Chemistry
Choline is a quaternary ammonium salt with the chemical formula (CH3)3N+CH2CH2OHX−, where X− is a counterion such as chloride (see choline chloride), hydroxide or tartrate. Choline chloride can form a low-melting deep eutectic solvent mixture with urea with unusual properties. The salicylate salt is used topically for pain relief of aphthous ulcers.
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“For me chemistry represented an indefinite cloud of future potentialities which enveloped my life to come in black volutes torn by fiery flashes, like those which had hidden Mount Sinai. Like Moses, from that cloud I expected my law, the principle of order in me, around me, and in the world.... I would watch the buds swell in spring, the mica glint in the granite, my own hands, and I would say to myself: “I will understand this, too, I will understand everything.””
—Primo Levi (1919–1987)