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  1. Tech

    A thin laser gets thinner

    Researchers have created a microchip laser that fires an extraordinarily thin beam of high-intensity light.

    By Peter Weiss
  2. Astronomy

    Temperamental Monsters

    A new theory suggests that many huge stars undergo outbursts during which they shed most of their mass late in life rather than doing it gradually over their 3-to-4-million-year lifetimes.

    By Ron Cowen
  3. Health & Medicine

    Calling Death’s Bluff

    New methods of assessing a person's risk of sudden death due to a heart arrhythmia may enable doctors to better identify which patients need to receive an implanted defibrillator.

    By Ben Harder
  4. Humans

    Letters from the September 23, 2006, issue of Science News

    Moo juiced? I live in Northern California, where forest-biomass power plants are common (“Radiation Redux: Forest fires remobilize fallout from bomb tests,” SN: 7/15/06, p.