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1924 The Royal Canadian Air Force is formed.
1960 – The TIROS-1 satellite transmits the first television picture from space.
1975 After 40 months of construction, the CN tower is completed, becoming the world's tallest free-standing structure.
1973 Martin Cooper of Motorola made the first handheld mobile phone call although it took ten years for the DynaTAC 8000X to become the first such phone to be commercially released.
1969 Dr. Denton Cooley implants the first temporary artificial heart .
1958 Ripple Rock an underwater threat to navigation in the Seymour Narrows in Canada is destroyed in one of the largest non-nuclear controlled explosions of the time.
1980 Post-it notes are introduced
World Health Day
National Wildlife Week - is celebrated during the week that includes 10 April, the birth date of the late Jack Miner, one of the founders of Canada's conservation movement.
1959 A team of computer manufacturers, users, and university people led by Grace Hopper meets to discuss the creation of a new programming language that would be called COBOL .
1860 On his phonautograph machine Édouard-Léon Scott de Martinville makes the oldest known recording of an audible human voice.
1953 Warner Brothers premieres the first 3-D film from a major American studio, entitled House of Wax .
1970 Apollo 13 is launched from Cape Canaveral.
1955 The polio vaccine developed by Dr. Jonas Salk is declared safe and effective.
1960 The United States launches Transit 1-B the world's first satellite navigation system.
2003 The Human Genome Project is completed with 99% of the human genome sequenced to an accuracy of 99.99%.
1912 Titanic sinks off the coast of Newfoundland
1947 The term 'cold war' is used for the first time by Bernard Baruch to describe relations between the United States and the Soviet Union.
1897 The Aurora, Texas UFO incident .
1924 Simon & Schuster publishes the first crossword puzzle book.
1919 Leslie Irvin of the United States makes the first successful voluntary free-fall parachute jump using a new kind of - self-contained parachute .
1535 – The Sun dog phenomenon observed over Stockholm and depicted in the famous painting "Vädersolstavlan" .
1994 The first discoveries of extrasolar planets are announced by astronomer Alexander Wolszczan
Earth Day - Cross-Curricular Activities and Resources
1970 The first Earth Day is observed
World Book Day
1985 Coca-Cola changes its formula and releases New Coke.
2005 Snuppy, the world's first cloned dog is born in South Korea.
1959 The St. Lawrence Seaway linking the North American Great Lakes and the Atlantic Ocean, officially opens to shipping.
1986 A nuclear reactor accident occurs at the Chernobyl Nuclear Power Plant in the Soviet Union (now Ukraine), creating the world's worst nuclear disaster.
1981 Xerox PARC introduces the computer mouse .
1932 A vaccine for yellow fever is announced for use on humans.
1903 A rockslide from Turtle Mountain kills 70 people in the town of Frank, AB
1006 Supernova SN 1006 ,the brightest supernova in recorded history, appears in the constellation Lupus.