News

  1. Animals

    Den Mothers: Bears shift dens as ice deteriorates

    As Arctic ice has dwindled, pregnant polar bears in northern Alaska have become more likely to dig their birthing dens on land or nearshore ice than on floating masses of sea ice.

    By Susan Milius
  2. Computing

    Check on Checkers: In perfect game, there’s no winner

    Thanks to an immense calculation that worked out every possible game position, computers can now play a flawless game of checkers and force a draw every time.

    By Julie Rehmeyer
  3. Health & Medicine

    Persistent Prions: Soilbound agents are more potent

    Prions, deformed proteins that cause brain-destroying diseases such as chronic wasting disease or mad cow disease, are more infectious when bound to soil particles.