Counting on Katherine: How Katherine Johnson Saved Apollo 13 by Helaine Becker is an inspiring children's book that tells the story of Katherine Johnson, a brilliant mathematician who played a crucial role in the success of the Apollo 13 mission. Written for children ages 4-8, this hardcover book is both educational and engaging, and features beautiful illustrations that bring the story to life. With a focus on perseverance, hard work, and the power of education, Counting on Katherine is a must-read for any young reader interested in science, space, or history.