CLASSIC: What exactly are "Ghost Lights"?

For centuries people in countries across the planet have reported seeing mysterious, glowing lights that appear to move of their own volition through the darkness. Whether you call them Ghost Lights, Spook Lights, Will o' the Wisps or any other number of names, chances are there's a local version of this legend somewhere in your region. So what exactly are these things? They don't want you to read our book.: https://static.macmillan.com/static/fib/stuff-you-should-read/ See omnystudio.com/listener for privacy information.