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  1. 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
  2. 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.

    By Ron Cowen
  3. Health & Medicine

    Mummies reveal heart disease plagued ancient Egyptians

    CT scans of preserved individuals show hardening of arteries similar to that seen in people today.

    By Laura Beil
  4. Life

    Killer bees aren’t so smart

    Brains are probably not what powers the invasive bee’s takeover from European honeybees

    By Susan Milius
  5. Life

    Penguin DNA evolving faster than thought

    Comparing the DNA in modern birds to that in ancient generations shows molecular evolution happens at varying rates, and that each species has its own rate of evolution.