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  1. 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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  2. Readers discuss grassland conservation and a hummingbird flight trick

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  3. 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.

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  4. Planetary Science

    Bacteria that can make humans sick could survive on Mars

    Experiments suggest that common illness-causing microbes could not only survive on the Red Planet but also might be able to thrive.