Hydrogel ‘Hand’ Catches Fish With Ease

Caught by an invisible hand, these fish don’t know what hit them.

The transparent appendage isn’t the latest fad in fishing technology; however, it’s a demonstration of the power of soft robots made from hydrogels—a squishy blend of polymers and water. Researchers from MIT devised a way to 3D-print custom structures from the material and bring them to life with the help of a simple water pump.

The real struggle was devising a way to make the robots fast and strong while maintaining the

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