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  1. Health & Medicine

    New software aids virtual colonoscopy

    A computer program helps radiologists spot dangerous growths in the colon without probing inside the body.

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  2. Astronomy

    Dark shadows

    New radio telescope images of the center of the Milky Way make an even more compelling case that a supermassive black hole resides there.

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  3. Earth

    Microbe polishes off pollutant

    Researchers have determined how long a pesticide residue would remain in the environment if the microbe Pseudomonas pavonaceae didn't metabolize it.

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  4. 19621

    This article raises the question of how oxygen levels have changed over the past 2 centuries, when carbon dioxide has been increasing.