Frida Kahlo lived fewer than 50 years, but hers was an intensely examined life, and one that enthusiasts all over the world are still poring over. As a child in the suburbs of Mexico City, Kahlo, born in 1907, survived polio. As a teenager already enrolled in premedical studies, her body was brought forcefully to her attention again by a bus accident whose physical repercussions would shape the rest of her days, crucially inform her artwork and eventually kill her. Kahlo was already a painter when she married the political muralist Diego Rivera at 22, a volatile pairing that survived much unre...