Watch: Taraji P. Henson, Octavia Spencer and Janelle Monae are 'Hidden Figures' of the space race

Behind every great man, they say, is an even greater woman. In the case of John Glenn, the astronaut who became the first American to orbit Earth in 1962, there are three he, and NASA, have to thank: Katherine Johnson, Dorothy Vaughan and Mary Jackson, all African American women who worked for...

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