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  1. Health & Medicine

    X Ray Excels: Technique brings a new image to medicine

    Recent advances in a technique called phase-contrast x-ray imaging could make it easier for physicians to spot tumors, clogged arteries, and other soft-tissue problems.

    By Naila Moreira
  2. Health & Medicine

    Comb over Chemicals: Tool may rid heads of pesticideproof lice

    Used systematically, special combs may be more effective than insecticidal shampoos at ridding a child's scalp of head lice.

    By Ben Harder
  3. Anthropology

    Reservoirs of Evolution: Rainy periods linked to human origins in Africa

    Three phases of heavy rainfall in eastern Africa between 2.7 million and 900,000 years ago created deep lakes and might have played a critical role in the evolution of human ancestors.