What muslim knowledge and technology was brought back to Europe as a result of the crusades

1)I think that Richard the Lionheart won the third crusade.

2)False, lasted for 200 years

3)The Christans did control Jerusalem.I think that the knowledge did increase because new medicines were passed between Arabs that helped the Christians. I believe that the Crusaders first learned about the numbers 0-9 because of the Arabs and spread them to Europe so I think that all 3 are correct? I'm not sure.

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