The Princess of Wales visits Harvard University to talk to experts about the early years development of children. As Kate leaves, she goes on a walkabout to greet huge crowds of well-wishers, stopping to pose for selfies, have little chats about the weather, Wales and Princess Charlotte and to receive bouquets of flowers. Report by Patelr. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn