Herd immunity is an epidemiological concept that if enough people are inoculated against a disease the rest of us won’t get it. It’s been useful in holding back diseases like polio and measles, but we have vaccines for them. We don’t have one for Covid-19. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Entrances to the underworld have been places of wonder for eons, and humans have ventured into caves to sleep, hunt, create art and explore. Thanks to the hobby of caving, that tradition continues today. Get all this plus Chuck discussing his caving experience, in this classic episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The zipper may be the most unsung invention we humans have ever come up with. Prior to zippers, everyone walked around like idiots with nothing but buttons to hold their clothes together. The zipper changed all that. The zipper changed everything. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

There was a glorious time in American history when circus sideshow performers lived together in a small town in Florida. Learn about the fascinating history of Gibtown today! Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Spartacus was a real dude. He led a slave revolt, and was pretty successful to boot. I'm Spartacus. You're Spartacus. We are all Spartacus. 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 classic episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Agatha Christie was a great writer of murder mystery novels and is probably the best selling author of all time. Listen in today to learn her story. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Business in the front, you know the rest. Listen in as we discuss the lifestyle choice that is the mullet. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

An existential risk is a special kind of threat that are different from other types of risks in that if one of them ever befalls us, it would spell the permanent end of humanity. It just so happens we seem to be headed for just such a kind of catastrophe. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Back when this episode aired, the USPS was teetering on the edge of going under and there were a lot of plans on the table to save it. With the USPS again at risk now for different reasons, join Chuck and Josh as they explore the history and future of the postal service in this classic episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

As part of a super 70s push to get Earth to a seat at the table of the Galactic Federation (in case there is, in fact, such a thing), astronomer Carl Sagan oversaw an ambitious project to launch a compilation of Earth’s greatest hits into deep space. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Today Chuck and Josh take a shallow dive in the warm pool that is the NY Times Crossword Puzzle. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Today, Chuck and Josh dive into the funky, cool world of the classic TV show, Sooooooooul Train. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Yes, it's true: Unions have a shady mob-related past and were originally championed by anarchists. Born from medieval trade guilds, these organizations also helped grow the American economy, and not only protected but established workers' rights. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

All that gross stuff we humans put in the water that gets flushed down the sewers has to be taken back out before that water is reintroduced to the environment. That’s the ideal, and it’s essential to staving off the imbalance people bring to the planet. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

It’s a typical human reaction: When you’re driving and you realize that you’re lost, you turn down the radio. On its face it makes no sense – or does it? (It does.) Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

We all know the benefits of bidets. But with toilet paper in short supply, they're more important than ever before. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Dissociative Identity Disorder was known as multiple personality disorder until a case of mass hysteria brought on by the movie-mad public and unscrupulous psychiatrists led to a stigma over the term. Now psychiatry has gotten serious about the condition. Learn more in this classic episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Becoming the first licensed woman physician in America was tough, convincing male surgeons to wash their hands between patients was even tougher. Today Josh and Chuck pay tribute to a genuine pioneer in medicine and society. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In the go-go 80s and 90s, American Airlines offered the AAirpass, a lifetime pass for unlimited first class travel. It was an amazing deal, but AA didn’t predict just how much some travelers would use it. They played with fire, they got burned. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

As if being murdering SOBs weren’t enough, the Nazis were also thieving rats. During WWII, they stole billons in gold from countries they overran and moved it to Germany. But at the end of the war, only part of it was recovered. Where’s the rest? Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Perhaps you didn’t realize that when you search the web you’re only skimming the surface. In fact, the types of web pages that turn up in your search engine results represent only a mere fraction of the total web. Immerse yourself in the Deep web and its dark corners in this classic episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Student loans can be pretty complicated. Luckily Chuck and Josh are here to wade through the financial muck for you. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Today, Chuck and Josh dive into that scary number...666. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Chuck and Josh explore the age-old question: Should you train your dog by treating it like a living, feeling being or should you beat them up and break their spirit? Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The world’s energy consumption is ruining the planet but for decades physicists have been working on what could solve the world’s energy and climate change woes for centuries to come – nuclear fusion. Learn about building stars on Earth in this classic episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

We’re in the middle of an odd, tense time and Josh and Chuck are here to explain what’s going on and how to stay safe.  Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

One day in 1967, Sweden changed what side of the road its citizens drive on. It went surprisingly well, considering. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

An old idea – giving every resident of a country a set amount of money every month with no strings attached – became a hot item in Silicon Valley and on the 2020 campaign trail. Could it alleviate the impending job loss coming from automation? Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Viruses are big jerks that invade regular cells and hold them hostage, making you sick while they're doing it. Learn everything you ever needed to know about viruses, including how the common cold works, in this classic episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

We’ve already recorded an episode on The Muppets, but Jim Henson was such a neat guy we delved into him even further. Learn all about the man behind the Muppets who was so much more than just a master puppeteer in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Join Josh and Chuck live from Vancouver as they dive in to the ins and outs of one of the oldest businesses in the world – the bar! Learn about the history of bars, cocktails and the good people who put them together in new and amazing ways. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

There’s nothing more boring than watching grass grow, which is why Josh and Chuck aren’t asking you to do that. Instead, you can learn about all sorts of neat things about grass - like how American became obsessed with perfect lawns - in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

A lot of great thinkers are warning that if humans are to survive as a species we are going to have to find another planet to live on. Terraforming, or engineering a planet to maintain all of the ingredients to sustain life, seems to be the answer. 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.

The legend of King Arthur is very old and very established. By the time the king who saved Britain and united it was first written about, his story was already hundreds of years old. And while many of the details of his life and adventures, from the Lady of the Lake to Merlin the Magician, seem fictional some archaeologists believe that Arthur -- and much of his life -- was real. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The soda we get instantly mixed at a fast-food joint owes a lot to a rich history going back to the Roman baths, that features drugs, diseases and explosions. Learn all about soda and soda fountains in this surprisingly interesting episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Other comedians cry on the inside, but Rodney Dangerfield built his entire act around his sad life. Get to know this legendary comic who was nearing 50 when he got his break. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Pinball was actually illegal until the 1970s in NY and other cities, hidden in the backs of pornography shops. The game was finally legalized, thanks to a Babe Ruth-style shot by the best player in the world. Learn all about it with Josh and Chuck. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Since sugar spread from Polynesia a few thousand years ago, the world has been crazy for it. Insanely high prices, wars and even slavery couldn't undo world's need for a sugar fix. Today that fix is responsible for the obesity epidemic facing the West. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The battle between Britain and Argentina over the rocky, cold Falkland Islands is one of the weirder wars in history. Learn all about it today! Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The American Pledge of Allegiance is much more interesting than you might think. Give us 12 minutes and we'll fill you in. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Today Chuck and Josh sit and converse on the simple, elegant chopstick.  Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Since more than 1 billion people have played it, you’re probably familiar with the board game Monopoly, but we bet you don’t know its secret origins as a left-wing socialist teaching tool. Join Josh and Chuck as they chase it down in this classic episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

A few decades ago, some people who liked to climb mountains decided they wanted to make it even harder and ice climbing was born. If you think rock climbing is difficult, put on your base layer and join Josh and Chuck on the glacier. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In the annals of American justice there is a 1977 case where the police were tipped off to the identity of a murderer by a woman who said she was possessed by the victim. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The coyote truly is wily. Even after a century-long attempt to drive them to extinction, this close relative of domesticated dogs not only hung onto survival, but actually doubled its range and expanded its population. Coyotes are here to stay. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

As of early 2013, only 161,00 metric tons of gold had been mined in the entire history of the world. Considering about 85 percent of it is recycled, there's a decent chance your jewelry may once have been part of an Incan headdress or Mycenaean face mask. Dive in to gold in this classic episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.