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What Determines Your Hair Color?

January 16, 20174 min
There's a lot of natural variation in the color of human hair. What's the physical explanation for the difference?Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htmAnd to learn about your ad choices when listening to podcasts, visit https://www.howstuffworks.com/privacy.htm#ad-choices