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April 22, 1969 British yachtsman Sir Robin Knox-Johnston completed the first solo non-stop circumnavigation of the world in his 32-foot sailboat Suhaili.

April 22, 1889 The Oklahoma Land Run of 1889 began at high noon. An estimated 50,000 Americans lined up for their piece of the available 2 million acres of unassigned lands. By the end of the day, both Oklahoma City and Guthrie had established cities of around 10,000 people.

April 23, 1858 German physicist Max Planck was born in Kiel. He originated quantum theory, which won him the Nobel Prize for Physics in 1918. It revolutionized our understanding of atomic and subatomic processes, and is one of the fundamental theories of 20th-century physics

April 25, 1959 The St. Lawrence Seaway was officially opened. It is a system of rivers, locks, canals and channels in Eastern Canada and Northern United States that permits oceangoing vessels to travel from the Atlantic Ocean to the Great Lakes of North America.

April 30, 1803 An American delegation, led by Robert Livingston, signed the Louisiana Purchase Treaty with France. The USA purchased the entire Louisiana Territory for $15 million.

April 30, 1504 Italian artist Francesco Primaticcio was born in Bologna. He was a Mannerist painter, architect and sculptor, grouped with the so-called "First School of Fontainebleau" centered on the royal Palace of Fontainebleau, during the late French Renaissance.

May 1, 1949 Dutch-American astronomer Gerard Kuiper discovered Nereid, the third-largest moon of Neptune.

May 1, 1931 The Empire State Building in New York City was officially opened. President Herbert Hoover turned on the building's lights with the push of a button from Washington, D.C. It was the world's tallest building from 1931 to 1973.

May 4, 1655 Italian instrument maker Bartolomeo Cristofori was born in Padua in the Republic of Venice. He was recruited by the de Medici family to work as an inventor and instrument maker, and is credited with being the inventor of the piano.

May 18, 1958 A United States Air Force F-104A Starfighter set a world speed record of 2,259.82 km/h (1,404.19 mph).

May 18, 1897 Irish author Bram Stoker first published Dracula. It was his fifth and by far his most famous novel.

May 19, 1593 Flemish Baroque painter Jacob Jordaens was born in Antwerp. He painted altarpieces, mythological, and allegorical scenes, and is best-known today for his numerous large genre scenes based on proverbs.

May 21, 1927 Charles Lindbergh completed the first solo non-stop flight across the Atlantic Ocean. He flew from Long Island to Le Bourget Field in Paris, France, a distance of nearly 3,600 statute miles in the single-seat, single-engine monoplane "Spirit of St. Louis".

May 24, 1962 NASA launched the Mercury-Atlas 7 manned space mission, piloted by astronaut Scott Carpenter. The Mercury spacecraft was named "Aurora 7" and made three earth orbits in about 5 hours.

May 25, 1085 Alfonso VI of Castile took the city of Toledo back from the Moors, and ended the mediaeval Taifa's Kingdom of Toledo. This was the first concrete step taken by the combined kingdom of Leon-Castile in the Reconquista by Christian forces.

May 28, 1930 Construction was completed on the Chrysler Building in New York City. It was the first man-made structure to stand taller than 1,000 feet, and was the world's tallest structure until the Empire State Building was completed one year later.