Dutch scientists build a light-powered robotic arm from algae

In short

• The arm is about two centimetres long, made of living algae and two layers of gel.
• Light controls it, and it needs no conventional motor.
• Underwater, it grasped a metal ball and lifted a rubber ring.

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This is a laboratory demonstration, not a product in use. The source does not say when, or whether, the design could reach practical use. Soft machines that run on light could still matter for work in water, where motors are hard to fit.

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For kids

Scientists in the Netherlands made a tiny robotic arm. It is made from living algae and gel. It can pick up a small metal ball when light shines on it. Why do you think a robot might work without a motor?