Did Halley’s Comet Convert the Irish to Christianity?

Many attribute the spread of Christianity in Ireland to St. Patrick. But medieval history and scientific evidence dating back to 540 A.D. hint at a more cosmic reason. (3:38)

Latest Videos

Preview thumbnail for video'This ex-trapeze artist made parachutes safer
This ex-trapeze artist made parachutes safer (3:02)
Preview thumbnail for video'A routine landing turns into every pilot's nightmare
A routine landing turns into every pilot's nightmare (2:34)
Preview thumbnail for video'Experts assess why this plane fell off a cliff
Experts assess why this plane fell off a cliff (2:24)
Preview thumbnail for video'Were lithium batteries the cause of this plane crash?
Were lithium batteries the cause of this plane crash? (3:11)
Preview thumbnail for video'Survivor shares terrifying moments before plane crash
Survivor shares terrifying moments before plane crash (3:15)
Preview thumbnail for video'How to tell if you're in for a bumpy plane landing
How to tell if you're in for a bumpy plane landing (4:00)
Preview thumbnail for video'1996 Brazilian flight crashes seconds after takeoff
1996 Brazilian flight crashes seconds after takeoff (3:24)
Preview thumbnail for video'This pressure suit helped pilots survive new heights
This pressure suit helped pilots survive new heights (3:59)
Preview thumbnail for video'What forensics tell us about this odd plane crash
What forensics tell us about this odd plane crash (3:25)