Have been Visited by Aliens?

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I always wonder if we have been visited by extra terrestrial visitors. After analyzing information on this subject, my conclusion has been "Yes". If they are here, then why are they in hiding!!! This is what intrigues me. Why are they abducting humans? Are they cross breeding or merely conducting experiments. Do our Governments know about these visitors. What do they benefit by hiding this information!!! This discussion will try to throw light on these intrigues and I invite people to freely express their opinion.