A picture book biography of Elizebeth Friedman, a brilliant American code breaker who smashed Nazi spy rings, took down gangsters, and created the CIA's first cryptology unit, includes explanations of codes and ciphers and secret messages for young readers to decode.

This is a children's book biography of Grace Hopper, who played a prominent role in the early days of computers.-- Reveals how a woman with a passion for math and science revolutionized computer coding, defying conventions and difficult challenges along the way.

"The queen of chess, Judit Polgár, dazzled the world as a prodigy, winning tournaments, gold medals, and defeating eleven world champions, including Garry Kasparov and Magnus Carlsen. At her peak, Judit was rated the eighth best chess player in the world. But before these tremendous successes, Judit burst onto the chess scene as a ferocious, child competitor. Beating adults by five-years-old, and winning international tournaments by age nine, Judit...