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1804 in science
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==Deaths== * February 6 – [[Joseph Priestley]], English chemist (born [[1733 in science|1733]]) * March 26 – [[Wolfgang von Kempelen]], [[Hungarians|Hungarian]] inventor (born [[1734 in science|1734]]) * August 30 – [[Thomas Percival]], English reforming physician and medical ethicist (born [[1740 in science|1740]]) * September 20 – [[Pierre Méchain]], French astronomer (born [[1744 in science|1744]]) * October 2 – [[Nicolas-Joseph Cugnot]], French mechanical engineer (born [[1725 in science|1725]]) * November 5 – [[Louis Lépecq de La Clôture]], French epidemiologist (born [[1736 in science|1736]])<ref name="BNF">{{cite web |url= https://data.bnf.fr/fr/17791340/louis_lepecq_de_la_cloture/|title=Louis Lépecq de La Clôture (1736-1804) |website=data.bnf.fr |publisher=BNF |access-date=21 October 2020}}</ref>
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