In reality, the Tulsa "race riots" of 1921 was more like a massacre. Yet it was almost lost to history until 1997, and still not widely known outside of Oklahoma until HBO's The Watchmen put it on the cultural map. Learn all about this dark chapter in American history in this classic episode.See omnystudio.com/listener for privacy information.

The Killdozer rampage is one of those stories you just couldn't make up. Yet it happened. And we're here to tell you the story. See omnystudio.com/listener for privacy information.

Who were the Ritchie Boys? Listen in to find out. See omnystudio.com/listener for privacy information.

Years ago the telephone network was like the internet is to us today: a vast, interconnected means of communicating and sharing information. And, like the internet today, it attracted people who were interested in learning how it worked by hacking it.  See omnystudio.com/listener for privacy information.

Caffeine is a heck of a drug - at the same time it's both good and bad for you. Learn the good, bad and ugly about this everyday stimulant in this classic episode.See omnystudio.com/listener for privacy information.

Human papilloma virus, HPV, is an unusually common bug among humans. Most of the time it’s benign and your body manages to overcome the infection. Sometimes it can linger and cause warts.  But in the worst cases, HPV infections can actually cause cancer.See omnystudio.com/listener for privacy information.