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  2. Free Negro - Wikipedia

    en.wikipedia.org/wiki/Free_Negro

    The life expectancy of slaves was much higher in the Thirteen Colonies than in Latin America, the Caribbean or Brazil. [vague] [citation needed] This, combined with a very high birth rate, meant that the number of slaves grew rapidly, as the number of births exceeded the number of deaths, reaching nearly 4 million by the time of the 1860 United States census. [6]

  3. Six Degrees of Kevin Bacon - Wikipedia

    en.wikipedia.org/wiki/Six_Degrees_of_Kevin_Bacon

    The computation of a Bacon number for actor X is a "shortest path" algorithm, applied to the co-stardom network: Kevin Bacon himself has a Bacon number of 0. Actors who have worked directly with Kevin Bacon have a Bacon number of 1. If the lowest Bacon number of any actor with whom X has appeared in any movie is N, X's Bacon number is N+1.

  4. Blue box - Wikipedia

    en.wikipedia.org/wiki/Blue_box

    To operate a blue box, the user placed a long-distance telephone call, often to a number that was in the target area. Usually, this initial call would be to a 1-800 number or some other non-supervising telephone number such as directory assistance. [12] Using a toll-free number ensured that the phone being used for access would not be billed.

  5. Mischling Test - Wikipedia

    en.wikipedia.org/wiki/Mischling_Test

    Mischling Test refers to the legal test under Nazi Germany's Nuremberg Laws that was applied to determine whether a person was considered a "Jew" or a Mischling ...

  6. Number sign - Wikipedia

    en.wikipedia.org/wiki/Number_sign

    The symbol # is known variously in English-speaking regions as the number sign, [1] hash, [2] or pound sign. [3] The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔.

  7. Universal Product Code - Wikipedia

    en.wikipedia.org/wiki/Universal_Product_Code

    A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...

  8. Nuclear weapons testing - Wikipedia

    en.wikipedia.org/wiki/Nuclear_weapons_testing

    The nuclear powers have conducted more than 2,000 nuclear test explosions (numbers are approximate, as some test results have been disputed): United States : 1,054 tests by official count (involving at least 1,149 devices). 219 were atmospheric tests as defined by the CTBT .

  9. Test and learn - Wikipedia

    en.wikipedia.org/wiki/Test_and_learn

    Test and learn has been systematically applied as far back as 1988 by Capital One.Capital One has been aggressive about testing since the firm was founded, testing everything from product design to marketing to customer selection to collection policies. [1]