How did the Muslims acquire the scientific knowledge that they passed on to the Europeans during the Crusades?

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The Muslims acquired their scientific knowledge from the Greeks, who conquered the Middle East (around 331 to 329 B.C.E.) under Alexander the Great and the Macedonians. During the Crusades, the Muslims passed their advanced scientific knowledge on to the Europeans, to whom much of Ancient Greece's knowledge had been lost. Subsequently, the Europeans of the Middle Ages advanced their understanding of chemistry, physics, astronomy, mathematics, and geography, as well as architecture, paper-making, textiles, and leather work.

How Did the Muslims Acquire the Scientific Knowledge That They