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  1. Archaeology

    An ancient pouch reveals the hallucinogen stash of an Andes shaman

    South American shamans in the Andes Mountains carried mind-altering ingredients 1,000 years ago, a study finds.

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  2. Physics

    LIGO is on the lookout for these 8 sources of gravitational waves

    Gravitational wave hunters are on a cosmic scavenger hunt. Here’s what they’re hoping to find.

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  3. Science & Society

    Medical student evaluations appear riddled with racial and gender biases

    Women and minorities are more frequently described by personality in medical student evaluations, but men are described by their skills, a study says.

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  4. Ecosystems

    War wrecked an African ecosystem.