If you want to understand the concept of entropy, you should get A++ at statistical mechanics in graduate course. Oh my God. It may not be sufficient. There are many fools who can get A++ but cannot think the meaning of entropy. You must scrutinize(?) on the concept of entropy. And you can debate with your instructor of statistical mechanics. PS: When can I write Korean? My English is too poor. To KennyG, please read 'The Blind Watchmaker'. I said this word two or three times before. Ignorance is not a proud!