Comments by "D W" (@DW-op7ly) on "How did the Mongols Destroy Baghdad in 1258 ?" video.

  1. There is a ongoing 7 volume & 27 book series on what the Chinese invented. Called Science and Civilization in China. Which I bet the vast majority of people, don't even know about. And for sure have never read any of the books. The first book being published in the 1950s
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