Michael Joyner, Mayo Clinic

michael-joyner-mayo-clinic

Michael Joyner, Mayo Clinic

michael-joyner-mayo-clinic

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Scientists now think an elite runner will break the two-hour marathon by mid-2020s

Scientists now think an elite runner will break the two-hour marathon by mid-2020s

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Michael Joyner, Mayo Clinic

PublishedSeptember 18, 2018