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One halcyon spring day in 1903, the 69-year-old anatomist and naturalist Dr. James Bell Pettigrew sat at the top of a sloping street on the outskirts of St. Andrews, Scotland, perched inside a petrol-powered airplane of his own design. Over the course of 40 years, ever since he began his aeronautical experiments in London in 1864, Pettigrew had constructed dozens of working models of various flying apparatus. From anatomi