Why Does Hair Grow The Way It Does?

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate Try CuriosityStream today: http://curiositystream.com/smart Don’t miss our next video! SUBSCRIBE! ►► http://bit.ly/iotbs_sub ↓↓↓More info and sources below ↓↓↓ Check out more of my friend Kyle’s sweet hair on his channel “Because Science”:    • Because Science with Kyle Hill!   All mammals have hair at some point in their lives, but none of them wear it quite like humans. Why does our hair grow where it does, and not grow where it doesn’t? How does our hair get its color? And why does it go gray and often fall out when we get older and go bald? Learn all about the science of human hair in this week’s video! ----------- REFERENCES: Harding RM, Healy E, Ray AJ, et al. Evidence for Variable Selective Pressures at MC1R. American Journal of Human Genetics. 2000;66(4):1351-1361. Randall, Valerie Anne. "Androgens and hair growth." Dermatologic therapy 21.5 (2008): 314-328. Yablon, J. "What is the latest theory of why humans lost their body hair?." SCIENTIFIC AMERICAN 297.3 (2007): 124-124. APA ----------- FOLLOW US: Merch: https://store.dftba.com/collections/i... Facebook:   / itsokaytobesmart   Twitter: @okaytobesmart @DrJoeHanson Tumblr: http://www.itsokaytobesmart.com Instagram: @DrJoeHanson Snapchat: YoDrJoe ----------- It’s Okay To Be Smart is hosted by Joe Hanson, Ph.D. Director: Joe Nicolosi Writer: Sarah Keartes Producer/editor/animator: Andrew Matthews Producer: Stephanie Noone and Amanda Fox Produced by PBS Digital Studios Music via APM Stock images from Shutterstock http://www.shutterstock.com