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Sudoku puzzles

Will We Ever Run Out of Sudoku Puzzles?

Advertising poster for the opening in Paris of "Montagnes Russes" (Russian Mountains), c. 1882-1888, by an anonymous artist; in the collection of the Musee Carnavalet, Paris, France. (graphic arts, posters, roller coasters)

Where Was the First Roller Coaster Invented?

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Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

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

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

Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)

Falling Stars: 10 of the Most Famous Endangered Species

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

Happy, smiling, flying pig

7 Everyday English Idioms and Where They Come From

Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.

7 Deadliest Weapons in History

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