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  1. Archaeology

    Ancient tunnel keeps biblical date

    Radiocarbon dating of material from an ancient tunnel in Jerusalem indicates that the passage was built around 700 B.C., supporting a biblical account of the tunnel's construction.

    By Bruce Bower
  2. Paleontology

    Some trilobites grew their own eyeshades

    The 380-million-year-old fossil of a trilobite strongly suggests that members of at least some trilobite species were active during the daytime, a lifestyle that scientists previously had only suspected.

    By Sid Perkins
  3. Plants

    Bean plants punish microbial partners

    In a novel test of how partnerships between species can last in nature, researchers have found that soybeans punish cheaters.

    By Susan Milius
  4. Physics

    Hot Crystal

    In seeming violation of one of the laws of physics, a new type of metal microstructure promises to lead to far more efficient incandescent light bulbs and also to boost the development of light-based microcircuits and heat-to-electricity generators.