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  1. Earth

    Dust Up: Office bustle launches anthrax spores

    The commotion of everyday business in indoor spaces contaminated with anthrax can launch the bacterium's dangerous spores into the air.

    By Ben Harder
  2. Planetary Science

    Martian History: Weathering a new notion

    Researchers suggest that intermittent impacts by huge asteroids and comets some 3.5 billion years ago profoundly influenced the landscape of Mars.

    By Ron Cowen
  3. Health & Medicine

    First-Line Treatment: Chronic-leukemia drug clears a big hurdle

    In its first large-scale test on newly diagnosed leukemia patients, the drug imatinib—also called Gleevec and STI-571—stopped or reversed the disease in nearly all patients receiving it.

    By Nathan Seppa
  4. Physics

    Identity Check: Elusive neutrinos morph on Earth, as in space

    Strengthening a challenge to the prevailing theory of particle physics, measurements of elusive particles called antineutrinos from nuclear reactors suggest that no neutrino types, be they matter or antimatter, have stable identities.