News

  1. Life

    Climate not really what doomed large North American mammals

    Prevalence of a dung fungus over time suggests megafauna extinctions at end of last ice age started before vegetation changed.

    By Sid Perkins
  2. Health & Medicine

    Marathoners’ hearts stressed, but not necessarily by heart attacks

    Detailed imaging of runners’ hearts before and after races doesn’t find signatures of heart attacks

    By Laura Beil
  3. Space

    Sun may not be a ‘Goldilocks’ star

    The stars that are just right to support life-bearing planets might be dimmer and longer-lived than the sun.

    By Lisa Grossman
  4. Space

    Revving up particles in the cosmos

    Newly recorded gamma rays from a microquasar may reveal how the black holes or neutron stars powering them can accelerate particles to enormous energies.