Admittedly there is scientific evidence that is irrefutable that U.F.O's (Unidentified Flying Objects) indeed exist, if they are Prototype aircraft that aren't publically acknowledged due to Patent's Pending. Otherwise they should really be termed U.A.P's. (Unidentified Ariel Phenomena) As many posters will post in this thread (... and have subsequently done so in previous threads on the subject): UFO was an old term, what a person see's while unidentified doesn't have to be flying or an object, it is just something they perceive as Ariel and is a Phenomena. UFO's != (is Not Equal to) Extraterrestrial Aliens. If anything you should use UFO's are <= (Less than Equal) Extraterrestrial Aliens, Which means the chances are so astronomically remote that its hardly worth the energy consumed by the neurons in your brain to even consider the remotest possibility of Aliens existing, let alone visiting this planet on Day-tripping excursions.