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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. United States fifty-dollar bill - Wikipedia

    en.wikipedia.org/wiki/United_States_fifty-dollar...

    The United States fifty-dollar bill (US$50) is a denomination of United States currency.The 18th U.S. president (1869-1877), Ulysses S. Grant, is featured on the obverse, while the U.S. Capitol is featured on the reverse.

  4. ZX Spectrum character set - Wikipedia

    en.wikipedia.org/wiki/ZX_Spectrum_character_set

    However, the ZX Spectrum's standard character set does not include the ZX80/81 50% dithered 1×2 block graphics characters. Code points 0x90–0xA4 contain the originally 21 User-Defined Graphics (UDG) characters, and 0xA5–0xFF contain BASIC keywords tokenized as single code points.

  5. Free-piston linear generator - Wikipedia

    en.wikipedia.org/wiki/Free-piston_linear_generator

    The free-piston engine linear generators can be divided in 3 subsystems: [1] [2] One (or more) reaction section with a single or two opposite pistons; One (or more) linear electric generator, which is composed of a static part (the stator) and a moving part (the magnets) connected to the connection rod.

  6. Gray card - Wikipedia

    en.wikipedia.org/wiki/Gray_card

    A primary use of gray cards is to provide a standard reference object for exposure determination in photography. A gray card is an (approximate) realization of a Lambertian scatterer; its apparent brightness (and exposure determination) therefore depends only on its orientation relative to the light source.

  7. Guyana - Wikipedia

    en.wikipedia.org/wiki/Guyana

    The discovery of over 11 billion barrels of oil reserves off the coast of Guyana since 2017 is the largest addition to global oil reserves since the 1970s. [17] Guyana is now ranked as having the fourth-highest GDP per capita in the Americas after the United States , Canada , and The Bahamas , and has been one of the countries with the most ...

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