CIA says at least HALF of all UFO sightings in the 1950's and 60's were spy planes, NOT aliens
'#1 most read on our #Bestof2014 list: Reports of unusual activity in the skies in the '50s? It was us,' the government agency tweeted yesterdayThe CIA explained that the UFO sightings were actually linked to them testing U-2 spy planes at altitudes
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