I watch my three-year-old niece as she dances through rooms falling, tumbling, and running into almost everything. She hasn't figured out how her body takes up space yet, and she doesn't care. She moves through the world like it's hers. Only when a step that leaves her headfirst on the floor with a headache does she even show signs of discomfort. I want to be like her when I grow up. I want to take the world b[...]