Stuff You Should Know

Back in the 1920s, skywriting was invented to communicate with troops, but it quickly found its footing as a popular way for companies to advertise. Learn all about the aerial acrobatics and mental skill it takes to write mile-high letters backwards. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Karate, meaning "open" and "hand", was developed in Okinawa before being exported to Japan and then the rest of the world. It is one of the most widely practiced martial arts and one of the most difficult to master. Learn about it in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Almost three percent of Americans suffer from a debilitating disorder that causes them to suffer intense fear seemingly without reason and science hasn't yet figured out what causes it. Join Josh and Chuck as they get to the bottom of panic attacks. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Rogue waves come out of nowhere and tower as much as 100 feet over hapless ships they encounter, breaking across the boat and frequently breaking the boat and its inhabitants. Investigate the mystery of rouge waves in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

It's strange to hear, but the transition from hunting-gathering to agriculture, including the domestication of wild animals, is the single biggest thing to ever happen to humanity. You can thank it for everything from kingdoms to Ebola. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Every year, police across the U.S. get thousands of criminals to confess to their crimes. The trouble is, the procedure that almost all departments use is grounded in bad science and can produce false confessions. Learn about ways of making you talk. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Even if you entirely eschew the concept of money, we'll bet you'd be hard pressed not to trade in some form of currency. Learn how everything from cows to cacao beans to tiny shells from Maldives have served as currency at some time or another. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In America it's virtually a dirty word, but after being dragged through the mud for a century, socialism is still a part of the U.S.'s national character. Learn about this foil and complement to capitalism and why it might not be so bad. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Since scientists realized there is a type of cell that can grow into any other type, they have worked to use them to heal human conditions like Parkinson's and immune disorders. But because stem cells often come from embryos they remain controversial. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Ever wonder why some great shows go off the air after a season or less? Blame it on the Nielsen company, which has for more than 60 years been the almost exclusive decider of what goes and what stays on TV. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.