Why stress can make your hair fall out: A two-part reaction

It's well known that stress can trigger hair loss. A new paper explores how this happens and how our response to stress can have long-term consequences for our scalps, research that may eventually yield insights into autoimmune ...

Why some humans grow horns

Equids, members of the horse family including horses, donkeys and zebras, share curious features called chestnuts. Found on every horse, they appear as toughened growths on their limbs, and can be clipped back if they grow ...

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