News

  1. 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
  2. Animals

    Gender bender

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

    By Brian Vastag
  3. Earth

    Cholesterol boosts diesel toxicity

    Nanoparticles in diesel exhaust can activate genes that worsen cholesterol's damaging effects.

    By Janet Raloff
  4. Planetary Science

    Deep Impact and Stardust: Still on assignment

    Two sturdy NASA spacecraft have new assignments, studying comets and looking for exoplanets.

    By Ron Cowen
  5. Health & Medicine

    New Clues: Gene variations may contribute to MS risk

    Variants of two genes encoding immune system proteins may confer a higher risk for multiple sclerosis.