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  2. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    The standard deviation σ of X is defined as which can be shown to equal. Using words, the standard deviation is the square root of the variance of X . The standard deviation of a probability distribution is the same as that of a random variable having that distribution. Not all random variables have a standard deviation.

  3. Euro sign - Wikipedia

    en.wikipedia.org/wiki/Euro_sign

    The euro sign ( €) is the currency sign used for the euro, the official currency of the eurozone and adopted, although not required to, by Kosovo and Montenegro. The design was presented to the public by the European Commission on 12 December 1996. It consists of a stylized letter E (or epsilon ), crossed by two lines instead of one.

  4. Tuberculosis - Wikipedia

    en.wikipedia.org/wiki/Tuberculosis

    Tuberculosis ( TB ), also known colloquially as the " white death ", or historically as consumption, [7] is an infectious disease usually caused by Mycobacterium tuberculosis (MTB) bacteria. [1] Tuberculosis generally affects the lungs, but it can also affect other parts of the body. [1] Most infections show no symptoms, in which case it is ...

  5. Gilded Age - Wikipedia

    en.wikipedia.org/wiki/Gilded_Age

    e. In United States history, the Gilded Age is described as the period from about the 1870s to the late 1890s, which occurred between the Reconstruction Era and the Progressive Era. It was named after an 1873 Mark Twain novel by historians in the 1920s who saw this interval of economic expansion as an era of materialistic excesses combined with ...

  6. United States in the Vietnam War - Wikipedia

    en.wikipedia.org/wiki/United_States_in_the...

    t. e. United States involvement in the Vietnam War began shortly after the end of World War II in Asia, first in an extremely limited capacity and escalating over a period of 20 years. The U.S. military presence peaked in April 1969, with 543,000 American military personnel stationed in Vietnam. [1] By the conclusion of the United States's ...

  7. Boeing 707 - Wikipedia

    en.wikipedia.org/wiki/Boeing_707

    The 707 was based on the 367-80 "Dash 80" The six-abreast cabin. During and after World War II, Boeing was known for its military aircraft. The company had produced innovative and important bombers, from the B-17 Flying Fortress and B-29 Superfortress to the jet-powered B-47 Stratojet and B-52 Stratofortress, but its commercial aircraft were not as successful as those from Douglas Aircraft and ...