News

  1. Earth

    Ancient hot spell is linked to copious carbon dioxide

    A mineral that formed in some lakes during a lengthy and particularly warm period in Earth's past suggests that atmospheric concentrations of carbon dioxide were at that time at least triple those found in today's air.

    By Sid Perkins
  2. Planetary Science

    Web Special: Welcome to Mars’ Victoria Crater

    With stunningly powerful vision, the HiRISE camera on NASA's Mars Reconnaissance Orbiter has taken a remarkable picture that shows the exploration rover Opportunity poised on the rim of Victoria Crater on Mars.

    By Ron Cowen

  3. Wasting Deer: Deer saliva and blood can carry prions

    Saliva alone can transmit a brain-destroying disease from one animal to another.