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  1. Physics

    Spherical flames in space could solve the mystery of soot-free fires

    In microgravity, flames are sphere-shaped. Tests of fire on the International Space Station are helping show how gases flow within flames.

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  2. Chemistry

    Sweaty, vinegary and sweet odors mingle to make dark chocolate’s smell

    Scientists have worked out the chemistry of dark chocolate’s smell and reconstructed the aroma.

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  3. Health & Medicine

    Faulty cellular antennae may cause a heart valve disorder

    Mitral valve prolapse might be caused by dysfunctional primary cilia meant to signal cells during development.

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  4. Environment

    Emissions of a banned ozone-destroying chemical have been traced to China

    Since 2013, eastern China has increased its annual emissions of a banned chlorofluorocarbon by about 7,000 metric tons, a study finds.