A conspiracy theorist believes extraterrestrials that look just like humans are here on Earth and you may not even know you are speaking to one. Marcus Allen is the publisher in the UK of alternative news magazine Nexus, which provides monthly updates for so-called 'truthers' on conspiracy theories and other alternative philosophies. Mr Allen made the staggering claim to a packed audience of the 27th Glastonbury Symposium, an annual event dedicated to all things paranormal and new age. He claimed that there was a difference between aliens and extra terrestrials, and that both of them were already on earth, but their existence has been covered up by world leaders. He said: "Aliens do not look like us, but ETs (extraterrestrials) do look like us. "There could be some here in now and you wouldn't know." He then extended the theory to suggest that all humans could in fact be aliens who came to earth from another planet before our primitive ancestors. Mr Allen said: "In a way we are the