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  1. Macho pheromones rile fellows

    Pheromones that induce aggression in other male mice are found in the major urinary protein complex in the animals' urine.

    By Nathan Seppa
  2. Physics

    Airy theory, but true

    Physicists have created a beam of light that bends in a curve.

    By Davide Castelvecchi
  3. Math

    Tied Up in Knots

    Physicists have shown that tumbled strings will form surprisingly complex knots, helping explain how knots spontaneously form in nature.

    By Davide Castelvecchi
  4. Earth

    Dead Serious

    Little progress has been made this decade in reducing the size of the Gulf of Mexico's dead zone, a massive area of oxygen-depleted water caused by agricultural and urban runoff.