Explores the true story of four African American female mathematicians recruited by the U.S. government during World War II to work at the Langley Memorial Aeronautical Laboratory. Their job involved being "human computers," using pencils, slide rulers, and adding machines to calculate the numbers that would allow rockets and astronauts to be launched out of the atmosphere. http://www.mackinvia.com/5646224 .

LEXILE 1120 NONFIC. https://www.teachingbooks.net/ql7g8om .