What are greys?

(Skepticism Again)

I want to believe that aliens are really real, but until something happens first-hand to me I will remain skeptical. I want to believe that in government conspiracies, but the simplest solution is most likely the correct one and so there probably isn't(Ones concerning Aliens anyway). I believe that complex, huge crop circles are not all made by a few old hoaxers at night in the pitch black. And when is are the Aliens supposed to come? Dec 12, 2012 or is that just an astrological date?