News

  1. Hold the Embryos: Genes turn skin into stem cells

    Scientists have found a way to convert a person's skin cells directly into stem cells without creating and destroying embryos.

    By Patrick Barry
  2. Paleontology

    A toothy smile

    Nigersaurus boasted more than 500 teeth, arranged in rows across its mouth.

    By Sarah Williams

  3. Tadpole Slayer: Mystery epidemic imperils frogs

    An emerging protozoal disease has begun to trigger mass die-offs of frog tadpoles throughout much of the United States.

    By Janet Raloff
  4. Health & Medicine

    9/11 reflux

    Up to 20 percent of 9/11 workers in New York City experience symptoms of gastroesophageal reflux disease, also called acid reflux.