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  2. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

  3. 2020 United States presidential election - Wikipedia

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

    The 2020 United States presidential election was the 59th quadrennial presidential election, held on Tuesday, November 3, 2020. [a] The Democratic ticket of former vice president Joe Biden and the junior U.S. senator from California Kamala Harris defeated the incumbent Republican president, Donald Trump, and vice president, Mike Pence. [9]

  4. Virginia's 10th congressional district - Wikipedia

    en.wikipedia.org/wiki/Virginia's_10th...

    January 25, 1830 – March 3, 1833 21st 22nd: Elected in 1829 to finish Rives's term and seated January 25, 1830. Re-elected in 1831. Redistricted to the 12th district. Joseph W. Chinn : Jacksonian: March 4, 1833 – March 3, 1835 23rd: Elected in 1833. Lost re-election. John Taliaferro (Fredericksburg) Anti-Jacksonian: March 4, 1835 – March ...

  5. Hydrochloric acid - Wikipedia

    en.wikipedia.org/wiki/Hydrochloric_acid

    Hydrochloric acid has been used for dissolving calcium carbonate, e.g. such things as de-scaling kettles and for cleaning mortar off brickwork. When used on brickwork the reaction with the mortar only continues until the acid has all been converted, producing calcium chloride , carbon dioxide , and water:

  6. Hydrocodone - Wikipedia

    en.wikipedia.org/wiki/Hydrocodone

    It is well-absorbed, but the oral bioavailability of hydrocodone is only approximately 25%. [ 4 ] [ 5 ] The onset of action of hydrocodone via this route is 10 to 20 minutes, with a peak effect ( T max ) occurring at 30 to 60 minutes, [ 51 ] and it has a duration of 4 to 8 hours. [ 2 ]

  7. Konami Code - Wikipedia

    en.wikipedia.org/wiki/Konami_Code

    The code is also known as the "Contra Code" and "30 Lives Code", since the code provided the player 30 extra lives in Contra. The code has been used to help novice players progress through the game. [10] [12] The Konami Code was created by Kazuhisa Hashimoto, who was developing the home port of the 1985 arcade game Gradius for the NES.