World UFO Day is being celebrated amid a surge in sightings and government studies on unidentified flying objects. Its July 2 date has its roots in the so-called Roswell Incident on July 2, 1947, when something crashed at what was then the J.B. Foster ranch in New Mexico. The U.S. Army announced it had recovered a “flying disc.” But it later said the debris was from a weather balloon. The U.S. has held congressional hearings on UFOs over the past couple of years. But both the Pentagon and NASA have released reports saying they haven’t found evidence of alien life.