Picturing how our species might appear in the far future can invite wild speculation over standout features such as height , brain size , and skin complexion . Yet subtle shifts in our anatomy today demonstrate how unpredictable evolution can be.

Take something as mundane as an extra blood vessel in our arms, which, going by current trends, could be commonplace within just a few generations.

An artery that temporarily runs down the center of our forearms while we're still in the womb isn't vanishing as often as it used to, according to a study published in 2020 by researchers at Flinders University and the University of Adelaide in Australia.

Watch the clip below for a summary of their findings:

That means there are more adults than ever with what amounts to an extra channel of

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