In 1943, Duchess Harris' grandmother began working at NASA. She was one of 11 black women mathematicians hired when there were no more qualified white men — many were off to war — nor white women available to work on beating the Soviet Union in the space race.
Few knew they were there. But astronaut John Glenn did. He sought them out to verify others' calculations. They were that good.
Their story is told in the movie "Hidden Figures," starring Janelle Monae, Taraji P. Henson and Octavia Spencer. It opens Friday.
Harris, a professor and chair of American studies at Macalester College in St. Paul, has written a book about how those black women resisted racism and sexism to support their families and, she said, "to advance a country where they were not full citizens." That book, which is aimed at middle-school students, is called "Hidden Human Computers: The Black Women of NASA."
Harris' grandmother, Miriam Daniel Mann, died two years before Harris was born, but Harris grew up with the stories. We talked with her about these "human computers" and how their work only now is coming to light.
Q: Describe the work done by your grandmother and the 10 other women.
A: They worked with slide rules doing the calculations to measure the distance and arc for the astronauts' return. The most fascinating issue was not getting them there; it was their return to Earth [such as hitting the right re-entry trajectory]. Were they going to be able to come back safely?
Q: They had human computers double-check the work of the electronic computers?