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APRIL 4

1821 Linus Yale (New York-born Inventor) Linus Yale Inventors & Inventions
1823 Carl Wilhelm (William) Siemens (German-English Electrical Engineer and Inventor ) German Scientists and Inventors Inventors & Inventions Electricity Telegraph Technology and Society
Deaths
Persons of Historic Significance Who Have Died on This Date
1617 John Napier (Scottish Inventor of Logarithms) John Napier Mathematics
1914 Frederick E. Weyerhaeuser (German-born Pioneer of the American Timber Industry; Founder of Weyerhaeuser Company) German Business Leaders Trees Business Weyerhaeuser
1923 John Venn (English Mathematician: Namesake of Venn Diagrams) John Venn Mathematics
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1689 Spanish Explorer, Alonso De León, Names the Texas' Río de las Nueces for the Pecan Trees Along Its Banks Spanish Explorers Texas Explorers of North America Rivers Trees Texas State Historical Association
1905 8.6 Magnitude Earthquake Killing 19,000+ in the Kangra District Is Deadliest in India's Recorded History India Earthquakes Death Geological Survey of India (pdf) U.S. Geological Survey
1932 Vitamin C Is First Isolated by C.C. King, University of Pittsburgh Pennsylvania Biochemistry Vitamins & Supplements National Dairy Council
1933 U.S. Dirigible Akron Crashes in a Violent Storm Off New Jersey Coast: 73 Die New Jersey Aviation Death U.S. Navy
1968 NASA Launches Unmanned Apollo 6 Rocket Space Exploration Lunar Exploration NASA
1969 Dr. Denton Cooley Implants First Temporary Artificial Heart The Heart Medical Research Historic Firsts Texas State Historical Association
1974 Hank Aaron Hits Home Run #714 to Tie Babe Ruth Hank Aaron Babe Ruth Baseball Hall of Fame Baseball Almanac New York Times University of Georgia
Two-Day Outbreak of 148 Tornadoes Across 13 States and Canada Kill 148, Injure 6,142, Causing $600 Million in Property Damage Canada Alabama Georgia Illinois Indiana Kentucky Mississippi Ohio Tornadoes Deaths Weather Channel
Tornadoes Kill 16 and Injure 109 in Northwest Georgia Georgia Tornadoes Deaths University of Georgia
Tornadoes Kill 86 and Injure 949 in Alabama Alabama Tornadoes Deaths Alabama State Archive
1983 Challenger First Launched on the 6th Space Shuttle Mission Space Shuttle NASA
1988 Georgia Designates the Tiger Swallowtail as the State's Official Butterfly State of Georgia Tiger Swallowtail University of Georgia
1997 NASA Launches Space Shuttle Challenger (STS-39A) with Microgravity Lab Space Shuttle Gravity NASA
2000 Severe Weather Creates Chaos in Great Britain Great Britain Snow BBC
2010 7.2 Magnitude Earthquake Kills 2 in Mexico, Shakes Buildings in Southwest U.S. on Easter Sunday Mexico Arizona California Earthquakes Easter Death USGS

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