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  2. Wayback Machine - Wikipedia

    en.wikipedia.org/wiki/Wayback_Machine

    The Wayback Machine 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 ...

  3. Reddit - Wikipedia

    en.wikipedia.org/wiki/Reddit

    Reddit ( / ˈrɛdɪt /) is an American social news aggregation, content rating, and forum social network. Registered users (commonly referred to as "Redditors") submit content to the site such as links, text posts, images, and videos, which are then voted up or down ("upvoted" or "downvoted") by other members. Posts are organized by subject ...

  4. Cyclic redundancy check - Wikipedia

    en.wikipedia.org/wiki/Cyclic_redundancy_check

    Cyclic redundancy check. A cyclic redundancy check ( CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to digital data. [ 1][ 2] Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents.

  5. Vatican City - Wikipedia

    en.wikipedia.org/wiki/Vatican_City

    1984 (8th Session) Vatican City ( / ˈvætɪkən / ⓘ ), officially the Vatican City State ( Italian: Stato della Città del Vaticano; [ f] Latin: Status Civitatis Vaticanae ), [ g][ h] is a landlocked sovereign country, [ 16][ 17] city-state, microstate, and enclave within Rome, Italy. [ 18][ 19] It became independent from Italy in 1929 with ...

  6. G20 - Wikipedia

    en.wikipedia.org/wiki/G20

    g20 .org. The G20 or Group of 20 is an intergovernmental forum comprising 19 sovereign countries, the European Union (EU), and the African Union (AU). [ 2][ 3] It works to address major issues related to the global economy, such as international financial stability, climate change mitigation and sustainable development.

  7. Carbon dioxide - Wikipedia

    en.wikipedia.org/wiki/Carbon_dioxide

    Carbon dioxide is a greenhouse gas. It absorbs and emits infrared radiation at its two infrared-active vibrational frequencies. The two wavelengths are 4.26 μm (2,347 cm −1) (asymmetric stretching vibrational mode) and 14.99 μm (667 cm −1) (bending vibrational mode).