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  1. Earth

    Air-Pollution Pileup: Mediterranean endures emissions from afar

    Although most Mediterranean countries aren't big polluters, the area is a crossroads for pollution-carrying air currents from Europe, Asia, and North America.

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  2. Outmuscled: Muscles, not nerve cells, fail in old worms

    In aging worms, the nervous system stays intact but muscles don't.

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  3. Astronomy

    Cloudy Findings: A new population shows up in the Milky Way

    A radio telescope has detected a previously unknown population of hundreds of hydrogen clouds in the gaseous halo that surrounds the disk of our galaxy.

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  4. Anthropology

    Ancient Lure of the Lakes: Early Americans followed the water

    Archaeological investigations in Chile indicate that beginning around 13,000 years ago, early American settlers lived at high altitudes during humid periods, when they could set up hunting camps on the shores of lakes.