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pyramids
The ancient Mayan built pyramids.
The oldest of the three pyramids, the pyramid of Khufu, was built around 2580 BCE. The other two, the pyramids of Khafre and Menkaure, followed soon after.
The invention of the plow as lead to industrialization of farming practices. The plow allowed for larger areas of farm land to be plowed, which is quicker and more convenient then doing it by hand.
Scientist today still are puzzled on how the construction of pyramids became because they were so huge.