News

  1. Tech

    What Jefferson was thinking

    Imaging technology reveals a last-minute revision to the Declaration of Independence.

    By Janet Raloff
  2. Humans

    Botox injections put a crease in emotional evaluations

    By immobilizing a muscle needed for frowning, Botox injections may interfere with a person’s ability to assess others’ emotions.

    By Bruce Bower
  3. Life

    Saber-toothed cats strong-armed prey

    Smilodon fatalis used strong forelimbs to pin victims, an analysis of fossils shows.

    By Gwyneth Dickey
  4. Life

    Evolutionary adaptation breeds gender-identification confusion

    The rise of camouflage among some lizards in White Sands National Monument has generated a communication breakdown.

    By Susan Milius
  5. Health & Medicine

    For most centenarians, longevity is written in the DNA

    A study of people who live past 100 reveals many genetic paths to a long life.