The Mayan Empire once flourished in the dense rainforests of what are now southern Mexico and Central America. Over centuries, the Mayans acquired the elements of an advanced civilization, including large cities, an organized priesthood, a system of writing, and mastery of science and technology. The Mayans understood architecture enough to build pyramids and palaces and math and astronomy enough to create an accurate 365-day calendar. Listen to learn more facts about the magnificent Mayans and some theories about why the Golden Age of the Mayans came to an end.
Story Length: 4:03
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Understanding and tracking time is key to keeping society -- and our lives -- running smoothly. Early civilizations developed calendars with just 300 days in a year. But by 1582, the time it takes for Earth to rotate around the sun was better understood, and Pope Gregory introduced the 365-day Gregorian calendar -- the one used by most of the world today. Listen to hear a scientist explain the math behind adding and subtracting leap days to keep the calendar aligned with the Earth’s movement, and learn how Christianity played a role in the calendar’s creation.
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Democracy is a form of government in which citizens have input into the rules that govern them. In the United States, people elect representatives at the local, state, and national levels, and those elected representatives make laws. Listen to learn about how democracy works in the United States and how voting rights have changed since the nation began.
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Early humans traded goods to get what they needed, but bartering was not practical when one person did not want or need what the other had to offer. Eventually money was invented to make economic exchanges easier and more practical. Listen to hear how our money system evolved, what early currencies looked like, and why people must agree on the worth of currency for it to have value.
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