Inventor Alan Clark was granted his patent for the telescope.
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After nearly four and a half years of cataclysmic conflict, World War I ended.
German polymath Gottfried Wilhelm Leibniz demonstrated integral calculus for the first time.
Poland became an independent country.
Danish astronomer Tycho Brahe witnessed the supernova SN 1572.
Canada's second-largest city, Montreal, started dumping untreated waste in the Saint Lawrence River.
