At around age two, we begin to get a sense of our "self"; of the idea that we are unique in the world. It is a time of wonder, curiosity and infinite possibility. Children ask on average well over 100 questions a day, as those of us who are parents and grandparents understand at a deep and excruciating level. (my own personal favourite? "Grandpa, when you turn the light off, where does the light go?")