well, imo, man was formed somehow... many ideas have been put forth on this and unless we travel back in time, we cant know... so, i imagine there was an original cave we all stayed in... just like now, there were relationship issues.... struggling to get along with each other from the beginning... and ... we still are... when we look at the destructive capabilities of our own weapons it makes me wish they had found the way to get along way back then, but, there was enough space in those days so i spose the one group just moved out and started thier own cave family.... here we are now.. still trying to get along together and cave space is somewhat less available... still, i know we can do it