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  1. Animals

    A risk-tolerant immune system may enable house sparrows’ wanderlust

    Birds that are willing to eat seed spiked with chicken poop have higher expression levels of a gut immunity gene, a new study finds.

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  2. Climate

    Extraordinary heat waves have readers asking how A/C affects greenhouse gas emissions

    Air conditioning is responsible for nearly 4 percent of total global greenhouse gas emissions but that will climb along with rising temperatures.

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  3. Of frogs and the people who love them

    Editor in chief Nancy Shute discusses frogs and chytrid fungus, trilobite fossils and a dinosaur named after the Norse god of mischief.

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  4. Readers ponder sign language in ancient humans, looped universe

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  5. Earth

    Why Japan issued its first-ever mega-earthquake alert

    After a magnitude 7.1