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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, ...
WASHINGTON, Feb 28 (Reuters) - Director James Cameron's "Avatar" movies are populated by a species of outsized blue beings resembling humans, except with tails. So why does our species lack a tail, ...
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