"A detail-rich picture book." --Kirkus Reviews
"Straightforward and inviting." --School Library Journal From award-winning author Lesa Cline-Ransome and acclaimed illustrator Ra l Col n comes the sensitive, informative, and inspiring...
Before John Glenn orbited the Earth or astronauts walked on the moon, a group of dedicated female mathematicians known as "human computers" used their knowledge, pencils, adding machines, and writing paper to calculate the orbital mechanics needed to launch spacecraft. Katherine...