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  1. Health & Medicine

    Hepatitis B found in wrestlers’ sweat

    Traces of hepatitis B have turned up in the perspiration of wrestlers, suggesting that the virus could spread to their opponents and teammates.

    By Nathan Seppa
  2. Paleontology

    Catching evolution in the act

    Paleontologists have unearthed fossils that provide direct evidence of something scientists had long suspected: The tiny bones in the middle ears of modern-day mammals evolved from bones located at the rear of their reptilian ancestors' jaws.

    By Sid Perkins
  3. Health & Medicine

    Preemies respond to immunizations

    Babies born prematurely rev up an immune response to two routine childhood vaccines as well as babies who are born full-term.