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  1. Health & Medicine

    Heavy traffic may trigger heart attacks

    Exposure to traffic can dramatically increase a person's risk of having a heart attack soon afterward.

    By Diana Parsell
  2. Planetary Science

    Riddles on Titan

    Two puzzles have emerged from the Cassini spacecraft's first close flyby of Saturn's largest moon, Titan.

    By Ron Cowen
  3. Physics

    Light step toward quantum networks

    During the transfer of a quantum data bit from matter to light, a cloud of extremely cold atoms emitted a photon carrying a version of the cloud's quantum state.

    By Peter Weiss
  4. Agriculture

    Frozen Assets

    A U.S. gene bank has begun deep-freezing semen and other livestock 'seed' for possible future use in research or breeding.