ABSTRACT
Consider newborn children. They have to learn to understand the whole world: the space we inhabit; the distance between objects; what people are and who they can trust; how to feed; how to move; how to understand talk, and then to talk; how to move their bodies, to crawl, to walk; to love and be loved. They do all this by sharing our world, our food and our lives. They accomplish all this in two years.
