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  1. Earth

    It’s a Rough World

    Scientists are using fractals, mathematical forms that can describe objects with fractional dimensions, to model phenomena such as wildfire propagation and the spread of toxic fluids through rocks and soil.

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  2. 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.

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  3. 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