Where Did That One Thick, Dark Hair Come From?

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Some days you look in the mirror and find a long dark hair where it didn't use to be. Maybe you're going through puberty, pregnancy, or menopause. Maybe you're not. But either way, that hair didn't appear out of nowhere. It just went through a bit of a transformation.

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Sources:
https://onlinelibrary.wiley.com/doi/full/10.1111/php.12433
https://www.jidonline.org/article/S0022-202X(15)30721-1/fulltext
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6289065/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4793925/
https://royalsocietypublishing.org/doi/10.1098/rspb.2018.1520
https://www.sciencedirect.com/science/article/pii/S0015028216483202?via%3Dihub
https://academic.oup.com/bjd/article/107/5/559/6689215
https://www.frontiersin.org/articles/10.3389/fphar.2019.01528/full

Image Sources:
https://www.gettyimages.com/detail/video/asian-young-womans-cheek-with-typical-problem-with-acne-stock-footage/1193011783?phrase=mirror%20woman%20face&adppopup=true
https://www.gettyimages.com/detail/video/my-identity-carefree-stock-footage/1368258269?phrase=hair&adppopup=true
https://www.gettyimages.com/detail/video/extreme-close-up-of-asian-male-leg-hair-slider-shot-stock-footage/1441124223?phrase=close%20up%20body%20hair&adppopup=true
https://www.gettyimages.com/detail/photo/young-chimpanzee-standing-up-like-a-human-royalty-free-image/92120395?phrase=chimp&adppopup=true
https://www.gettyimages.com/detail/video/detail-of-skin-and-hair-on-females-arm-stock-footage/816257492?phrase=arm%20hair&adppopup=true
https://www.gettyimages.com/detail/video/beautiful-hair-stock-footage/1339303545?phrase=hair&adppopup=true
https://www.gettyimages.com/detail/video/close-back-view-of-brown-woman-hair-tender-movement-in-stock-footage/1326084987?phrase=hair%20and%20sun&adppopup=true
https://www.gettyimages.com/detail/video/forehead-of-very-sweating-adult-young-man-stock-footage/1301352115?phrase=sweat&adppopup=true
https://www.gettyimages.com/detail/video/texture-of-the-skin-close-up-drops-of-water-roll-down-stock-footage/831896924?phrase=sweating&adppopup=true
https://www.gettyimages.com/detail/illustration/diagram-of-body-odor-and-sweat-glands-human-royalty-free-illustration/1193095625?phrase=sweat%20gland&adppopup=true
https://www.gettyimages.com/detail/video/man-in-blue-t-shirt-with-sweat-stain-stock-footage/1384723356?phrase=sweat&adppopup=true
https://www.gettyimages.com/detail/video/asian-senior-couple-walking-and-talking-inside-public-stock-footage/1290265340?phrase=couple%20sweating&adppopup=true
https://www.gettyimages.com/detail/video/armpit-hair-stock-footage/1303793837?phrase=armpit%20hair&adppopup=true
https://www.gettyimages.com/detail/video/microscopy-of-human-hair-magnification-150x-root-and-stock-footage/1226334755?phrase=keratin&adppopup=true
https://www.gettyimages.com/detail/video/hair-loss-concept-with-man-checking-his-hair-stock-footage/1401965490?phrase=scalp&adppopup=true
https://www.gettyimages.com/detail/video/human-hair-under-a-microscope-stock-footage/1078737004?phrase=hair%20microscopic&adppopup=true
https://www.gettyimages.com/detail/video/4k-extreme-close-up-microscopic-view-of-human-hair-stock-footage/1146701712?phrase=hair%20microscopic&adppopup=true
https://www.nature.com/articles/s41467-020-19249-z/figures/1
https://www.gettyimages.com/detail/photo/closeup-shot-of-long-curly-brunette-hair-royalty-free-image/1365604508?phrase=hair&adppopup=true
https://commons.wikimedia.org/wiki/File:Androstanolone.svg
https://www.gettyimages.com/detail/video/macro-close-up-shot-of-wool-or-fur-stock-footage/1299827600?phrase=hair
https://commons.wikimedia.org/wiki/File:Human_hair_2000X_-_SEM_MUSE.tif