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DECEMBER 21

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Winter Solstice
(The shortest day of the year in the Northern Hemisphere)
Winter Solstice
1773 Robert Brown (Scottish Scientists, First to Observe Brownian Motion Between Fine Particles in Liquid) Robert Brown Botany Cells Physics
1890 Hermann Joseph Muller (New York City-born 1946 Nobel Laureate for Physiology or Medicine) New York City Scientists & Mathematicians Radiation 1946 Nobel Laureate for Physiology or Medicine
Deaths
Persons of Historic Significance Who Have Died on This Date
1824 James Parkinson (English Physician Who First Identified the Symptoms of Parkinson's Disease) English Scientists & Mathematicians Parkinson's Disease
1973 Nikolaas Tinbergen (Dutch 1973 Nobel Laureate in Physiology or Medicine) Dutch Scientists & Mathematicians Birds 1973 Nobel Laureate in Physiology or Medicine
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1807 The Fourier Series Is First Introduced at the Paris Institute Paris Calculus Historic Firsts University of St. Andrews
1812 7.1 Magnitude Earthquake Is Centered Near California's Santa Barbara Channel California Earthquake USGS
1872 H.M.S. Challenger Leaves England on World's First Scientific Voyage Challenger Expedition Naval History History of Science Historic Firsts University of California San Diego
1898 Pierre and Marie Curie Discover Radium Marie Curie Pierre Curie Radium Radiation New York Times
1906 In Alaska, the First Message Is Sent Via a Submarine Cable Between Juneau and Wrangell Alaska Telegraph Historic Firsts Alaska Historical Society
1932 7.2 Magnitude Earthquake in South Central Nevada Felt in California and Utah Nevada California Utah Earthquake USGS
1938 A Coelacanth, a Fish Through to be Extinct, Is Caught Along the Coast of South Africa South Africa Coelacanth South African History Online
1962 U.S. Agrees to Sell Nuclear Missiles to Great Britain Great Britain Nuclear Weapons Cold War BBC
1963 NASA Launches TIROS 8 Satellite to Improve Televised Cloudcover Images Space Exploration Clouds NASA
1967 7.0 Magnitude Earthquake Kills One in Northern Chile Chile Earthquake Death USGS
1968 Apollo 8 Launched as First-Manned Flight to Orbit the Moon Space Exploration Lunar Exploration Historic Firsts History Channel NASA
1988 Three Soviet Astronauts Return to Earth After One year in Space Aboard Soyuz TM-4 Russian Space Program Space Exploration Historic Firsts Society and Technology
2000 The State of Delaware Adds a Protected Zone of 5,800 Acres Around the Nanticoke River Area Delaware Rivers Earth and Enivronmental Science State of Delaware

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