UFO: Are We in Danger ?: The Black Book of Ufology

Should we be afraid of UFOs? In June 2021, NASA's boss admitted that "I've talked to those pilots, and they know they saw something, and their radars locked onto it, and then all of a sudden it was here, on the surface and then it's there. And they don't know what it is, and we don't know what it is. We hope it's not an adversary here on Earth that has that kind of technology." The fear? That the "unexplained phenomena" are a sign of an advancement, terrestrial or extraterrestrial, which is...