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1874 – The Sholes and Glidden typewriter , the first commercially successful typewriter, goes on sale.
1900 – The first Zeppelin flight takes place on Lake Constance near Friedrichshafen, Germany.
1969 – The biggest explosion in the history of rocketry ,occurs when the Soviet N-1 rocket explodes, destroying its launchpad.
2005 – The Deep Impact collider,hits the comet Tempel 1.
1937 – Spam ,the luncheon meat, is introduced into the market by the Hormel Foods Corporation.
1885 – Louis Pasteur successfully tests his vaccine against rabies The patient is Joseph Meister, a boy who was bitten by a rabid dog.
1930– Industrialist Henry J. Kaiser begins construction of the Boulder Dam (now known as Hoover Dam) .
2011 – Space Shuttle Atlantis , is launched in the final mission of the U.S. Space Shuttle program.
1962 – The The Starfish Prime high-altitude nuclear test, is conducted by the U.S.A.
1997 – In London scientists report the findings of the DNA analysis of a Neanderthal skeleton which supports the"out of Africa theory" of human evolution, placing an "African Eve" at 100,000 to 200,000 years ago.
1893 – The first cultured pearl is obtained by Kokichi Mikimoto.
1493 – Hartmann Schedel's Nuremberg Chronicle, one of the best-documented early printed books, is published.
1923 – The Hollywood sign is officially dedicated in the hills above Hollywood, Los Angeles. It originally reads "Hollywoodland " but the four last letters are dropped after renovation in 1949.
1960 - Jane Goodall arrives at the Gombe Stream Reserve in present-day Tanzania to begin her famous study of chimpanzees in the wild.
1910 – In his book Clinical Psychiatry, Emil Kraepelin gives a name to Alzheimer's disease,, naming it after his colleague Alois Alzheimer.
1880 – Emily Stowe becomes the first female physician licensed to practice medicine in Canada.
1938 – Douglas Corrigan takes off from Brooklyn to fly the "wrong way" to Ireland and becomes known as "Wrong Way" Corrigan.
1966 – Human spaceflight: Gemini 10 is launched from Cape Kennedy on a 70-hour mission that includes docking with an orbiting Agena target vehicle.
1983– The first first three-dimensional reconstruction of a human head in a CT is published.
1807 – Nicéphore Niépce is awarded a patent by Napoleon Bonaparte for the Pyréolophore, the world's first internal combustion engine , after it successfully powered a boat in France.
1969 – Space Race: Neil Armstrong and Edwin "Buzz" Aldrin become the first humans to walk on the Moon, during the Apollo 11 mission (July 20 in North America).
1894 – The first ever motorized racing event is held in France between the cities of Paris and Rouen. The race is won by Comte Jules-Albert de Dion.
1995 – Comet Hale-Bopp is discovered; it will become visible to the naked eye nearly a year later.
1950 – Cape Canaveral Air Force Station begins operations with the launch of a Bumper rocket .
1976 – Viking 1 takes the famous photo Face on Mars .
1963 – Syncom 2 , the world's first geosynchronous satellite, is launched from Cape Canaveral on a Delta B booster.
1987 – RMS Titanic, Inc. begins the first expedited salvage of wreckage of the RMS Titanic.
1996 – The remains of a prehistoric man are discovered near Kennewick, Washington. Such remains will be known as the Kennewick Man .
1836 – Inauguration of the Arc de Triomphe in Paris.
1962 – The Trans-Canada Highway , the largest national highway in the world, is officially opened.
1790 – The very first U.S. patent is issued to inventor Samuel Hopkins for a potash process .