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Algae-powered robotic arms move with light
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Algae-powered robotic arms move with light

So, researchers at Delft University of Technology have made tiny, flexible robotic arms that move thanks to living algae. When light reaches the algae, photosynthesis changes the local pH, causing one hydrogel layer to swell and bend the arm. The team also built grippers that can pick up and release very light objects, all without complex mechanical parts or an external power source beyond light. And here's the thing: the movement takes hours to become significant, but this clever proof of concept could inspire soft robots that work gently and with little impact on their surroundings.
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