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Close up of periodic table, focus on nickel, copper, zinc, palladium, silver, cadmium

When Was the Periodic Table Invented?

Bar graph of the United States Death Toll during major events. Infogram chart.

U.S. Death Toll During Major Events

Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

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

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

World map. Continents. Oceans. Mendel thumb ok

Just How Many Oceans Are There?

Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile

6 Lost Civilizations

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