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  1. 19076

    Regarding this article, as planes fly low over the bay to land at San Francisco airport, wing vortices frequently bend down and become twin waterspouts that last up to 20 seconds. Dave GrossmanPalo Alto, Calif.

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  2. Humans

    Dangerous Wake: Wing vortices yield a deadly secret

    A new mathematical analysis of an aeronautical hazard known as wake turbulence could someday lead to improved air safety and increase the number of flights at major airports.

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  3. Health & Medicine

    Let Them Eat Cake: Altered mice stay svelte on a high-fat diet

    A protein that links gluttony and weight gain may be a novel target for antiobesity drugs.