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  1. 19486

    In this article, it strikes me as strange to project the cost of collecting DNA samples from the “estimated 10 million animal species” on Earth when at least 90 percent of that probable fauna has yet to be discovered and, at current extinction rates, probably never will be. Kevin LumneyPorter Township, Ohio

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  2. DNA Bar Codes

    Scientists are using a small piece of DNA as a molecular bar code, a unique identifier to separate organisms into species.

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  3. Math

    Cruise Control and Traffic Flow

    Adaptive cruise control can help smooth out traffic flow.

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  4. Humans

    From the November 24, 1934, issue

    The 1934 Nobel Prize in chemistry is awarded, Jupiter's great red spot is explained, and a polar ice cap shivers in the wind.