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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.

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  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.

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  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.