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  2. Ocean - Wikipedia

    en.wikipedia.org/wiki/Ocean

    Of this fresh water, 68.9% is in the form of ice and permanent snow cover in the Arctic, the Antarctic and mountain glaciers; 30.8% is in the form of fresh groundwater; and only 0.3% of the fresh water on Earth is in easily accessible lakes, reservoirs and river systems.

  3. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    By definition of Stirling numbers of the second kind, the probability that exactly T draws are needed is (,)! By manipulating the generating function of the Stirling numbers, we can explicitly calculate all moments of T: ():= (,) = = In general, the k-th moment is ()!

  4. Dark matter - Wikipedia

    en.wikipedia.org/wiki/Dark_matter

    The hypothesis of dark matter has an elaborate history. [18] [19] In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, [18] Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that the Sun ...

  5. Lee Harvey Oswald - Wikipedia

    en.wikipedia.org/wiki/Lee_Harvey_Oswald

    Lee Harvey Oswald (October 18, 1939 – November 24, 1963) was a U.S. Marine veteran who assassinated John F. Kennedy, the 35th president of the United States, on November 22, 1963.

  6. The Great Wave off Kanagawa - Wikipedia

    en.wikipedia.org/wiki/The_Great_Wave_off_Kanagawa

    The Great Wave off Kanagawa is also the subject of the 93rd episode of the BBC radio series A History of the World in 100 Objects produced in collaboration with the British Museum, which was released on 4 September 2010. [86] A replica of The Great Wave off Kanagawa was created for a documentary film about Hokusai released by the British Museum ...

  7. One-drop rule - Wikipedia

    en.wikipedia.org/wiki/One-drop_rule

    The one-drop rule was a legal principle of racial classification that was prominent in the 20th-century United States. It asserted that any person with even one ancestor of black ancestry ("one drop" of "black blood") [1] [2] is considered black (Negro or colored in historical terms).

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