Infants explore their world continually during their waking hours: pushing, pulling, poking, and prodding. Why do some events capture their interests and cause them to make that event occur again and again? Watch this clip of an infant pushing and pulling and scraping objects attached to a wall. These objects move and also make sounds. To describe what is happening, we can say more than, “the child is learning about cause and effect.” That phrase explains nothing, because it is too general, like saying, “The child is learning about life.” We can speculate on the relations among the infant’s body, the shape/location of the object, the ease and reliability of making a particular effect happen again, and so forth. These speculations move us closer to understanding how children think. Choices are made for reasons, and these reasons define infant intelligence.