UFO? 'E.T' or 'Alien'? Scientists debate nature of extraterrestrials

UFO? 'E.T' or 'Alien'? Scientists debate nature of extraterrestrials: "At one extreme in alien-invasion movies, there's the slimy, razor-toothed, grotesque creature full of powerhouse violence -- and a too-eager desire to feast on human filet. These aliens, never cordial in social settings, are the worst-nightmare kind of beast that one finds in the "Alien" series or "The Thing," among many others.



At the other extreme are kinder, gentler alien visitors -- "E.T.: The Extra-terrestrial," "Paul" and "Close Encounters of the Third Kind," along with those using human form to hide their extraterrestrial identities as happened in "Starman" and "Cocoon."