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  1. Health & Medicine

    50 years ago, polio was still circulating in the United States

    The world has never been closer to eradicating polio, but the disease could come roaring back where vaccination is spotty.

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  2. Astronomy

    This may be the first known exoplanet with rain and clouds of water droplets

    For the first time, astronomers have detected water vapor and possibly signs of clouds and even rain in the air of a potentially habitable exoplanet.

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  3. Astronomy

    Giant radio bubbles spew from near the Milky Way’s central black hole

    New structures found at the heart of our galaxy join other bubbles, chimneys and filaments that hint at a turbulent past.