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British troops in a trench on the Western front during World War I. One officer takes reports of the fighting over a field telephone while the officer on the left jots it down and issues new orders.

Life in the Trenches: A World War I Photo Gallery

German machine gunners occupy a trench during World War I.

Weapons of World War I

Discover

Human Cannibalism; Johannes Lerii's account of the description of the method the Indians use for "barbecuing" human flesh. Nude Indians barbecuing and eating parts of human bodies; Theodor de Bry.

Cannibalism: Cultures, Cures, Cuisine, and Calories

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

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?

Close up of praying mantis walking on stone ground against a blurred background in Japan

6 Animals That Eat Their Mates

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

Cruel and Unusual Punishments: 15 Types of Torture

Computer mapping, woman at early 1990s computer

Timeline of the 1990s

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

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Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Facts

Also Known As	dichloro(2-chlorovinyl)arsine

Topics

arsine

Key People

Julius Arthur Nieuwland

American chemist