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  1. Health & Medicine

    Germs That Do a Body Good

    Research on probiotic bacteria—living microbes that confer health benefits when introduced into the body—offers growing medical promise.

    By Ben Harder
  2. Math

    Sampling for Superclarity

    An audio compact disc (CD) holds up to 74 minutes, 33 seconds of music, just enough for a complete recording of Ludwig van Beethoven’s Ninth Symphony on one disc. Each second of music is stored as a string of about 1.5 million bits, represented as tiny, narrow pits on the disc’s surface. These pits range […]

    By Ivars Peterson
  3. Astronomy

    Seeing green: Color of the cosmos

    We live in a pale-green universe, according to astronomers who analyzed the colors of some 200,000 galaxies as part of the largest galaxy survey completed to date.