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  1. Health & Medicine

    Poliovirus treatment helped patients with deadly brain tumors live longer

    A genetically modified poliovirus appears to help fight brain cancer, a small, early-stage clinical study suggests.

    By Aimee Cunningham
  2. Climate

    Why won’t this debate about an ancient cold snap die?

    Critics are still unconvinced that a comet caused a mysterious cold snap 12,800 years ago.

    By Carolyn Gramling
  3. Life

    Zika gets the most extreme close-up of any flavivirus

    The closest look yet at Zika virus may reveal some vulnerabilities.

    By Tina Hesman Saey
  4. Neuroscience

    Watch the brain jiggle with each heartbeat

    A new twist on MRI can reveal how the brain wiggles.