Moisture-responsive 'robots' crawl with no external power source

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Using an off-the-shelf camera flash, researchers turned an ordinary sheet of graphene oxide into a material that bends when exposed to moisture. They then used this material to make a spider-like crawler and claw robot that move in response to changing humidity without the need for any external power.
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Moisture-responsive 'robots' crawl with no external power source was originally posted by Health Nutrition And Fitness News