If you've ever asked a young child how their day was, you might have got a couple of responses - either a blank stare, or a list of every single thing that had happened to them that day. Judith Hudson studies memory development in children and the development of children's understanding of time. Professor of Psychology at Rutgers University in New Jersey, she says the way parents interact and talk to their children helps develop the child's memory for the past, and their ability to think about and plan for future events.