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1753 Publication of Species Plantarum by Linnaeus, and the formal start date of plant taxonomy adopted by the International Code of Botanical Nomenclature.
1952 The world's first jetliner, the De Havilland Comet sets off from London to Johannesburg on its maiden flight
2000 – The sport of geocaching begins, with the first cache placed and the coordinates from a GPS posted on Usenet.
1972 The Don't Make A Wave Committee , a fledgling environmental organization founded in Canada in 1971, officially changes its name to "Greenpeace Foundation".
1925 John Thomas Scopes, a teacher in Tennessee, is charged for violating the Butler Act, which prohibited the teaching of evolution. He was tried in a case known as the Scopes Trial.
International Compost Awareness Week May 5-13
1937 Hindenburg disaster: The German zeppelin Hindenburg catches fire and is destroyed within a minute while attempting to dock in New Jersey, USA. Thirty-six people are killed.
1952 The concept of the integrated circuit the basis for all modern computers,is first published by Geoffrey W.A. Dummer .
1976 The rollercoaster Revolution, the first steel coaster with a vertical loop, opens at Six Flags Magic Mountain in California.
1882 The stethoscope is patented
1960 The nuclear submarine USS Triton , completes Operation Sandblast , the first underwater circumnavigation of the earth.
1924 Mercedes-Benz is formed by Gottlieb Daimler and Karl Benz merging their two companies.
1820 Florence Nightingale , the founder of modern nursing, is born
1880 Thomas Edison performs the first test of his electric railway.
1973 Skylab ,the United States' first space station is launched.
1618 Johannes Kepler confirms his previously rejected discovery of the third law of planetary motion .
1960 Theodore Maiman operates the first optical laser at Hughes Research Laboratories in California.
World Information Society Day
1980 Mount St. Helens erupts in Washington State, USA - GEOGRAPHY4KIDS: Volcanoes
1961 The 'Venera program' begins with Venera 1 , the first man-made object to fly-by another planet by passing Venus (the probe had lost contact with Earth a month earlier and did not send back any data).
World Metrology Day
1927 Charles Lindbergh becomes the first person to fly solo across the Atlantic Ocean
1932 Amelia Earhart becomes the first woman to fly solo across the Atlantic Ocean
International Day for Biological Diversity - 2012: Marine Biodiversity
World Turtle Day
1883 Brooklyn Bridge, the first steel-wire suspension bridge, opens after 14 years of construction.
1961 A formal announcement of a lunar landing is made by U.S. President John F. Kennedy.
1903 Granville T. Woods receives a patent for technology related to trains and electricity. His most noted invention was a system for letting the engineer of a train know how close his train was to others.
1937 – The Golden Gate Bridge opens in San Francisco, California.
585 BC A solar eclipse occurs, as predicted by Greek philosopher and scientist Thales, during the Battle of the Eclipse, leading to a truce. This is one of the cardinal dates from which other dates can be calculated.
1953 Edmund Hillary and Tenzing Norgay are the first to climb to the top of Mount Everest
1832 The Rideau Canal connecting Ottawa and Kingston is opened.
1997 The 12.9 km Confederation Bridge opens connecting PEI and New Brunswick.