Something that I have often wondered about, is why we still have people who live the most primitive lifestyle, barely about what some of the more intelligent primate species live. If all of mankind started out as primitive human beings, why is it that some peoples learned how to do things better, invented new tools, and improved their lifestyle, and other people/tribes simply continued on with their primitive existence. Maybe once, people found shelter (lived in caves), but then humans started creating their own shelters, such as primitive huts and even tents in some countries. Eventually, that led to the creation of permanent houses, and by then, we had also developed farming and growing most of our food as opposed to simply foraging for what we could find to eat each day. Now, we have a world where there are in existence a complete variety of lifestyles, from the modern day civilizations that we enjoy here in developed countries, to the more minimalist lifestyles of some of the third world countries, and then we have the very primitive people dwelling in the remote jungles of the world, as well as the Australian aborigines. Why do some civilizations improve themself, and others simply exist in a primitive life and never change anything ? Was there someone who came to this earth and taught some peoples to improve their lives ? Domesticated animals , for example , dogs, can be taught to do some amazing things when people take the time to teach them. Maybe , that is what happened to some of the human civilizations, too.