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  1. Physics

    A new optical atomic clock’s heart is as small as a coffee bean

    Optical atomic clocks are extremely good at keeping time, and they’re on their way to becoming pocket watches.

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  2. Life

    How bacteria nearly killed by antibiotics can recover — and gain resistance

    A pump protein can keep bacteria alive long enough for the microbes to develop antibiotic resistance.

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  3. Earth

    This iconic Humboldt map may need crucial updates

    A seminal, 212-year-old diagram of Andean plants by German explorer Alexander von Humboldt is still groundbreaking — but outdated, researchers say.

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  4. Animals

    Shy fish no bigger than a pinkie provide much of the food in coral reefs

    More than half of the fish flesh that predators in coral reefs eat comes from tiny, hard-to-spot species.