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22 hours ago · Signature. Sir Isaac Newton FRS (25 December 1642 – 20 March 1726/27 [ a ]) was an English polymath active as a mathematician, physicist, astronomer, alchemist, theologian, and author who was described in his time as a natural philosopher. [ 7 ] He was a key figure in the Scientific Revolution and the Enlightenment that followed.
22 hours ago · Obsessive–compulsive disorder (OCD) is a mental and behavioral disorder in which an individual has intrusive thoughts (an obsession) and feels the need to perform certain routines (compulsions) repeatedly to relieve the distress caused by the obsession, to the extent where it impairs general function. [1][2][7] Obsessions are persistent ...
