Researchers built a breakdancing, light-powered hydrogel robot – Engadget

Researchers at Northwestern University have created a dime-sized robot that looks like an animal you might find at the bottom of the sea. The soft robot is almost 90 percent water by weight. It has a hydrogel exterior while its nickel skeleton allows it to change shape. 
It doesn’t use hydraulics or electricity to move around. Instead, the researchers used a chemical synthesis process to program molecules to respond to light. When the robot is exposed to light, the molecules can repel water. Its…

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