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  1. Quantum Physics

    A measurement of positronium’s energy levels confounds scientists

    A gap in the energy levels of positronium seems to be substantially larger than predicted, and physicists don’t know why.

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  2. Health & Medicine

    New treatments aim to treat COVID-19 early, before it gets serious

    Some new drugs that may stop the coronavirus from getting into cells, or from reproducing itself, may treat the illness as soon as it’s diagnosed.

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  3. Readers ask about Mars dust storms, Fermi bubbles and more

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  4. When science doesn’t yet have the answers

    Editor in chief Nancy Shute writes about going back to school in the midst of a pandemic.