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Stamp depicts a generic formula for an amino acid where R stands for "radical." In organic chemistry, this nomenclature represents the possibility of any one of a series of aliphatic groups, like methyl, ethyl, propyl,…
Iranian postage stamp commemorating the 1100th birthday of Abū Bakr Muhammad ibn Zakariyyā al-Rāzī (Rhazes)
Depicts Abū Bakr Muhammad ibn Zakariyyā al-Rāzī (also known as Rhazes), a Persian polymath, physician, alchemist, and philosopher.