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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. 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.

  4. Internet of things - Wikipedia

    en.wikipedia.org/wiki/Internet_of_things

    Connected Home over IP (or Project Connected Home over IP) is an open-sourced, royalty-free home automation connectivity standard project which features compatibility among different smart home and Internet of things (IoT) products and software

  5. Reactions to the 1989 Tiananmen Square protests and massacre

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

    Yan Xiaoqiao, a PhD chemistry student enrolled in Simon Fraser University, said "today is one of the darkest days in Chinese history". [74] Many of the Chinese foreign exchange students studying in Canada opted to apply for permanent residency in the aftermath of 4 June rather than return to China. [81]