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How the Mayan Calendar Works
people.howstuffworks.com/mayan-calendar.htm
The Mayan calendar was one of the first attempts by people to keep some sort of historical record. Learn more about how the Mayan calendar works.
How Immigration Works
people.howstuffworks.com/immigration.htm
Immigration is one of the most controversial subjects in America today. Learn how immigration works and about visas, green cards and amnesty.
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