Up Next
Back to Show
It's Okay to Be Smart
Why Does Hair Grow The Way It Does?
Season 5
Episode 15
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!
Sign up now for inspiring and thought-provoking media delivered straight to your inbox.
Support Provided By
16:00
Just how big would a telescope need to be to actually see an alien world in detail?
26:19
Dire wolves are back—sort of.
16:53
The key enzyme behind photosynthesis isn’t actually all that great at its job.
16:40
The oldest rocks on Earth are more than just ancient—they’re time machines!
17:11
This is one of the weirdest mysteries of human evolution: Why do we have grandmas?
12:28
Why do some people taste music or hear colors? Let’s talk about synesthesia.
14:35
How a chemical in lizard spit inspired one of the most important medical advancements.
12:15
These diamond makers create one of the most amazing materials on Earth — from dead people.
11:20
Learn nature’s ultimate game of hide-and-seek, and the way to win this game is all in the brain.
11:17
Nature has had to come up with some crazy ways to survive winter. None are weirder than hibernation.
12:40
Political scientist Don Green joins Joe to figure out the complex psychological and social factors t
16:27
Why do certain sounds make some of us so upset?!