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  1. Earth

    Clay That Kills: Ground yields antibacterial agents

    A special type of French clay smothers a diverse array of bacteria, including antibiotic-resistant strains and a particularly nasty pathogen that causes skin ulcers.

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  2. 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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  3. 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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  4. 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.