In this replay episode: On a beautiful summer morning in 1908, a massive explosion hit Siberia. It downed 80 million trees and lit the night sky 3,000 miles away in Sweden. But to this day, no one knows what caused it.

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In this replay episode: In the race to become the reigning superpower, nations have resorted to all sorts of bizarre tactics. Some of them were pretty humorous. And that reached new heights during the Cold War.

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On this replay episode of The Backstory: Born into complete poverty and now, by some accounts, the richest man in the world, Vladimir Putin has also become an enemy of most of the world. Here's where he came from, how he got a stranglehold on power, and what he’s doing with it.

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It’s never been easy to be a teacher, and yet their value is immeasurable. But imagine a time when teachers couldn’t date, dye their hair, go to a barber shop, or even enjoy a trip to an ice cream shop.

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Did you know there was a period of time when the U.S. government secretly used the public to test biological weapons? Some sites included rural Georgia, San Francisco Bay, and the New York City subway system.

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There have been plenty of killers who admitted they were inspired by violent movies, TV shows, and video games. This is the story of a couple of teenagers from the Midwest who robbed and murdered folks just to recreate their favorite movie: Natural Born Killers. And there's a powerful celebrity connection in this saga.

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We all know major public figures who drive us crazy because they loudly share opinions we don’t agree with. But that’s democracy, right? So, the iconic Greek philosopher Socrates was exactly that kind of big mouth 2,400 years ago in Athens, where democracy was just being originated. Problem is, he angered the wrong big shots and wound up being executed in a really unusual way.

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Partying is supposed to be all about providing entertainment for family, friends, or people you want to impress. But frequently, it’s about entertaining yourself. Some of history's wildest parties involved setting guests on fire, making them eat until they vomited, or making them have sex with strangers.

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