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  1. Readers discuss grassland conservation and a hummingbird flight trick

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  2. 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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  3. 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.

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  4. Paleontology

    50 years ago, trilobite eyes mesmerized scientists

    Decades of research has confirmed that for such simple creatures, trilobites had astoundingly complex eyes.