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  2. Ion - Wikipedia

    en.wikipedia.org/wiki/Ion

    An ion (/ ˈaɪ.ɒn, - ən /) [1] is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convention. The net charge of an ion is not zero because its total number of electrons ...

  3. Twenty-fifth Amendment to the United States Constitution

    en.wikipedia.org/wiki/Twenty-fifth_Amendment_to...

    Section 2 provides a mechanism for filling a vacancy in the vice presidency. Before the Twenty-fifth Amendment, a vice-presidential vacancy continued until a new vice president took office at the start of the next presidential term; the vice presidency had become vacant several times due to death, resignation, or succession to the presidency, and these vacancies had often lasted several years.

  4. iOS version history - Wikipedia

    en.wikipedia.org/wiki/IOS_version_history

    iOS version history. iOS is a mobile operating system developed by Apple Inc. and was first released as iPhone OS in June 2007, coinciding with the launch of the first generation iPhone. [1] iPhone OS was renamed iOS following the release of the iPad, starting with iOS 4. [2] With iOS 13, Apple began offering a separate operating system, iPadOS ...

  5. Chernobyl disaster - Wikipedia

    en.wikipedia.org/wiki/Chernobyl_disaster

    The Chernobyl disaster began on 26 April 1986 with the explosion of the No. 4 reactor of the Chernobyl Nuclear Power Plant near the city of Pripyat in northern Ukraine, near the Belarus border in the Soviet Union. [1] It is one of only two nuclear energy accidents rated at the maximum severity on the International Nuclear Event Scale, the other ...

  6. Computer science - Wikipedia

    en.wikipedia.org/wiki/Computer_science

    Computer science is the study of computation, information, and automation. [1][2][3] Computer science spans theoretical disciplines (such as algorithms, theory of computation, and information theory) to applied disciplines (including the design and implementation of hardware and software). [4][5][6] Algorithms and data structures are central to ...

  7. Nineteen Eighty-Four - Wikipedia

    en.wikipedia.org/wiki/Nineteen_Eighty-Four

    The Orwell Archive at University College London contains undated notes about ideas that evolved into Nineteen Eighty-Four.The notebooks have been deemed "unlikely to have been completed later than January 1944", and "there is a strong suspicion that some of the material in them dates back to the early part of the war".

  8. Mary, mother of Jesus - Wikipedia

    en.wikipedia.org/wiki/Mary,_mother_of_Jesus

    Virgin Mary depicted by Muslim painter Hossein Nuri. In Islam, Mary is known as Maryam (Arabic: مريم, romanized: Maryam), mother of Isa (عيسى بن مريم). She is often referred to by the honorific title "Sayyidatuna", meaning "Our Lady"; this title is in parallel to "Sayyiduna" ("Our Lord"), used for the prophets. [42]