News

  1. Climate

    Plot twist in methane mystery blames chemistry, not emissions, for recent rise

    The recent rise in atmospheric methane concentrations may have been caused by changes in atmospheric chemistry, not increased emissions from human activities, two new studies suggest.

    By Thomas Sumner
  2. Neuroscience

    Brain gains seen in elderly mice injected with human umbilical cord plasma

    Plasma from human umbilical cord blood refreshes aspects of learning and memory in mice.

    By Laura Sanders
  3. Health & Medicine

    Autism, ADHD risk not linked to prenatal exposure to antidepressants

    Taking antidepressants during pregnancy does not increase the risk of autism or attention-deficit/hyperactivity disorder, two new large studies suggest.

    By Aimee Cunningham
  4. Archaeology

    Shock-absorbing spear points kept early North Americans on the hunt

    Ancient Americans invented a way to make spear points last on an unfamiliar continent.