Mysterious lights hover over a small town in Texas. Civilians' stories of UFOs conflict with the Air Force's claims of F-16s dropping flares. A fishing boat vanishes without a trace in California, only to be found entirely undamaged at the bottom of the ocean months later. "The Bloop" is the loudest sound heard in history, that is certain. But what caused it is the mystery. A scientist notices that cows always face either north or south, can they really sense the Earth's magnetic poles?