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  1. Astronomy

    An Illuminating Journey

    Astronomers are beginning to use the cosmic microwave background, the remnant glow from the Big Bang, in a dramatically different way: Instead of treating it as a snapshot of the early universe, researchers are proposing to employ the radiation as a flashlight that probes the evolution of structure in the universe over its entire 13-billion-year history.

    By Ron Cowen
  2. Health & Medicine

    Forget about jet lag, and much more

    Airline flight attendants with chronic jet lag have higher stress hormone concentrations and smaller temporal lobes (centers of short-term memory in the brain)than do more rested attendants.

    By Jessa Netting
  3. Health & Medicine

    Prostate protection? This is fishy

    Diets rich in fish may cut a man's risk of prostate cancer.