Is this writing natural? If someone asks me "what is study?", I will answer "Refined curiosity.". It is because that people didn't want to be born in this world. Even this unkind world doesn't explain why we were born or why we have to live. Just one day, we was born and began to live. In above reasons, living was the reason of life for the first human beings. The first human beings with irrational anxiety about death were living in this world for living. Going through several generations, human beings would get used to this world and the peak of the adaptation would be an agricultural revolution. After that, human beings who don't have to live for living appeared. Some of those human beings asked themselves "why must we live?". These questions became bigger and reached the questions that "why does nature have these forms?" or "why do human societies have these forms?". So I think that these questions or the answers to these questions made Refined curiosity called study.