The Periodic Table of the Elements (Encore)

The Periodic Table of the Elements (Encore)

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The History of the Pentagon

Before the United States entered the Second World War, it had a problem. The military was spread out all over Washington, D.C., and had difficulty functioning. The solution was a new massive building. Built in just 16 months during the urgency of World War II, the Pentagon began ...  Show more

The Rise and Fall of the Aztec Empire

Following the collapse of the Toltec Civilization, the Aztecs rose to prominence in 14th-century Mexico. The Aztecs constructed the most formidable state in the Americas, guided by a supreme emperor and a spiritual worldview that viewed human sacrifice as essential for cosmic sta ...  Show more

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