Many Americans are familiar with the astronaut heroes of the 20th century space race — names like Gus Grissom and Neil Armstrong. But who did the calculations that would successfully land these men on the moon?
CorrectionSept. 26, 2016
A previous version of this story had Margot Lee Shetterly’s name misspelled as Shetterley in the text and a photo caption.
Also, in the audio, as in a previous Web version, the actress Octavia Spencer is misidentified as Octavia Butler.