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  2. 2,4-Dichlorophenoxyacetic acid - Wikipedia

    en.wikipedia.org/wiki/2,4-Dichlorophenoxyacetic_acid

    2,4-Dichlorophenoxyacetic acid is an organic compound with the chemical formula Cl 2 C 6 H 3 OCH 2 CO 2 H.It is usually referred to by its ISO common name 2,4-D. [4] It is a systemic herbicide that kills most broadleaf weeds by causing uncontrolled growth, but most grasses such as cereals, lawn turf, and grassland are relatively unaffected.

  3. Close-quarters battle - Wikipedia

    en.wikipedia.org/wiki/Close-quarters_battle

    The Battle of Spotsylvania Court House took place between 9 and 21 May 1864 during the American Civil War.The men of the Northern and Southern armies were periodically forced into a bloody hand-to-hand struggle reminiscent of ancient battles, with the men using swords, knives, bayonets, and even with sticks and bare hands.

  4. Q–Q plot - Wikipedia

    en.wikipedia.org/wiki/Q–Q_plot

    QQ plot for first opening/final closing dates of Washington State Route 20, versus a normal distribution. [5] Outliers are visible in the upper right corner. A QQ plot is a plot of the quantiles of two distributions against each other, or a plot based on estimates of the quantiles.