Relax as you learn about the long and curious history of coal (enjoy EVERY episode of Calm History by becoming a Silk+ Member – It’s FREE for a limited time!).* Silk+ Membership, FREE for a limited time, grants you access to 600+ episodes from these Premium Podcasts: * Calm History (70+ episodes) * Sleep Whispers (430+ episodes) * ASMR Sleep Station (50+ episodes) * 1 & 8-Hour Nature Sounds (50+ episodes) * 1 & 8-Hour Background Sounds (30 episodes) * Counselor Curt ASMR (20+ episodes) * ASMR University (10 episodes) ************************************* Become a Silk+ Member, FREE for a limited time [silkpodcasts.com/plus] FREE alerts of new episodes. Tap “Follow“ on [Apple or Spotify] Shape the future of Calm History [Vote Now] Rate & review Calm History on [Apple Podcasts] Website, Contact, & All My Podcasts [silkpodcasts.com] Bored?  Explore my Favorite Goodies! [silkpodcasts.com/faves]   *Content adapted, remixed, edited, and produced by Harris from materials in the public domain and from Wikipedia. Calm History is part of the Airwave Media podcast network: AirwaveMedia.com Contact [email protected] if you would like to advertise on this podcast.