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  2. Amino acid - Wikipedia

    en.wikipedia.org/wiki/Amino_acid

    The 21 proteinogenic α-amino acids found in eukaryotes, grouped according to their side chains' pK a values and charges carried at physiological pH (7.4) 2-, alpha-, or α-amino acids [21] have the generic formula H 2 NCHRCOOH in most cases, [b] where R is an organic substituent known as a "side chain". [22]

  3. AP Precalculus - Wikipedia

    en.wikipedia.org/wiki/AP_Precalculus

    Advanced Placement (AP) Precalculus (also known as AP Precalc) is an Advanced Placement precalculus course and examination, offered by the College Board, in development since 2021 [1] and announced in May 2022. [2]

  4. Plate tectonics - Wikipedia

    en.wikipedia.org/wiki/Plate_tectonics

    Plate tectonics (from Latin tectonicus, from Ancient Greek τεκτονικός (tektonikós) 'pertaining to building') [1] is the scientific theory that the Earth's lithosphere comprises a number of large tectonic plates, which have been slowly moving since 3–4 billion years ago.

  5. Avicenna - Wikipedia

    en.wikipedia.org/wiki/Avicenna

    Ibn Sina (Persian: ابن سینا, romanized: Ibn Sīnā; c. 980 – 22 June 1037), commonly known in the West as Avicenna (/ ˌ æ v ɪ ˈ s ɛ n ə, ˌ ɑː v ɪ-/), was a preeminent philosopher and physician of the Muslim world, [4] [5] flourishing during the Islamic Golden Age, serving in the courts of various Iranian rulers. [6]

  6. Umayyad state of Córdoba - Wikipedia

    en.wikipedia.org/wiki/Umayyad_state_of_Córdoba

    The Emirate of Córdoba, from 929, the Caliphate of Córdoba, was an Arab Islamic state ruled by the Umayyad dynasty from 756 to 1031. Its territory comprised most of the Iberian Peninsula (known to Muslims as al-Andalus), the Balearic Islands, and parts of North Africa, with its capital in Córdoba (at the time Qurṭubah).

  7. Internet of things - Wikipedia

    en.wikipedia.org/wiki/Internet_of_things

    Internet of things (IoT) describes devices with sensors, processing ability, software and other technologies that connect and exchange data with other devices and systems over the Internet or other communication networks.

  8. Reactions to the 1989 Tiananmen Square protests and massacre

    en.wikipedia.org/wiki/Reactions_to_the_1989...

    As Louisa Lim notes in her book, The People's Republic of Amnesia: Tiananmen Revisited, many young Chinese know almost nothing of the Tiananmen Square protests. In an informal survey, Lim showed the iconic photo of Tank Man to 100 Chinese university students; only 15 correctly identified it as being an image of Tiananmen Square. [ 20 ]