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  1. Earth

    Prenatal nicotine: A role in SIDS?

    New data suggest why exposure to nicotine in the womb can put an infant at greater risk of sudden infant death syndrome.

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  2. Health & Medicine

    Little vessels react to magnetic switch

    Magnets can act like vascular switches, increasing or decreasing blood flow to a region of the body.

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  3. Earth

    Traces of lead cause outsize harm

    Minute amounts of lead in blood are worse for children than had been realized.

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  4. Math

    Recycling Topology

    It’s hard to miss the triangle of three bent arrows that signifies recycling.