I did a cleaning up for my home.I have packed up ten boxes unwanted things. There are all sorts of things , such as books, old clothes and lecture notes. Moreover, a lot of things I bought but only used a few times. At the time, I bought them. I thought them so useful. For example, I bought a water filler system. That is so good. I can drink a cleaner water. But I found the fillers costed so much. Then I back to the old way, drinking a nomal water. When I bought a new things, I only think the most ideal case. After I started to use those things, I know the real situation is not so good.