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  1. Extreme Healing: Protein aids limb regrowth in newts

    The ability of newts to regenerate severed limbs depends crucially on a protein released by the insulating sheath around nerves.

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  2. Animals

    Cousin Who? Gliding mammals may be primates’ nearest kin

    Two species of small, little-known rain forest mammals may be primates' closest living relatives.

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  3. Health & Medicine

    Early Arrival: HIV came from Haiti to United States

    New analysis of 25-year-old blood samples indicates that HIV reached the United States in about 1969, 12 years before AIDS was first formally described.

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  4. Math

    Math on Fire

    A supercomputer model fed by real-time data is beginning to make sense of the seemingly unpredictable movement of wildfires.