Uncategorized

  1. Math

    Sudoku and Graph Theory

    Solving sudoku puzzles may not require mathematics, but mathematicians have found plenty to say about the popular brainteasers.

    By Julie Rehmeyer
  2. Health & Medicine

    Spermicide Flip Side: Compound may promote papillomavirus infection

    The widely used spermicide nonoxynol-9 may boost the infectiousness of human papillomavirus, mouse tests show.

    By Nathan Seppa
  3. Physics

    Dropping the Ball: Air pressure helps objects sink into sand

    A ball plunges deeper into sand under atmospheric pressure than under a vacuum, because the presence of air allows sand to flow like a liquid.

    By Davide Castelvecchi
  4. Materials Science

    Allergy Nanomedicine: Buckyballs dampen response of cells that trigger allergic reactions

    Drugs based on soccer ball–shaped carbon molecules could one day help fight allergies.