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Humans are mammals, which means that we have hair on our bodies and heads. Sometimes, as people get older, they lose some of that head hair. How does it happen? Do hair goblins come at night and sneak away with those silky strands? Ok, it’s probably not that. We asked pediatrician Dr. Emma Gerstenzang to help us find the answer.

Got a hair-raising question? Send it to us at BrainsOn.org/contact, and we’ll help tease out the answer.