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slash and burn
created the calendar
The Mayan created the slash and burn method. It is where they cut down there crops and burned the rest. This is a reason why they think Mayan's died because the soil did not have nutrients to grow crops.
The Mayan's created the number zero. This is still used today in modern society.
The Mayan's created a Calendar round, it was based on two overlapping annual cycle's a 260-day sacred year. They also created a 365 day Calender that was so advanced that we still have one like it today.
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