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Q&A The Rollercoasters of Ancient Egypt

Suppose that Khufu, pharaoh of Egypt and builder of the Great Pyramid of Giza, was introduced to the idea of an amusement park. More specifically, suppose that he was visited by a time traveler a...

7 answers  ·  posted 9y ago by Steve‭  ·  last activity 7y ago by Steve‭

Question physics alternate-history megastructures history ancient-history gas