soft muscles
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Robot bees can crash into walls without taking damage
Tiny robotic fliers aren't exactly durable at present, but they may be tough critters before long. Harvard researchers have developed a RoboBee that uses soft, artificial muscles (really, actuators) to fly without taking damage. The robot can smack into walls, crash-land or even collide with fellow 'bees' without getting hurt. Soft-muscle fliers have existed before, but this is the first with enough power density and control to hover -- that is, it's not just flying wildly.