Mary Cassatt was a headstrong, determined girl. She wanted to be an artist in 1860, a time when proper girls certainly weren't artists. It wasn't polite. But Mary herself wasn't polite. She pursued art with a passion, moving to Paris to study, painting what she saw. Her work was rejected by the Salon judges time and time again. One day, the great painter Edgar Degas invited her to join him and his group of independent artists, those who flouted...