Nature is full of surprises. A salamander can lose a leg and then, over weeks, grow it back as if nothing happened. Starfish can re-grow arms, while axolotls (a type of salamander) are known to ...
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Humans are born with tails—but lose them before birth—and scientists still don’t know why we have them at all
Early in pregnancy, something surprising happens. Every human embryo develops a tail. It is not symbolic or imagined. A real extension forms at the base of the spine, complete with vertebrae. Later, ...
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