A very good description of the theories and investigations that focus on the nurturing of infants as a central aspect of human evolution. A mother simply cannot bring up a child all on her own, she needs a lot of assistance and collaboration from other mothers, fathers, relatives, older children, grandmothers and so on. How did this dependency come about? What does it entail, and what are the consequences? This book summarizes the research in this field up to 2008. It should be required reading for anyone interested in how humanity works.