Golden Age

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Across
  1. 4. who ruled from 813 to 833 founded the house of wisdom in Baghdad
  2. 6. captured some Chinese artisans skilled in paper making
Down
  1. 1. age when mathematics was invented
  2. 2. developed an early scientific method in his Book of Optics
  3. 3. left his name to the history of mathematics in the form of Algorism
  4. 5. astronomers mapped the solar system