling attaches to bone around the eye.

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It's then linked to an electrostatic polymer,

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basically a piece of flexible plastic that expands or contracts via voltage change.

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A tiny battery hidden in a natural hollow in the temple powers the polymer.

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Electrical current keeps the muscles contracted and the eyes open.

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Kill the current and the lid closes.

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Here's the creepy part--the mechanism's been tested on cadavers, which are blinking away.

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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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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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