News

  1. Earth

    Air held oxygen early on

    Chemical analyses of South African sediments suggest that oxygen was present in small quantities about 2.32 billion years ago, which is at least 100 million years earlier than previously thought.

    By Sid Perkins
  2. Earth

    Scooting on a Wet Bottom: Some undersea landslides ride a nearly frictionless slick of water

    New computer simulations suggest that hydroplaning may be responsible for the unexpectedly large distances traversed by some undersea avalanches.

    By Sid Perkins
  3. Health & Medicine

    Conduit to the Brain: Particles enter the nervous system via the nose

    Tiny airborne particles can apparently infiltrate the brain by shimmying up the nerve that governs smell.