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  • Cathedrals and Universities: Crash Course History of Science #11

  • Geometric Optics: Crash Course Physics #38

  • Life and Longevity: Crash Course History of Science #44

  • Life and Longevity: Crash Course History of Science #44

  • Roman Engineering: Crash Course History of Science #6

  • Roman Engineering: Crash Course History of Science #6

  • The Epic of Gilgamesh: Crash Course World Mythology #26

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