If there's one thing most misunderstand about evolution, it's the idea of continuous improvement. Evolution doesn't care about improving on or advancing its last model — it just cares whether or not an organism survives long enough to pass on its DNA, and sometimes that survival comes with unpleasant side effects. When our ancestors began walking on two legs instead of four, for example, it saved precious energy but it also led to a spate of back problems. New research adds one more genetic accident to the list: When humans left Africa, the genetic adaptation that helped them survive the cold may have also led to migraine headaches.
Out of Africa
Written by Ashley Hamer June 1, 2018
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