here is my theory,you know how we were once cave men?well how did we start building all this crazy stuff out of nowhere?i know some people will say "Because of evolution!"but what if something out there,in space,came down to earth and did something to our brains.To be honest i think we should thank the species that lives up there.Without them we would have nothing.By the way this is what i think might of happened,you don't have to believe or agree with me!:)