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  1. Seminal Discovery: Promiscuous females speed sperm evolution

    A gene responsible for semen viscosity has evolved more rapidly in primate species with promiscuous females than in monogamous species.

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  2. Earth

    Damp sandcastles

    What keeps the 500-meter-tall dunes of China's Badain Jaran desert immobile, despite arid, windy conditions, is a previously unknown source of groundwater.

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  3. Animals

    Color at Night: Geckos can distinguish hues by dim moonlight

    The first vertebrate to ace tests of color vision at low light levels—tests that people flunk—is an African gecko.

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  4. Neural Feel for Seeing: Emotion may mold early visual activity in brain

    The amygdala, an inner-brain structure that coordinates reactions to fearful sights, influences early stages of visual perception in far-removed brain regions.