Picturing how our species might appear in the far future often invites wild speculation over stand-out 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 anin our arms, which going by current trends could be common place within just a few generations.
That means there are more adults than ever with what amounts to be an extra channel of vascular tissue flowing under their wrist. Anatomists have known for some time that this withering away of the median artery isn't a guarantee. In some cases, it hangs around for another month or so. To compare the prevalence of this persistent blood channel, Lucas and colleagues Maciej Henneberg and Jaliya Kumaratilake from the University of Adelaide examined 80 limbs from cadavers, all donated by Australians of European descent.
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