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  1. Chemistry

    Nanoparticles in foods raise safety questions

    As scientists cook up ways to improve palatability and even make foods healthier, some are considering the potential health risks of tiny additives.

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  2. Animals

    How to drink like a bat

    Some bats stick out their tongues and throbs carry nectar to their mouths.

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  3. Paleontology

    Dimetrodon’s diet redetermined

    The reptilelike Dimetrodon dined mainly on amphibians and sharks, not big herbivores as scientists once believed.

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  4. Anthropology

    Sleep time in hunter-gatherer groups on low end of scale

    Hunter-gatherer communities in Africa and South America have similar sleeping patterns as people living in postindustrial societies, researchers find.