Feature

  1. Dying before Their Time

    Genetically engineered mice that get prematurely old give hints to the causes of aging.

    By John Travis
  2. Astronomy

    Heavenly Passage

    On June 8, the black dot of Venus passed across the face of the sun, the first time it did so in 122 years.

    By Ron Cowen
  3. Humans

    Of Rats, Mice, and Birds

    Fireworks erupt over an extension of rules to protect lab animals.

    By Janet Raloff
  4. Tech

    Little Big Wire

    High-temperature superconductivity makes a bid for the power grid.

    By Peter Weiss
  5. Earth

    Dead Heat

    New studies suggest that adverse health effects related to global warming aren't just a theoretical concern for the distant future.