hardware

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airplane in flight (plane, aircraft, flying)

7 Puzzling Plane Disappearances

Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

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

6 Lost Civilizations

World map. Continents. Oceans. Mendel thumb ok

Just How Many Oceans Are There?

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

Statue of Liberty in front of the skyline of Manhattan, New York City, New York.

Who Was the Woman Behind the Statue of Liberty?

Camel at Khor Rori, Oman; mammal.

Do Camels Store Water in Their Humps?

hardware

building

Learn about this topic in these articles:

locks

In lock
…be opened except by a key or by a series of manipulations that can be carried out only by a person knowing the secret or code.
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