This book brings to life the story of four African American female mathematicians working for NASA at the height of the Space Race between the United States and Russia—Katherine Johnson, Mary Jackson, Dorothy Vaughan, and Christine Darden. All talented mathematicians, they had to work under conditions of racism and sexism, but still distinguished themselves through their work and significant contributions to the agency. Even in this young readers’ edition, there are plenty of details and research, along with a helpful timeline and glossary.