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Trust me on this, it is 100% Martin Luther. He was a german professor in Germany who wrote the Ninety-Five Theses'.
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The natives feared that Chinese workers would take their jobs.
Early civilizations depended greatly on agriculture, which means that they depended on water.
What Mesopotamians and Egyptians did (as well as others) was that they built canals from the rivers which would lead water to the crops as an irrigation system more or less.
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BioTeacher101
Gunpowder in Tang and moveable wooden type in Song.