There's a lot of natural variation in the color of human hair. Learn the physical explanation for the difference in this classic episode of BrainStuff.
Learn more about your ad-choices at https://www.iheartpodcastnetwork.com

How Did Beer Help Sell the Myth of Custer's Last Stand?
10:08

How Does Bioluminescence Work?
12:15

How Is Maillardet's Automaton Still Wowing Us After 200 Years?
09:28