On December 17, 1903, Orville and Wilbur Wright flew the world's first airplane at Kitty Hawk, North Carolina, establishing the Wright Brothers as world-renowned pioneers of flight. Known to far fewer people was their whip-smart and well-educated sister Katharine, a suffragette and early feminist. After Wilbur passed away, Katharine lived with and took care of her increasingly reclusive brother Orville, who often turned to his more confident and supportive...