PBS newshour. New book details U.S. government's UFO investigations and search for alien life /

Since the 1940s, unidentified flying objects have been a part of our nation's cultural phenomena. But for the U.S. government, UFOs have been a mystery and something the military has been investigating for decades. Amna Nawaz discussed that with Garrett Graff, author of the new book, "UFO:...

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