Two chimps groom each other at the Save the Chimps facility in Florida. The National Institutes of Health owns about 360 chimpanzees that aren't yet retired and that are living at research facilities; new guidelines say most of its chimps should be retired. Save the Chimps hide caption

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Save the Chimps

Rules Would Retire Most Research Chimps

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Ayodhya Ouditt/NPR

Finally, A Map Of All The Microbes On Your Body

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