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  1. Health & Medicine

    Stem cell clinics’ much-hyped treatments lack scientific support

    Stem cell treatments for knee pain are strong on marketing, weak on science.

    By Laura Beil
  2. Space

    These are the most detailed images of the sun ever taken

    First images from the Daniel K. Inouye Solar Telescope reveal details on the surface of the sun three times as small as ever seen.

    By Christopher Crockett
  3. Health & Medicine

    Your most pressing questions about the new coronavirus, answered

    As the new coronavirus outbreak unfolds, we are updating this FAQ with the latest on the race to understand the virus and stop the growing global health crisis. Our most recent update was posted February 18.