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摘要

The water was cool and still, perfect for a dip. The swimmer had struck out confidently from the shore, when suddenly a dark shape appeared below him. There was a commotion in the water, and then a stabbing pain in his left leg as a set of sharp teeth sank into his flesh. Thrashing his body from side to side in panic, he wrenched himself free, then struggled the short distance to shore. But his leg was still in the mouth of the cruel predator. Unfazed, the swimmer took things easy for a few weeks, and sure enough his patience was rewarded—he grew a brand new leg. A fairy story? Far from it. Our swimmer is a newt, and regeneration comes naturally. But perhaps the same story could soon come true for humans, too.