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  1. Physics

    A magnetic trap captures elusive ultracold plasma

    Pinning plasma within a set of magnetic fields offers physicists a new way to study clean energy, space weather and the inner workings of stars.

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  2. Readers react to cosmic smashups and tricky spacecraft landings

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  3. Genetic medicine is fraught with ethical challenges

    Editor in chief Nancy Shute discusses coverage of the ethical questions around genetics and precision medicine.

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  4. Earth

    To understand how ‘night-shining’ clouds form, scientists made one themselves

    A rocket, a bathtub’s worth of water and a high-altitude explosion reveal how water vapor cools the air to form shiny ice-crystal clouds.