Fluoride is a common additive in toothpaste and the water supply of some countries. It's purportedly good for dental health, but some evidence suggests that it's actually harmful. Discover the dark side of fluoride in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

During World War II, Japanese soldiers adopted a version of the samurai code of honor. Fiercely commited to this ideology, some continued to fight even after the war ended. Learn more about these "stragglers" in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Competitive eating is a modern "sport" that's very popular in the United States. Join Josh and Chuck as they delve into the fascinatingly gross world of competitive eating in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Agent Orange was a potent herbicide used by the U.S. government during the Vietnam War. Learn more about the origins, use and devastating side effects of Agent Orange in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Whale sharks are the biggest fish in the ocean. Tune in as Josh and Chuck discuss these gentle giants, and recount their experiences swimming with them in the Georgia Aquarium, in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Tinnovators are folks who come up with new and innovative ways to use old Altoids mint tins. Learn about some of these "tinnovators" and their art in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

There are some pretty disgusting parasites out there, but Josh and Chuck have settled on three particularly gross ones. Tune in to learn more about flesh-eating parasites, guinea worms and tapeworms in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Is there a negative correlation between happiness and intelligence? Is ignorance truly bliss? Josh and Chuck attempt to answer this age-old question by exploring the "science" of happiness in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Most farms host crops and animals, but body farms specialize in corpses. Join Josh and Chuck as they tackle the fascinatingly gross phenomenon of body farms in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Toxoplasmosis is a parasitic infection that favors cats, but it can also be found in humans. Discover the disturbing details of how toxoplasma gondii finds a host -- and how it affects human beings -- in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Twinkies have a reputation for being so processed that they can last for years and years, but they're not as hardy as you'd expect. Uncover the sweet story of Twinkies in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Brainwashing is an extreme form of "thought reform," but does it actually work? 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.

The EPA tests vehicles for maximum fuel efficiency, but those impressive estimates don't always pan out in real life. Hypermiling is one sure-fire way to improve your fuel efficiency. Find out how it works in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

What makes the earth quake? Join Josh and Chuck as they explore the science and history of earthquakes in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

People who suffer with body dysmorphic disorder have a distorted, unhealthy view of their bodies. Learn more about this compulsive disorder in the following podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In a lucid dream, the sleeper is aware that he or she is in a dream state. Does that mean you can control these dreams? Where did this concept come from? Tune in to this podcast from HowStuffWorks.com to find out more about lucid dreaming. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The Peter Principle describes how workers who excel in bureaucratic systems are promoted until they reach their level of incompetence. Learn more about the Peter Principle in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The world's problems necessitate innovative solutions. Listen in as Josh and Chuck propose some innovations, from teleportation to an international language, that the world needs right now in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Carbon capture and storage is a way to filter excess carbon dioxide from the atmosphere and store it. Tune in as Josh and Chuck discuss current methods of carbon capture and storage -- and how feasible they are -- in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Many people associate Edison with the invention of electricity, but Nikola Tesla heavily shaped the electrical system we still use today. Get the dirt on the electricity wars between Edison and Tesla in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Hydrocarbons are simple compounds that help fuel the modern world, but they're not really a sustainable resource. Explore new energy solutions, starting with biohydrocarbons, in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The EPA defines a brownfield as land that is abandoned because redevelopment is complicated by possible environmental contamination. Tune in as Chuck and Josh examine the process of redeveloping a brownfield in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Scientists have proven that spontaneous combustion, or burning without an external ignition source, can occur in some objects. But what about human beings? Tune in and learn more about spontaneous human combustion in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Propaganda, a persuasion tactic typically associated with deception, has been around for centuries. Explore the history of propaganda -- and learn how to spot it -- in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

People have long believed that animals had mysterious powers of prediction. Do animals have a sixth sense? Is there any proof to back this belief up? Explore the fascinating subject of clairoyant animals in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Lobotomies -- brain surgeries to relieve psychiatric problems -- are rarely performed today, but they were once fairly common. Tune in to learn more about the controversial history and practice of lobotomies in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

These days, shopping for food can pose a dilemma. Should you buy regular, organic or local food? Check out this podcast from HowStuffWorks.com to hear Josh and Chuck discuss whether it's better to buy local or organic food. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

If you've ever watched a crime drama, you know that bodies get stiff after death. But why? Explore the biochemistry behind rigor mortis in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Lakes are usually tranquil bodies of water, but in rare instances, they can be deadly. Tune in to this podcast from HowStuffWorks.com to hear Josh and Chuck discuss lakes that have exploded -- and the factors that create a killer lake. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Humans aren't truly naked apes, but other primates put us to shame when it comes to body hair. Why? Tune in to hear Josh and Chuckle discuss the theories and hypotheses behind human hair growth and distribution. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In theory, credit default swaps are simply insurance against failed investments. In reality, these swaps can quickly get complicated. Tune in to this podcast from HowStuffWorks.com to hear Josh and Chuck demystify credit default swaps. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

High fructose corn syrup gets a bad rap, but is it deserved? Tune in as Josh and Chuck discuss the origins of this ubiquitous sweetener -- and why it's not so sweet for your health -- in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Believe it or not, scientists and doctors have discovered a way to transplant part -- or all -- of a face from one person to another. Tune in to this podcast from HowStuffWorks.com to learn more about the astonishing practice of face transplants. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

How much money does a person or a family need to live? Josh and Chuck are curious to find out, too. Tune in to this podcast from HowStuffWorks.com to discover how needs, wants and peer pressure affect the amount of money we need to live. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Toads have a reputation as wart-spreaders, but they're not actually to blame for the unsightly growths. Viruses are. Tune in to this podcast from HowStuffWorks.com to get the skinny on toads, warts and viruses. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Money laundering -- the practice of disguising illegal funds -- can be domestic or international in nature. Join Josh and Chuck as they take a look at the history, practice and future of money laundering in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

There's been a lot in the news about Ponzi schemes lately. How do they work? And who's Ponzi? Check out this podcast from HowStuffWorks.com to discover how an Italian immigrant created a classic con that's still fleecing investors today. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You'd think that centenarians -- people age 100 and older -- would owe their longevity to healthy habits, but that's not always the case. Tune in to this podcast from HowStuffWorks.com to learn more about genes, longevity and unhealthy habits. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

When it comes to shucking this mortal coil, no two deaths are exactly alike -- and some are truly bizarre. Tune in to this podcast from HowStuffWorks.com to hear Josh and Chuck discuss some of the strangest deaths imaginable. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

According to the Mayan calendar, a new age will begin on December 21, 2012. Will this mean the end of the world, or just a transition? Tune in as Josh and Chuck discuss whether 2012 will be a bad year for the planet or not. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Every year, adventurers brave the elements and attempt to reach the summit of Mount Everest. Yet dangers abound, and more than a hundred bodies litter the mountain. Listen in and learn more about Mount Everest in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Does this episode seem strangely familiar? If so, you might be experiencing déjà vu, a topic that scientists are beginning to study seriously. Discover the myriad theories about how déjà vu works in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Anger gets a bad rap, but this unpopular emotion can actually be beneficial to us. Tune in to this podcast from HowStuffWorks.com to get Josh and Chuck's entertaining take on why we lose our cool. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Microexpressions are brief facial cues that reveal a person's true intentions. Listen in as Chuck and Josh discuss the subtle art of reading faces in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

For thousands of years humankind has pursued the enhancement of sexual pleasure and performance through a plethora of medicines and practices -- but how many aphrodisiacs actually work? Listen and find out in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

International waters cover 71% of the Earth's surface, and a separate set of laws and regulations govern human activity on the seas. But who actually owns the oceans? Listen and find out in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

When a person has alien hand syndrome, his or her hand can move involuntarily, and seemingly of its own volition. Tune in and learn more about this misunderstood syndrome in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

When Allan Snyder discovered that transcranial magnetic stimulation produces strange cognitive changes, he believed he'd stumbled upon a "creativity-amplifying machine." Learn more about the real-life thinking cap in this podcast from HowStuffWorks.com. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.