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How did the leopard get its spots? And why is it that no matter what drugs clever scientists devise to fight diseases like malaria and tuberculosis, new resistant strains still emerge? This week we are talking about mutations in nature, the way all living things evolve to adapt to their environment. How exactly does the process work? With evolutionary biologist Andreas Wagner, plant geneticist Zachary Lippman and designer Alexandra Daisy Ginsberg. (Photo: The Snow Leopard. Credit: Getty Images)
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