Flocking Copper
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This video tracks the movement of tiny copper rods. When the rods are packed densly enough and shaken, they swarm and swirl like schools of fish. Researchers aren't exactly sure why it happens but it has to do with their shape. Video courtesy of V. Narayan, S. Ramaswamy, N. Menon. Viewed 2261 times.
Learn more: Rods of Copper that Swim Like Fish
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