
To date, the firm conclusions of Project Blue Book are:
   1. no unidentified flying object reported, investigated and evaluated
      by the Air Force has ever given any indication of threat to our
      national security;
   2. there has been no evidence submitted to or discovered by the Air
      Force that sightings categorized as UNIDENTIFIED represent
      technological developments or principles beyond the range of
      present-day scientific knowledge; and
   3. there has been no evidence indicating that sightings categorized
      as UNIDENTIFIED are extraterrestrial vehicles.
- the summary of Project Blue Book, an Air Force study of UFOs from 1950
  to 1965, as quoted by James Randi in Flim-Flam!
