Humans have been spotting — and remarking on — mysterious forms in the sky since the beginning of recorded history, but author Garrett Graff traces the "modern age of UFOs" to a flurry of sightings that occurred around the U.S. following World War II — and to a particular incident that happened in Roswell, N.M.
In July 1947, Roswell rancher Mac Brazel found some strange materials on his property. He took the debris to a nearby military airbase, where the commander made a surprising declaration: Brazel's finding was evidence of a flying saucer.
