Stuff You Should Know

Houdini suggested that sword swallowing was merely a trick. But there's no sleight of hand or throat to this ancient practice. Practitioners really do swallow swords, car axles and more. Learn more about sword swallowers in this gag-reflexive episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

After 800 years of creating coats and crests, some meaning has been lost to history, but much has been retained and is still in use. Find out what a mullet on field argent with stags rampant means in this Olde English episode of Stuff You Should Know. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Over the course of our lives, 80 percent of us will experience acne. Ultimately, acne comes down to one thing, a blockage in the sebaceous gland. Learn what makes a blackhead black, and everything else about zits, in this pus-filled episode of SYSK. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Did you know that science still doesn't know the exact origin of the moon? Do you know how the moon creates high and low tides? Do you know the difference between a waxing crescent and a waning gibbous? You will after listening to this riveting episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Gambling predates the written word; dice made of bones have been discovered at prehistoric sites. Today, the concept of amassing a fortune in moments remains attractive. Join Josh and Chuck as they take a look at the games and the glitz of casinos. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The World Trade Center was once a global symbol of progress. Since the attacks of Sept. 11, the area has undergone a massive rebuilding process. Chuck and Josh take a look at the World Trade Center, its memorial and its symbolism in this special episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Over the centuries, some scientists have concluded that the best test subject is looking at them in the mirror. Join Josh and Chuck as they explore 10 researchers, unsung or otherwise, who put their own health second to the advancement of science. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Instead of actually detecting lies, polygraph machines sense physiological variations, ostensibly brought on by guilt. The results are subject to interpretation, and therefore controversial. Join Josh and Chuck as they investigate the polygraph. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In 1964 The Prospect of Immortality laid out a plan for placing humans in suspended animation. The first person was placed in cryonic suspension three years later. But how does it actually work? Learn more about cryonics in this chilly episode of SYSK. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Up to 24 million people worldwide have schizophrenia. Despite the vast amounts of research, the disorder remains mysterious. In this episode, Josh and Chuck delve into the nature of schizophrenia, from the history of the disorder to the latest research. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The U.S. Government's Consolidated Terrorist Watch List keeps track of people who are known or suspected terrorists. But what how do people end up on it, and what happens if your name is similar to a suspected terrorist? Tune in to find out. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Years back, Josh recorded this show without Chuck, and the old version's omitted facts bugged him. In this new version, the pair delve into the people, science and rocket tests behind Murphy's Law. Join Josh and Chuck for this properly-executed episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The response to humor starts with electrical activity, potentially translating to physical responses that make up laughter. Science still can't pin down what makes one thing amusing and another not (which is pretty funny). Tune in to learn more. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

It's tough to predict the future. Instead, the future looks a lot like it does now: Faster data transfer rates, more social networking, ubiquitous mobile devices -- and possibly dumber people from using all this stuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In 1820, most of the drugs listed in the American Pharmacopoeia were plant-based; by 1960, it was a mere 5 percent. Yet in the late 20th century this trend reversed. Why? Join Josh and Chuck as they get to the root of ethnobotany and plant-based medicine. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

A condition known as chromhidrosis can be jarring: The sufferer excretes colored sweat from the eccrine or the apocrine sweat glands. Join Josh and Chuck as they explore this somewhat understood, but still bafflingly mysterious medical condition. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

SPAM is a canned meat product made from pork shoulder and ham. First introduced in 1937, this iconic food has spread to stores across the world. But what exactly is it, how did it get here -- and why is its shelf life "indefinite?" Tune in to find out. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Wildfires consume an annual average of 5 million acres in the US. But what causes wildfires? How do they become so powerful? More importantly, how do we fight them? Join Josh and Chuck as they take you to the frontlines of the fight against wildfires. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

While it's kind of perverted in the West, the concept of karma is a central tenet of several Eastern religions. Karma isn't just good or bad -- it's a natural law. Join Josh and Chuck to learn more about karma in this religiously respectful episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You smile because you're happy, yet happiness research suggests the opposite can also hold true. Smiling may actually improve your mood. Open interpretation make for the best SYSKs, so prepare for an old-fashioned academia studyfest with Chuck and Josh. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.