But first, let's see what's in the secret compartment today. Oh, an iPhone. Stan, this doesn't factor into Chinese history until much later. An open letter to the Xia Dynasty. Dear Xia Dynasty, why you gotta be so fictional? You contain all of the most awesome emperors, including my favorite emperor of all time, Yu the Engineer. There are so many the greats and the terribles among royalty, and so few the engineers.