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  2. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.

  3. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    In 1629, Isaac Beeckman proposed an experiment in which a person observes the flash of a cannon reflecting off a mirror about one mile (1.6 km) away. In 1638, Galileo Galilei proposed an experiment, with an apparent claim to having performed it some years earlier, to measure the speed of light by observing the delay between uncovering a lantern ...

  4. Mikhail Gorbachev - Wikipedia

    en.wikipedia.org/wiki/Mikhail_Gorbachev

    t. e. Mikhail Sergeyevich Gorbachev [f] [g] (2 March 1931 – 30 August 2022) was a Soviet and Russian politician who served as the last leader of the Soviet Union from 1985 to the country's dissolution in 1991. He served as General Secretary of the Communist Party of the Soviet Union from 1985 and additionally as head of state beginning in ...

  5. Saving Private Ryan - Wikipedia

    en.wikipedia.org/wiki/Saving_Private_Ryan

    Saving Private Ryan is a 1998 American epic war film directed by Steven Spielberg and written by Robert Rodat.Set in 1944 in France during World War II, it follows a group of soldiers, led by Captain John Miller (), on their mission to locate Private James Francis Ryan and bring him home safely after his three brothers are killed in action.

  6. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    Stock A over the past 20 years had an average return of 10 percent, with a standard deviation of 20 percentage points (pp) and Stock B, over the same period, had average returns of 12 percent but a higher standard deviation of 30 pp. On the basis of risk and return, an investor may decide that Stock A is the safer choice, because Stock B's ...

  7. Mexico - Wikipedia

    en.wikipedia.org/wiki/Mexico

    Mexico, [a] [b] officially the United Mexican States, [c] is a country in the southern portion of North America. It covers 1,972,550 km 2 (761,610 sq mi), [11] making it the world's 13th-largest country by area; with a population of almost 130 million, it is the 10th-most-populous country and the most populous Spanish-speaking country. [12]