hardware

Directory

References

Discover

World Data Locator Map: Australia

Is Australia an Island?

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

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

Who Was the Woman Behind the Statue of Liberty?

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

U.S. Death Toll During Major Events

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

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

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.
Read More