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is, perhaps, the oldest written story on Earth. It comes to us from Ancient Sumeria, and was originally written on 12 clay tablets in cunieform script. It is about the adventures of the historical King of Uruk (somewhere between 2750 and 2500 BCE).
This site provides a free physics textbook that tells the story of how it became possible, after 2500 years of exploration, to answer such questions. The book is written for the curious: it is entertaining, surprising and challenging on every page.