Equal in urgency and compassion to Half the Sky, this galvanizing new book from the acclaimed husband-and-wife team is even more ambitious in scale: nothing less than a deep examination of people who are making the world a better place, and the myriad ways we can support them, whether with a donation of five dollars or five million, an inkling to help or a useful skill to deploy. With scrupulous research and on-the-ground reporting, the authors assay the art and science of giving - determining the current most successful local and global aid initiatives (on issues from education to inner-city violence to disease prevention), evaluating the efficiency and impact of specific approaches and charities, as well as fund-raising.