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MAY 31

1744 Richard Lovell Edgeworth (English Inventor) English Scientists & Mathematicians Inventors and Inventions Center for the Study of Technology and Society
1819 William W. Mayo (English-American Physician Who Founded the Mayo Clinic in Rochester, Minnesota) English Scientists & Mathematicians Rochester, Minnesota Health Care Mayo Clinic Minnesota Historical Society
1872 Charles Abbot (New Hampshire-born Astrophysicist) New Hampshire Scientists & Mathematicians Astronomy and Space
1912 Martin Schwarzschild (German-American Astrophysicist) German Scientists & Mathematicians Astronomy and Space Sonoma State University
1941 Louis J. Ignarro (New York City-born Pharmacologist; 1998 Nobel Laureate in Physiology or Medicine) Louis J. Ignarro Medical Research The Heart 1998 Nobel Laureate in Physiology or Medicine
Deaths
Persons of Historic Significance Who Have Died on This Date
1910 Elizabeth Blackwell (English-American Physician: First Woman to Obtain a Medical Degree in the United States) Elizabeth Blackwell Medicine Education Women
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1578 Laborers Accidentally Discover Ancient Subterranean Roman Cemetery/Catacombs Roman Empire Archaeology Catholic Encyclopedia
1870 Edward Joseph De Smedt of New York City Receives Two Patents for His Invention of Asphalt New York City Scientists and Inventors Inventors and Inventions Transportation Patents and Trademarks History Channel
1889 Heavy Rains Collapse the South Fork Dam Allowing Lake Conemaugh to Flood Johnstown, Pennsylvania, Killing 2,209 Johnstown, Pennsylvana Dams Flooding Death History Channel New York Times
Central Iowa Suffers Its Latest Killing Frost on Record Iowa Temperature Weather State Historical Society of Iowa
1892 The Trademark for Lea & Perrins Worchestershire Sauce Is Registered Lea & Perrins Worchestershire Sauce Trademarks and Patents USPTO
1897 5.6 Magnitude Earthquake in Giles County, Virginia Is Largest in State's Recorded History Giles County, Virginia Earthquakes USGS
1898 William Ramsay and Morris Travers Discover the Element Krypton William Ramsay Morris Travers Krypton Royal Society of Chemistry
1917 7.9 Magnitude Earthquake Is Centered on Shumagin Islands, Alaska Alaska Earthquakes USGS
1934 Temperatures Reach 108F in Minnesota Minnesota Temperatures Minnesota Historical Society
1937 English Patent Is Issued to Robert Watson-Watt for His Invention of RADAR English Scientists and Inventors RADAR Patents Inventors & Inventions European Patent Office
1946 5.9 Magnitude Earthquake Results in 840 to 1,300 Deaths and the Destruction of Several Turkish Villages Turkey Earthquakes Death USGS
1959 South African Farm Workers Begin National Potato Boycott South Africa Farming & Agriculture Labor Job Actions South African History
1968 The First Canadian Heart Transplant Is Performed Canada Health Care Heart Transplants Historic Firsts CBC
1970 7.9 Magnitude Earthquake Kills 50,000, Creating Avalanche That Buries the 20,000 Person Town of Yungay Peru Earthquakes Death USGS
1977 The trans-Alaska Oil Pipeline Is Completed After Three Years of Construction Alaska Energy Business trans-Alaska Oil Pipeline New York Times Alaska Historical Society
1994 The U.S. Announces It Is No Longer Aiming Long-Range Nuclear Missiles at Targets in the Former Soviet Union. Soviet Union Nuclear Weapons Cold War New York Times

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