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Katherine Johnson, a mathematician who was one of NASA's human "computers" and an unsung hero of the space agency's early days, died Monday. She calculated the flight path for America's first crewed space mission and moon landing, and she was among the women profiled in the book and movie Hidden Figures. She was 101.

Her death was announced by NASA Administrator Jim Bridenstine.

"The NASA family will never forget Katherine Johnson's courage and the milestones we could not have reached without her," Bridenstine wrote on Twitter. "Her story and her grace continue to inspire the world."