Josh and Chuck discuss the Braille alphabet -- from its origins in Charles Barbier's "night writing" system to the many different types of tactile alphabets that exist today -- in this episode of Stuff You Should Know. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Witches are perhaps one of the most reviled and misunderstood groups in history -- but why? Join Josh and Chuck as they break down the Stuff You Should Know about witchcraft in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode, amateur anthropologists Josh and Chuck discuss urban legends, from how they're defined to some classic examples you've probably heard yourself. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode of Stuff You Should Know, Josh and Chuck discuss SWAT teams, elite police units that are specially trained for extreme situations. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode, Josh and Chuck discuss whether there are any truly "undiscovered" groups of people left on the planet, the definition of undiscovered -- and why groups might want to avoid modern civilization. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Ninja, Japanese warriors famous for stealth, deception and sabotage, were inspired by Chinese military philosophy. Join Josh and Chuck as they explore the origins, history, gear and popularity of the ninja in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this disaster-themed episode of Stuff You Should Know, Josh and Chuck ponder ways the world could end -- and how projects like the lunar Doomsday Ark propose to save humanity. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode of Stuff You Should Know, Josh and Chuck examine the various factors that have caused honeybee populations to decline -- and what you can do to help the honeybees. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Tune in as Josh and Chuck take a detailed look at organ donation -- from the earliest organ transplants to the organ black market -- in this episode of Stuff You Should Know. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Mercenaries are soldiers of fortune who fight in wars and conflicts for profit. Join Josh and Chuck as they explore the fascinating history of mercenaries past and present in this episode of Stuff You Should Know. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Noodling is a type of fishing in which the participant uses his or her hand in lieu of fishing gear and bait. Discover the origins and practices of this unusual "sport" in this episode of Stuff You Should Know. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Human experimentation is an age-old practice, dating back to 4 BCE. Listen in as Josh and Chuck give you the low-down on the historic, grisly underbelly of science and medicine -- human experimentation. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Although today's pirates aren't storming the coast of Florida or other eastern states, piracy is still around in this modern age. Join Josh and Chuck as they look back at the history of piracy -- and its successors -- in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

On Christmas eve, Josh and Chuck decide to take that ineffable Stuff You Should Know approach to the celebration known as Christmas. Join the guys as they unravel the mysterious historical roots of the holiday's evolution in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode of Stuff You Should Know, Josh and Chuck discuss the origins and complications of concussions, injuries in which the brain comes into contact with the skull. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode of Stuff You Should Know, Josh and Chuck discuss kleptomania, a disorder in which people have an overwhelming impulse to steal unnecessary items. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode of Stuff You Should Know, Josh and Chuck discuss Narco States, places where illegal drugs are traded openly with government support -- or without government interference. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode of Stuff You Should Know, Josh and Chuck discuss the notorious Hells Angels Motorcycle Club, more commonly referred to as the Hells Angels. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode of Stuff You Should Know, Josh and Chuck discuss the Large Hadron Collider, from its purpose and origins to how likely it is to wipe out all life in the universe. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The concept of a near-death experience is well-known in popular culture, but we still don't know why these seemingly supernatural events occur. Josh and Chuck explore the myriad theories that attempt to explain near-death experiences in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Why do we crave certain foods? Does everyone experience food cravings? In this episode of Stuff You Should Know, Josh and Chuck explore the delicious topic of food cravings. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode, Josh and Chuck explain the finer points of hostage negotiation, including the symbolism of hostages, the negotiator's goals and tactics, Stockholm syndrome -- and what happens when people refuse to negotiate. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode of Stuff You Should Know, Josh and Chuck discuss nuclear profliferation, nuclear parity and the Cold War strategic doctrine called Mutual Assured Destruction (MAD). Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The world is full of festivals, some of which are really odd. Tune in as Josh and Chuck take a playful look at ten unusual town festivals in this episode of Stuff You Should Know. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

If you've ever wondered where the expression "low man on the totem pole" comes from, this episode of Stuff You Should Know is a must-listen. Tune in as Josh and Chuck take a look at the origins, symbolism and history of totem poles. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Population may not seem like the most scintillating topic in the world, but Josh and Chuck beg to differ. Join them as they explore how population works, from demographics to population control, in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The US and England have databases containing DNA from millions of citizens. Originally only criminals were included, but as the programs expanded many more people were added. Learn how these databases work -- and why they were built -- in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode of Stuff You Should Know, Josh and Chuck take a look at the advertising practice of product placement, from its origins to different types to classic examples in film and television. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Some people have memories of very early childhood, but how far back can you go? Is it possible to remember your own birth? Josh and Chuck are on the case in this episode of Stuff You Should Know. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this Halloween episode, Josh and Chuck go way back to late 19th century London to examine the grisly details of the Jack the Ripper murders. They also discuss Ripperology, Jack the Ripper suspects and theories, and the legacy of the murders. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The Witness Protection Program, or the Witness Security Program, was established in 1970 to protect government witnesses before, during and after a trial. Learn more about witness protection in this episode of Stuff You Should Know. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The Cannon Ball Run is a cross-country car race famously portrayed in the campy 1981 movie "Cannon Ball Run." But it isn't fictional. Tune in as Josh and Chuck take you on a wild ride through the real (and colorful) history of this infamous race. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

China's one-child policy, implemented in 1979, was designed to limit population growth. In this episode of Stuff You Should Know, Josh and Chuck examine the policy's surprising origins, impact on Chinese culture, and pros and cons. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

After a night of heavy boozing, many partygoers find themselves the victim of a hangover. But what exactly is a hangover, and what causes it? Join Chuck and Josh as they break down the science behind hangovers -- and how to avoid them -- in this podcast. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Ever wondered about the history of your house? In this episode of Stuff You Should Know, Josh and Chuck give listeners some pointers on determining the history of a house. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Columbus is often touted as the "discoverer" of the Americas, he wasn't the first to set foot on American soil by a long shot. Tune in as Josh and Chuck dig deep into the history -- and mystery -- of the first American inhabitants in this podcast. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this final installment of their 4-part suite on health care, Josh, Chuck and Molly take a tour of health care systems around the world, from France to Switzerland. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

How do you measure happiness? How do you measure it on a national scale? Tune in as Josh and Chuck discuss Bhutan's Gross National Happiness index in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this third episode of Stuff You Should Know's health care reform series, Josh and Chuck -- and special guest Molly Edmonds -- sort through the myths, rumors and truths behind President Obama's proposed health care plan. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In movies and stories, zombies are undead menaces that lurch around mindlessly, in search of flesh -- and braaaaaains! Where did the idea for zombies originate? Do they exist outside of fiction? Tune in to this podcast from HowStuffWorks.com to find out. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this special episode of Stuff You Should know, the second in a four-part series, Josh and Chuck -- and a special guest -- discuss President Obama's proposed health care plan in detail. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

A dog that knows exactly when its owners will arrive home every day seems to have a human perception of time, but in fact, they perceive time very differently than we do. Find out more about how dogs view time in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The United States is abuzz with talk of health care reform, but why does the system need repairs in the first place? Josh and Chuck explore how the current American health care system works (and doesn't) in this episode, the first in a four-part series. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Microlending is a practice that provides funds for entrepreneurs in developing countries who couldn't normally get loans. Tune in as Josh and Chuck discuss the pros and cons of microlending in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Armed with only a GPS and a sense of adventure, geocachers use their wits to locate containers across the world. Join Chuck and Josh as they explore the history, practice and strange origin of geocaching in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Each year, the Ig Nobel Prize is awarded to researchers for unusual -- and generally humorous -- contributions to science. Tune in as Josh and Chuck discuss the highlights of this unique awards ceremony in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Today, automobiles are undoubtedly the dominant form of transportation in the United States, but that wasn't always the case. Join Josh and Chuck as they explore the history of public transportation and automobiles in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Jim Henson's Muppets, including the beloved Kermit the Frog, first came to life in the mid-1950s. Join Josh and Chuck as they explore the history and nitty gritty details of the world's most famous puppets in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.