Best known as the rabble-rousing journalist responsible for penning the shocking novel exposing unsafe practices in the meat industry, The Jungle, Upton Sinclair was an insatiably curious free-thinker who also focused a great deal of his writing on what would be called "self-help" today. In The Book of Life, he takes on a remarkable array of topics both benign and highly charged, ranging from moral philosophy to his views on diet, exercise and health.