An episode about deadly rocks! Really, it's about some minerals which may contain harmful elements that through the repeated, ongoing, and/or prolonged exposure to them in unregulated environments may cause damage over time... but that doesn't fit in the title.
If you want to learn more about some of these elements and their potential risk to your health, check out the Agency for Toxic Substances and Disease Registry -- tons of good info!
Huge thanks to Jim Holstein for all of his help making this video, and for being a total ROCK star!.... get it? 'cuz geology ... ok