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  1. Life

    Dried Earth microbes could grow on Mars with just a little humidity

    Showing that salt-loving bacteria can double their numbers after absorbing damp air has implications for life on other planets.

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  2. Health & Medicine

    3-D mammograms are popular, but are they better than 2-D?

    The use of digital breast tomosynthesis, a newer breast cancer screening technology with limited evidence, has risen in recent years.

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  3. Microbes

    Gut microbes might help elite athletes boost their physical performance

    Veillonella bacteria increased in some runners’ guts after a marathon, and may make a compound that might boost endurance, a mouse study suggests.

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  4. Archaeology

    Capuchin monkeys’ stone-tool use has evolved over 3,000 years

    A Brazilian archaeological site reveals capuchins’ long history of practical alterations to pounding implements, researchers say.