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  1. Earth

    Water Vapor by Any Other Name

    One can learn a lot by studying clouds—or just relax and soak in their beauty. Subscribers to both schools can find plenty of fodder in the British Cloud Appreciation Society’s gallery of nearly 3,200 photos. They’re organized by meteorological type, optical effects, and even by what a cloud might resemble—like “Casper the Ghost, spotted over […]

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  2. Planetary Science

    A sunlike star’s early development

    A new infrared portrait of an embryonic sunlike star reveals an early, crucial step in the process of planet formation.

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  3. Perchlorate Pump: Molecule draws contaminant into breast milk

    A molecular pump meant to transport iodine also concentrates perchlorate, an environmental pollutant, in breast milk.