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  2. September 21 - Wikipedia

    en.wikipedia.org/wiki/September_21

    [1] 1170 – Anglo-Norman invasion of Ireland: The Kingdom of Dublin falls to Anglo-Norman invaders. [2] 1217 – Livonian Crusade: The Estonian leader Lembitu and Livonian leader Caupo of Turaida are killed in the Battle of St. Matthew's Day. [3] 1435 – The Treaty of Arras is promulgated, causing Burgundy to switch sides in the Hundred Years ...

  3. Linux kernel - Wikipedia

    en.wikipedia.org/wiki/Linux_kernel

    The Linux kernel is a free and open source, [12]: 4 Unix-like kernel that is used in many computer systems worldwide. The kernel was created by Linus Torvalds in 1991 and was soon adopted as the kernel for the GNU operating system (OS) which was created to be a free replacement for Unix.

  4. Look-and-say sequence - Wikipedia

    en.wikipedia.org/wiki/Look-and-say_sequence

    1 is read off as "one 1" or 11. 11 is read off as "two 1s" or 21. 21 is read off as "one 2, one 1" or 1211. 1211 is read off as "one 1, one 2, two 1s" or 111221. 111221 is read off as "three 1s, two 2s, one 1" or 312211. The look-and-say sequence was analyzed by John Conway [1] after he was introduced to it by one of his students at a party. [2 ...

  5. Aspect ratio (image) - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio_(image)

    DVD producers can also choose to show even wider ratios such as 1.66:1, 1.75:1, 1.77:1 and 1.78:1 [1] within the 16:9 DVD frame by hard matting or adding black bars within the image itself. The 16:9 aspect ratio was used often in British TVs in the United Kingdom in the 1990s, and is also used in smartphones, laptops, and desktops.

  6. OTR-21 Tochka - Wikipedia

    en.wikipedia.org/wiki/OTR-21_Tochka

    Its NATO reporting name is the SS-21 Scarab. One missile is transported per 9P129 vehicle and raised prior to launch. One missile is transported per 9P129 vehicle and raised prior to launch. It uses an inertial guidance system.

  7. 2020 United States presidential election - Wikipedia

    en.wikipedia.org/wiki/2020_United_States...

    Howie Hawkins became the presumptive nominee of the Green Party on June 21, 2020, and was officially nominated by the party on July 11, 2020. [ 67 ] [ 68 ] Hawkins secured ballot access in 29 states and the District of Columbia, representing 381 electoral votes, and write-in access in 16 more states, representing 130 electoral votes.

  8. Wayback Machine - Wikipedia

    en.wikipedia.org/wiki/Wayback_Machine

    The Internet Archive began archiving cached web pages in 1996. One of the earliest known pages was archived on May 10, 1996, at 2:08 p.m. (). [5]Internet Archive founders Brewster Kahle and Bruce Gilliat launched the Wayback Machine in San Francisco, California, [6] in October 2001, [7] [8] primarily to address the problem of web content vanishing whenever it gets changed or when a website is ...