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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

Franklin D. Roosevelt, who formulated the Four Freedoms.

7 Alphabet Soup Agencies that Stuck Around

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

New Seven Wonders of the World

airplane in flight (plane, aircraft, flying)

7 Puzzling Plane Disappearances

Camel at Khor Rori, Oman; mammal.

Do Camels Store Water in Their Humps?

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

power

multiplication

Learn about this topic in these articles:

definition and notation

$A page from a first-grade workbook typical of “new math” might state: “Draw connecting lines from triangles in the first set to triangles in the second set. Are the two sets equivalent in number?”$
In arithmetic: Exponents
…a the base of the power a^k.
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