News

  1. Earth

    Remnants from Earth’s birth linger 4.5 billion years later

    Shaken, not stirred: Tungsten isotopes reveal that mantle convection has left some remnants of ancient Earth untouched for 4.5 billion years.

    By Beth Geiger
  2. Life

    Gut microbe may challenge textbook on complex cells

    Science may finally have found a complex eukaryote cell that has lost all of its mitochondria.

    By Susan Milius
  3. Life

    How to trap sperm

    Lab-made beads can trick and trap sperm, potentially preventing pregnancy or selecting sperm for fertility treatments.

    By Sarah Schwartz
  4. Health & Medicine

    Healthiest weight just might be ‘overweight’

    The body mass index tied to lowest risk of death has risen since the 1970s.