This 2018 episode covers an even from June 30, 1908, when at approximately 7:15am, the sky over Siberia lit up with what was described by witnesses as a massive fireball, or the sky engulfed in fire. For the last century, scientists have been trying to figure out exactly what happened. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.