Yael Friedman, a 53-year-old single mother, lives in the Israeli village of Arad with her 10 children. But she's not a typical single mother by any measure. For one thing, she gave birth to none of those children. Friedman works as a professional mother in a community that matches neglected and abused children -- 10 at a time -- with a women who is willing to assume the role of mother. This mother-by-choice also has to agree to stay single, to avoid any entanglement that would distract or detract from her task.