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Secret Service Agent Listens To Earpiece

Secret Service Code Names of 11 U.S. Presidents

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

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

Chapter 4 pg 42 - Chapter header of The Adventures of Tom Sawyer by Mark Twain. Published in 1884 by The American Publishing Company

Periods of American Literature

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

Attack on Pearl Harbor. December 7, 1941. Pearl Harbor infographic. World War II. Hawaii. United States. Japan. SPOTLIGHT VERSION

Attack on Pearl Harbor Timeline

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temporal summation spatial summation Bunsen-Roscoe law Ricco’s law neuromuscular junction action potential end-plate potential