A review of David Halperin's Journal of a UFO Investigator (Viking, 2011) By David Metcalfe Riddles chased mysteries, were chased by enigmas, around and around my brain. --from Journal of a UFO Investigator On June 24, 1947 the U.S. Air Force pilot Kenneth Arnold witnessed a series of angular, wedge shaped objects skipping like saucers across the sky near...