Some hair dyes are basically fine-grained paint, but dyes that stick with you for more than a couple weeks physically and chemically change each hair. Learn how in this episode of BrainStuff.
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How Did a Wisconsin Woman Lead a German Resistance to Nazis?
10:45

Are Lobsters Functionally Immortal?
13:02

Is It 'Jerry-Rigged' or 'Jury-Rigged'?
05:19