Soap is a miraculous substance – and mysterious too: we have no idea how humans first figured out to make it. We lived with soap for millennia before we thought to use it to wash ourselves with it, but once we did a love affair with cleanliness was born.

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If you've ever wanted to know about champagne, satanism, the Stonewall Uprising, chaos theory, LSD, El Nino, true crime and Rosa Parks, then look no further. Josh and Chuck have you covered.

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Today we go down the road a bit, thumbs out, to explore the rich history of hitchhiking.  See omnystudio.com/listener for privacy information.

Hitchhiking: Two thumbs out!

Few people have been more qualified to survive a plane crash alone in the Amazon for almost two weeks than Juliane Koepcke. Let’s hear her story. See omnystudio.com/listener for privacy information.

Short Stuff: The Amazing Tale of Juliane Koepcke

Arson investigation has changed a lot over the years. There is actual science available now, but the word still hasn't totally gotten out. Listen in today, and don't play with matches! See omnystudio.com/listener for privacy information.

The Dubious Science of Arson Investigation

It's common knowledge that famines are usually caused by major droughts: Rain doesn't fall, crops don't grow, and people go hungry. But recent research suggests that while weather may trigger famines, they may actually be more of a human-made catastrophe. Find out more in this classic episode. See omnystudio.com/listener for privacy information.

Selects: How Famines Work

We think of estrogen and testosterone as the female and male sex hormones and they may seem kind of gross (is that just Josh?), but that simple understanding is way off. A magical biochemical dance between the two creates everything from bones to moods. See omnystudio.com/listener for privacy information.

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