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a Next we have an Assyrian crystal lens from the seventh century BC To grind such a lens requires a highly sophisticated mathematical formula Where did the Assyrians get such knowledge'? Finally, these very ancient fragments, now in the Baghdad Museum, have been identified as the remains of an electric battery. The next five photographs are from South America, a continent teeming with ruins and unexplained puzzles: This is part of a huge monolithic block weighing an estimated 20,000 tons It can be found at Sacsayhuaman in Peru What was its purpose? What titanic forces turned it upside down? nao arr a rn)