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1840 (MDCCCXL) was a leap year starting on Wednesday (link will take you to calendar).
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Events
January 10 - Uniform penny postage introduced in the UK.
May 7 - The Great Natchez Tornado: A massive tornado strikes Natchez, Mississippi during the early afternoon hours. Before it was over, 317 people had lost their lives and 209 were injured. It is the second deadliest tornado in U.S. history.
September 10 - Ottoman and British troops bombard Beirut and land troops on the coast to pressure Egyptian Muhammad Ali to retreat from the country.
Louis Agassiz publishes his work in two volumes entitled Etudes sur les glaciers ("Study on Glaciers"), the first major work to scientifically propose that the Earth has been subject to a past ice age.
Punch caricature magazine begins publication.
Pedro II is declared "of age" prematurely and begins to reassert central control in Brazil.
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Births
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Deaths
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