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Gr 4-6 Twelve-year-old AP and his older sister, Kate, discover a miniature time-traveling device in the form of an abacus. They travel to Arthurian England, the American West (in time for the battle of the Little Big Horn), and to ancient Egypt. AP uses his amazingly broad knowledge of science and history to get them out of various predicaments. Meanwhile, they are stalked by a bumbling nemesis, Snakebite, who seeks the abacus, even though he can time trave...Log In or Sign Up to Read More