Before John Glenn orbited the earth or Neil Armstrong walked on the moon, a group of dedicated female mathematicians known as human computers used pencils, slide rules, and adding machines to calculate the numbers that would launch rockets, and astronauts, into space. Now in a special new edition perfect for young readers, this is the amazing true story of four African American female mathematicians at NASA who helped achieve some of the greatest moments in our space program. Soon to be a major motion picture.