You ever pay attention to the storyline of the alien and predator movies? basically what it says is that the predators created humans to worship them and on ocation to have a good hunt. Thats how i see it right now. I believe that if there really are aliens out there, there have got to be different species. We are a science experiment, lab rats if you will. The only way we are going to be able to prove that aliens exist is either to catch them unaware, which i find highly unlikely because if they can fly around abducting people i'm pretty sure they know of our efforts to try and locate them. The other alternative is that we must prove to them that we are not just lab rats, that we could one day be equal to them. cause i'm pretty sure they know how to fool our radio signals into thinking that there is nothing there.