Tunguska: When the Sky Exploded

In 1908, something tore through the skies over Siberia and exploded with the force of a thousand Hiroshima bombs. Trees were flattened across 800 square miles, yet no impact crater was ever found. What caused the Tunguska Event? A meteor? A comet? Something stranger?
In this episode, we analyze the science and the some of the wild theories behind the largest cosmic explosion in recorded history, and explore other mysterious blasts from history.