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  1. Readers discuss quantum gravity and more

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  2. Come along with us on a mathematical mystery tour

    Editor in chief Nancy Shute discusses an unexpected breakthrough on a puzzle that has intrigued mathematicians for almost a century.

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  3. Physics

    Here’s how scientists reached nuclear fusion ‘ignition’ for the first time

    The first fusion experiment to produce an energy excess required meticulous planning and also revealed a long-predicted heating phenomenon.

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  4. Neuroscience

    Ancient viruses helped speedy nerves evolve

    A retrovirus embedded in the DNA of some vertebrates helps turn on production of a protein needed to insulate nerve cells, aiding speedy thoughts.