We have 5 minutes after finishing today's material. So we talked about teacher's father's job. He is riding on the ship, and came back home rarely. 9 years ago when she got married, there are no internet on the middle of the sea. There is only telecommunication and could sent only short and expensive text messages. But now, they can communicate with video chat even in the middle of the sea. I think this is a big progress, and noticed internet infrastructure could make people happier.