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  1. Planetary Science

    An asteroid may have exploded over Antarctica about 2.5 million years ago

    Tiny spherules of rock found in Antarctic ice may point to the oldest known “airburst,” or midair disintegration of an incoming asteroid.

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  2. Chemistry

    The smallest known molecular knot is made of just 54 atoms

    Chemists are still trying to figure out why this combination of gold, phosphorus, oxygen and carbon atoms resulted in a molecular knot in the first place.

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  3. Readers discuss grassland conservation and a hummingbird flight trick

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  4. Using public health research to save lives

    Editor in chief Nancy Shute discusses how overdose prevention centers, where people can use drugs in a supervised setting, are saving lives.