News

  1. Astronomy

    Veiled black holes

    Many X ray sources in the sky could be active galactic nuclei smothered by gas and dust that blocks their emission of visible and ultraviolet light.

    By Ron Cowen
  2. Materials Science

    Pliable carbon

    The layers of carbon atoms that form graphite can be assembled into strong but flexible "graphene paper."

    By Davide Castelvecchi
  3. Health & Medicine

    CT heart scans: Risk climbs as age at screening falls

    CT scans are increasingly used to investigate heart blockages, but their X rays can increase cancer risk.

    By Janet Raloff
  4. Animals

    Gender bender

    Disabling a chemical-sniffing organ crucial for courting behavior makes girl mice act like frisky boys.