Learn all about the saddest phone notification in today's episode. See omnystudio.com/listener for privacy information.

You've probably been to a symphony performance and wondered, what in the heck are conductors doing up there anyway? Well we're here to explain that as best we can.See omnystudio.com/listener for privacy information.

Think tanks? More like stink tanks! We're kidding. Think tanks do valuable work, when they operate in a non-partisan way of course. Learn all about the history of these heady institutions in this classic episode.See omnystudio.com/listener for privacy information.

If you grew up in the 70s and 80s in America, you probably have the image of your tattered Guinness Book of Records. The book was ubiquitous then, but is still thriving today in despite the internet. See omnystudio.com/listener for privacy information.

Mudlarking is a uniquely British hobby, though you can dig through river mud anywhere there's a river. But the Thames has the good stuff. See omnystudio.com/listener for privacy information.

Unit 731 was a secret group within the Japanese Army in WWII that committed unspeakable atrocities against humans in the name of scientific research. Listen with caution. See omnystudio.com/listener for privacy information.