The telephone, the power plant, the refrigerated railroad car, the moving assembly line, and the car.
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The Yellow River's Contribution to the World
Gunpowder, the compass, paper making, and printing - all of these inventions not only promoted Chinese cultural development, but also spread to the rest of the world, making an important contribution to the development of humankind.
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It established a form of self-government based on a social contract
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Image result for What was the "Three Field System" and how did it revolutionize European agriculture?
The three-field system let farmers plant more crops and therefore increase production. ... Crop assignments were rotated every year, so each field segment would be planted for two out of every three years. Previously a "two field system" had been in place, with half the land being left fallow.
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The United States is planning to start a war with the Soviets.
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