HOMEWORK: Which is better, having new things or keeping old things? I think that new thing is better than old thing. But, we must search which is the good thing in this situation. If the situation requires old things, We choose old one. For example, korean heating system, korean traditional house, and other useful skills. However, the situation requires new one, We must change method. We can't use old printing system, nevertheless there is better printing system. In the book which i read, somebody says that "People society are flood. that is unexpected, riding skill become old thing soon. If not you make new riding skills, you are eaten the flood. And these are made for the old. The world change very fast. We must remind yesterday, accept good thing, and upgrade life quality.