I saw a TV special on Roswell that said that the only reason anyone thought that there were aliens that landed there was because of the cover-up which led to rampant speculation and fantasizing. Some people claim that there was a saucer there but the U.S. was developing flying saucers around that time so it's probable that one of the experimental saucers crashed and the government didn't want to let this secret out because of the tension between the U.S. and the Soviet Union. I heard just this past week that there are reports that have just been released by one of the people who worked at the Roswell base at that time and he said that he saw small bodies being taken away that did not look like human bodies. He said they were smaller, very thing, and had bigger heads. I don't remember what the guy's name was but supposedly this is the biggest recent development concerning Roswell and many of the believers think that it constitutes absolute proof and puts any doubts to rest. I don't personally believe that aliens landed there, I think it could be a possibility though. Yes there are many things that the government knows that we know nothing about. For instance I saw a show where people who used to work with NASA and other space agencies said that NASA did a coverup on the moon and that there are actually "moon cities" with space craft traffic flying to and from the moon. There are videos of this online, I can't remember where to find them though. They showed photographs of the moon that were released to the public that were doctored and you could see clearly that they were edited.