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  1. Earth

    Gasp! Ozone limits don’t protect babies

    In healthy infants, even ozone concentrations well below those allowed by federal law trigger asthmalike symptoms.

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  2. Astronomy

    Spewing superdust

    Astronomers have identified a type of supernova as the main source of space dust.

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  3. 19691

    Tiktaalik may not have left the water by choice, to avoid predators, or to get more oxygen. Instead, it might have found itself left behind on a muddy floodplain each time waters receded with the tide. Tiktaalik ‘s “limbs” were probably first developed to survive in an environment that required bracing and stabilizing against currents, […]

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  4. Paleontology

    Amphibious Ancestors

    Newly discovered fossils from Greenland, as well as a reexamination of those of previously known creatures, are providing researchers with additional insights into ancient vertebrates' move from water to land.