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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, ...
Lizards are famous for their strange ability to lose their own tails. This ability is called tail autotomy, a survival strategy in which a lizard voluntarily detaches its own tail. While this ...
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