You know that our planet has had several era and age. I think if you start at the beginning of the world to be a man cave man. A man living in caves at the other cave people. He could start to build everything from wood. A man shaking the experience and time to learn to develop from the stone, then later of iron, and so on. by the time he learn something else, the neighborhood changed, animals, other people and himself. For example at the beginning of Machete man from a tree make a wooden club. The development of wood mace Carry on the rocky club. This is my idea of o o if you liked the little bit something type it in the comments. I have many other ideas if you need further izpalÄ«dzÄ Å¡u. KV!