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  1. Animals

    That’s One Weird Tooth

    The narwhal's distinctive spiral tusk has structures that could make it phenomenally sensitive, raising new questions about its functions.

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  2. Materials Science

    Making the Most of It

    A recent crop of studies demonstrates how nature finds strength in unlikely places.

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  3. Nonstick chemicals upset behavior

    A study in mice finds that early-life exposure to the fluorinated chemicals used in nonstick products can rewire the brain in ways that dramatically affect behavior.

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  4. Chemistry

    Drinking increases skin’s permeability

    Drinking alcohol can greatly compromise the skin's barrier to chemicals.

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  5. Earth

    Leaden streets

    Street grit is the probable source of lead in urban homes, and flaking paint from overpasses and bridges is a major contributor.