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  1. Planetary Science

    Ancient Mars wasn’t just wet. It was cold and wet

    Mars may once have held enough water to fill oceans and form coastlines. The planet’s red dust contains water and likely formed in cold conditions.

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  2. Life

    A skull found in Egypt shows this top predator stalked ancient Africa

    Archaeologists uncovered a fossilized skull of an ancient sharp-toothed predator that likely hunted early elephants and primates.

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  3. Animals

    How fish biologists discovered birds of paradise have fluorescent feathers

    A survey of museum specimens reveals that more than a dozen species of the birds sport biofluorescence in feathers, skin or even inside their throats.