How humans might regrow lost limbs
(Image credit: Screenshot/Youtube)

As Hank Green explains below, there are some significant barriers to large mammals like ourselves regrowing lost limbs. But scientists have been closely studying how animals like salamanders do it, and may thus be able to develop some intermediate treatments for humans, like healing lacerations without scarring.

Check it out. --Ryan Cooper

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Ryan Cooper

Ryan Cooper is a national correspondent at TheWeek.com. His work has appeared in the Washington Monthly, The New Republic, and the Washington Post.