Researchers have discovered what makes the shark almost impossible to outswim. By using an engineering imaging technique, researchers have discovered that as a shark's tail swings from side to side, it creates twice as many jets of water as other fishes' tails, smoothing out the thrust and likely making swimming more efficient.
Sharks do this by stiffening the tail midswing, a strategy that might one day be applied to underwater vehicles to improve their performance.
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the whole story at Wired.
