UFOs
From the Series Investigating the Unexplained
Most sightings of unidentified flying objects can be explained--but not all of them. Those that cannot be are the focus of investigation by UFO researchers. They use video cameras, binoculars, radar, and other technology together with eyewitness accounts to try and identify strange objects in the sky. Students who read this title will find themselves later wondering: what is that strange object in the sky?
