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  1. Plants

    Botany under the Mistletoe

    Twisters, spitters, and other flowery thoughts for romantic moments.

    By Susan Milius
  2. Math

    Visions of Infinity

    Tiling a hyperbolic floor inspires both mathematics and art.

    By Ivars Peterson
  3. Tech

    Ink-jet dots form transistor spots

    A new technique makes ink-jet printing of transistor circuits possible from conductive polymer inks.

    By Peter Weiss
  4. Chemistry

    Researchers stretch for improved surfaces

    A surprisingly simple, new technique could create better coatings for everything from medical implants to ship hulls.

    By Jessica Gorman
  5. Math

    Proof clarifies a map-folding problem

    Researchers have developed an efficient algorithm to determine, given a collection of creases on a piece of paper, whether a sequence of simple folds produces a flat result, like a folded road map.