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  1. When Mice Fly: Bat DNA leads to longer limbs in mouse embryos

    Mice with a stretch of bat DNA grow longer limbs, a possible step in the evolutionary path to wings.

    By Ewen Callaway
  2. Astronomy

    Second Time Around: Some old stars may make new planets

    Two old stars appear to have been rejuvenated and may be undergoing a new wave of planet formation hundreds of millions to billions of years after young stars normally do.

    By Ron Cowen
  3. Humans

    A Thirst for Meat: Changes in diet, rising population may strain China’s water supply

    Rapid industrialization, an increase in population, and a growing dietary preference for meat in China are straining the country's water resources to the point where food imports probably will be needed to meet demand in coming decades.