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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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Young boys working in a thread spinning mill in Macon, Georgia, 1909. Boys are so small they have to climb onto the spinning frame to reach and fix broken threads and put back empty bobbins. Child labor. Industrial revolution

The Rise of the Machines: Pros and Cons of the Industrial Revolution

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

Horses. Equus caballus. Horse stable. A brown horse looks out from his stall through the window.

Horsing Around: 7 of the Weirdest Racehorse Names in History

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

In this aerial photo, structures are damaged and destroyed October 15, 2005 in Balakot, Pakistan. It is estimated that 90% of the city of Balakot was leveled by the earthquake. The death toll in the 7.6 magnitude earthquake that struck northern Pakistan on October 8, 2005 is believed to be 38,000 with at least 1,300 more dead in Indian Kashmir. SEE CONTENT NOTES.

6 of the World’s Deadliest Natural Disasters

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.

The 6 Deadliest Earthquakes Since 1950

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sudoku smudged faces problem brakeman-fireman-engineer puzzle unexpected hanging paradox puzzle number game crossword puzzle Tower of Hanoi magic square Soma Cube