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Avalokitesvara
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Unusual Counting Systems
Sign on Brick wall reads "1645" written in Roman numeral.
Is It Still Important to Learn Roman Numerals?
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Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere
Why Do Some Cicadas Appear Only Every 17 Years?
Ethel Rosenberg arrested in August 1950. Photograph dated Aug. 8, 1950. American civilians executed for espionage. Spies, communists, Julius Rosenberg
Spies Like Us: 10 Famous Names in the Espionage Game
Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays
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Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.
What Is the Emoluments Clause?
Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar
Ten Days That Vanished: The Switch to the Gregorian Calendar
US Marines firing at Fallujah, Iraq, during the Second Battle of Fallujah in November 2004. Operation Iraqi Freedom, Iraq War.
Timeline of the 2000s
Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.
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Key People

Diophantus
Greek mathematician
John Wallis, oil painting after a portrait by Sir Godfrey Kneller; in the National Portrait Gallery, London
John Wallis
English mathematician
William Oughtred, watercolour by George Perfect Harding after an engraving by Wenceslaus Hollar, 1644; in the National Portrait Gallery, London.
William Oughtred
English mathematician
Robert Recorde
Welsh mathematician
Clifford Geertz
American anthropologist