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  1. Life

    Immune cells play surprising role in steady heartbeat

    Immune system cells called macrophages help heart cells rhythmically contract, maintaining the beat of mice’s hearts.

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  2. Earth

    50 years ago, continental drift began to gain acceptance

    Half a century later, plate tectonics is well-established but still an active field of research.

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  3. Climate

    Plot twist in methane mystery blames chemistry, not emissions, for recent rise

    The recent rise in atmospheric methane concentrations may have been caused by changes in atmospheric chemistry, not increased emissions from human activities, two new studies suggest.

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  4. Oceans

    The Arctic is a final garbage dump for ocean plastic

    Ocean currents dump plastic garbage from the North Atlantic into previously pristine Arctic waters, new research shows.