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  1. Paleontology

    Big dinosaurs kept their cool

    Body temperature of long-gone beasts resembled that of mammals, study of fossil teeth suggests.

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  2. Health & Medicine

    Food choices matter in weight control

    Potatoes and sugary soft drinks add pounds, a long-term analysis shows; fruit, yogurt and nuts help shed them.

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  3. Life

    Life

    Ultrasonic ribbits, saving dead trees and fishy retribution in this week’s news.

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  4. Life

    Multicellular life arises in a test tube

    A yeast experiment recapitulates a major early milestone in the history of life.

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  5. Space

    NASA spacecraft puts moon in new focus

    Images from the Lunar Reconnaissance Orbiter show fine details of the lunar surface.