Uncategorized

  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. Safety in Numbers

    Mathematics offers innovative weapons for fighting terrorism.

    By Laura Sanders

  5. Enzymes Exposed

    Clearer views of the cell’s movers and shakers threaten a century-old mainstay of biology.