How Does Hair Know When to Stop Growing?
The hair on your scalp can get really long, but your leg hair doesn’t sweep the floor. Why not?
Hosted by: Hank Green
Dooblydoo thanks go to the following Patreon supporters — we couldn’t make SciShow without them! Shout out to Christopher Prevoe, Justin Ove, John Szymakowski, Peso255, Ruben Galvao, Fatima Iqbal, Justin Lentz, and David Campos.
Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow
Or help support us by becoming our patron on Patreon:
Looking for SciShow elsewhere on the internet?
You are watching How Does Hair Know When to Stop Growing? on Hot Stream