The Federal Bureau of Investigation has broken its silence on the most popular file in its digital vault. The one-page memo, dated March 22, 1950, was addressed to FBI Director J. Edgar Hoover from Guy Hottel, then head of the FBI's Washington, D.C., field office. It relayed some information from an informant. The subject: FLYING SAUCERS INFORMATION CONCERNING "An investigator for the Air Force stated that three so-called flying saucers had been recovered in New Mexico," Hottel writes. "They were described as being circular in shape with raised centers, approximately 50 feet in diameter. Each one was occupied by three...