On Halloween 1938 young radio star Orson Welles scared the pants off of America with a fictional news bulletin claiming Martians had landed and were destroying the country. People across the nation ran wild with panic in the streets – or did they? Listen to this classic episode to find out. See...

The idea that we aren’t the first advanced civilization to live on Earth sounds like a fringe theory, but it raises a good question: How can we be so sure that a civilization didn’t arise and die on Earth so long ago that any trace of it has been erased? See omnystudio.com/listener for privacy...