John E. Mack, prestigious psychiatrist of Harvard, after some colleagues commented testimonies to him of diverse cases of extraterrestrial abductions, initiated a meticulous study of different cases picked up in different parts from the world. They were too many chances narrated by separated people in thousands of kilometers that never had been seen. The idea of conspiracy on the part of the government acquired force, something that did not like too much The advances of the Dr. Mack, were truncated radically because of a strange death, a suspicious upsetting in London. Visitors, are a fiction history, but that perhaps is not much of the reality

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