Henry is on the right track here. A variety of alien races have a presence on earth. Some of them have been here for millennia. I believe some of them are involved with the Illuminati.
Studying alien involvement with the human race does not discredit anything. Many may have a hard time believing it, but if it is true, then it is true. More people are learning about the alien presence as information about it has circulated widely.
I have not personally met any aliens, but I have seen a UFO. I was driving on the freeway in Phoenix, Arizona, one afternoon, and when I looked up, there it was. It was amazing. It appeared to be about the size of a large airplane, symetrically curved on top and bottom, and silver in color. I could see it for between 3 and 5 seconds, and then it disappeared.
Here is a good book about the long-term alien presence:
The Gods of Eden
Here is a good site about aliens and the Illuminati: