Sci-fi films and TV shows have routinely depicted a brutal race of visiting Earth in their spaceships and enslaving unfortunate Earthlings. But according to one expert, extraterrestrial life may actually be too scared of 'dangerous' and 'violent' humans to want to come here. Dr Gordon Gallup, a biopsychologist at the University of Albany, argues that humans are 'dangerous, violent and ceaselessly engage in endless bloody conflicts and war'.
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