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Muslim armies reached Mesopotamia in the 600s, discovering mathematicians using "Arabic Numerals".
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This book was written on the discoveries he made by traveling to China,
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When this material was ignited, an expolsion occured and the rock and iron were thrust toward the enemy.
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Marco Polo discovered garmnets made of silk in China.
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The Chinese were very advanced with fighting technology.
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The Romans created leap year.
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The Chinese discovered how to use black explosive powder. The Chinese used it during battle to launch flaming arrows at enenmies.