News

  1. Health & Medicine

    Promise and perils of marijuana deserve more scientific scrutiny

    Report outlines medical potential and health dangers of cannabis and its components.

    By Bruce Bower
  2. Chemistry

    New molecular knot is most complex yet

    The knot is woven from 192 atoms of carbon, hydrogen, oxygen and nitrogen and forms a triple braid with eight crossing points.

    By Meghan Rosen
  3. Neuroscience

    How mice use their brain to hunt

    Messages from the brain’s amygdala help mice chase and kill prey.

    By Laurel Hamers
  4. Animals

    It takes guts for a sea spider to pump blood

    Most sea spiders have hearts, but what really gets their blood flowing are gut contractions.