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  1. Astronomy

    Super Data: Hail the cosmic revolution

    Ten extremely distant supernovas recently discovered by the Hubble Space Telescope provide evidence that something is pushing objects in the cosmos apart at an ever-faster rate.

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  2. Earth

    When Genes Escape

    The focus of the debate over transgenic crops has changed from whether genes will escape to what difference it will make when they do.

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  3. Earth

    Scrutinized chemicals linger in atmosphere

    The newly determined longevity in the atmosphere of certain perfluorinated chemicals indicates that they may disperse environmental contamination far and wide.

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  4. Physics

    Cassini confirms Einstein’s theory

    En route to a 2004 rendezvous with Saturn, the Cassini spacecraft has verified a key prediction of Einstein’s theory of general relativity to an accuracy 50 times better than that of previous measurements.