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  1. Humans

    Fishing curbs can lead to profit

    New economic models suggest that fishing crews that cut back long enough to let stocks rebound will find compensation in higher profits later.

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  2. Macho pheromones rile fellows

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

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  3. Physics

    Airy theory, but true

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

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  4. Math

    Tied Up in Knots

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