You know how crowded and overpopulated Japan is, but get this - On the subway in Japan there are men whose job is to push the people into the subway car. I never knew that. It's so fun learning right along with the kids. I realize this fact alone will not be on any achievement test, but it helps the kids understand how really crowded it is in Japan. They don't get that there are 127million people in a space a little smaller than California (with a population of 36million, I think). They do get that subway travelers are packed-in like sardines!