Pigeons can get a little confusing. Passengers, messengers, carriers, homing - the list goes on. But when it comes down to it, they're all variations of the same smart bird with a knack for getting home to roost. Learn about these clever creatures in today's episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

We've covered our fair share of pop-culture icons and here is another - Hula-Hoops. They've been around since ancient time in some form or another, but made their name in during the Hoop Boom of the 1950s. Learn all about this popular fad and more. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

What began as a challenge to an oil engineer to make a terrible singer into a pitch-perfect one, Auto-Tune has become a ubiquitous (and, to many, obnoxious) part of the musical soundscape. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Droughts can be an inevitable feature of a local climate or a catastrophic result of human meddling. Learn the ins and outs of droughts including the American mother of them all, the Dust Bowl. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Since the Kepler telescope went online, astronomers have found there may be an estimate 40 billion planets like Earth in the Milky Way galaxy alone. What does it take for a planet to be considered Earth-like? Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

They are creepy, sure, but they are also useful, cute and in great danger of extinction. Get a new lease on life from a new view of bats in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

At its base, criminal profiling is a legitimate investigatory tool. The Supreme Court has drawn a clear line that bans profiling when it includes race. So why do we still do it? Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

About half of all people experience rage on a daily basis when they get behind the wheel. What is it about driving that ticks us off so badly? Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In some states, it is not only your right but your duty to arrest someone you see committing a crime. Learn all about why you should basically never do that in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

During World War II, Nazis invaded the United States with saboteurs bent on fomenting chaos. Three times. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In 1974, Chinese farmers discovered the first of what would number 7,000 terracotta soldiers meant to protect China's first emperor in the afterlife. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

What began as a pair of teens who made a film for their grandparents has exploded into its own art form. Learn all about how stop-motion Lego films are made. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Pyramids can be found in ruins around the world, but no civilization perfected the feat of engineering like Pharaonic Egypt. Learn about the mysteries that still surround these giants. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Don't be confused - this one is about actual circus acts made of family members, not the controversial comic strip. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Did you know some of our most beloved movies originally had different, sometimes better, endings? That is until they were tested in front of focus groups. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Sun Tzu said know your enemy, and so it is in this spirit that we present this episode on one of the worst airborne pests in the world. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Well-planned landfills have only recently come into widespread use. Recently, waste managers have found that they work a little too well and now the landfill is being reinvented. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

What do little baby ducklings have to do with Nazis? A lot actually. Find out about animal imprinting experiments and the debate over their ethics. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You should never BASE Jump. It is one of the most genuinely dangerous sports on the planet. But with that out of the way, you should definitely learn all about this pastime where people jump from tall structures and outcroppings for fun and thrills. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

From prehistoric logs across streams to the 102-mile Kunshan Grand Bridge, nature works ceaselessly to take down spans. Learn about the fascinating ins and outs of bridge design and building and the mind-boggling challenges structural engineers face. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In 1977, Ohio State astronomers discovered a radio transmission from space that was 30 times louder than the cosmic background noise. Since then every explanation of what it was has fallen short and the Wow! Signal remains possible evidence of alien life. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

It's easy to overlook the importance of ocean currents - they move along out at sea, while we stay mostly on land. But we are globally affected by them every day. Currents form the base of the food chain, drive weather and keep life as we know it going. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The street gang problem in America peaked in the 1990s, but recent FBI reports find that gang membership doubled from 2006-2011. What's driving this increase, and gangs in general? Wander into gang territory with Josh and Chuck in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Tupperware won immediate design acclaim when it was released in 1947, but it took a pioneering female executive to make a line of plastic food storage into an icon of the American postwar boom. Learn about the surprisingly intriguing history of Tupperware. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Junk food is literally that, empty calories of energy that provide little nutritional value and usually are stored as fat. Yet junk food is irresistible and for good reason - companies spend tens of millions engineering it to be that way. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Science doesn't have a good explanation for why we sense color, yet it is everywhere and affecting us all the time. But why should minutely different wavelengths of light have such an impact on our moods and motivations? Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Some of it seems innocuous enough: protecting kids from unseemly sites or intellectual property from piracy. But the tools to protect these things are the same that governments can also use to censor ideas and quell dissent. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Tens of millions of Scouts, and their parents, have taken standard blocks of wood and turned them into cars that zip along at up to 20 mph. Learn about the origin, physics and more of Pinewood Derbies in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The FDA was the first consumer protection agency in the US. Since 1906, it's been issuing regulations meant to protect Americans from tainted food, ineffective drugs and pacemakers that don't work. But is the FDA too cozy with industries it regulates? Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Around ages 9 or 10 a boy will begin to undergo a magical, surprising, weird, amazing, totally bonkers transformation from childhood to adulthood. To separate fact from myth, Chuck and Josh take on the role of gym teachers and wade into male puberty. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Physicians noticed centuries ago that people exposed to cold temperatures often have amazing recoveries from serious medical emergencies. Now medicine is learning how to purposefully induce hypothermia in order to buy time to fix otherwise fatal trauma. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Spiders are second only to snakes in the dread departemnt, but they're actually very helpful arachnids who are only deadly to humans under the worst case scenario. Of the more than 40,000 species, very few spiders are even venomous to humans. Learn everything you ever needed to know about these 8-legged wonders in today's episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Water slides have been around in one form or another since the Romans. But back then they didn't know what they had on their hands. With the birth of the waterpark in the 1970s, these rides have only gotten more extreme, leading up to the birth of today's water coaster. All this and more in today's episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

If you think snakes are legless reptile carnivores, then you are exactly right. If you think snakes are here to kill you then you are exactly wrong. Learn more about these fascinating and undeservedly condemned animals in today's podcast episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Jesters of some sort have been around since ancient Egypt and China. Our modern clown was invented around 1800 and ever since they have been getting steadily creepier. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In 1968, Paul Erlich published The Population Bomb, predicting coming famine and mass death. Erlich's predictions didn't pan out but his ideas launched a debate still raging today. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

It has been called a "glorified spring", but Slinky is one of the best selling toys of all time. From accidental origins to an unlikely resurrection, Slinky has a pretty great back story. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Blood types have one of the more interesting backstories in medical history. But as much as we've figured out about them and how they work, we still don't know much about why we even have different blood types. Listen in for a truly fascinating look at your most essential bodily fluid. 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 dive into the world of polyamory. Turns out polyamorists aren't weirdos and deviants, they're just regular folks looking for love from more than one person. Learn all you ever needed to know about this unique, but not so modern arrangement. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Happy Easter from Stuff You Should Know! Learn all about Easter, from its humble beginnings as a pagan holiday to the multi-billion dollar industry it is today. We'll cover the Biblical and religious aspects, along with the origins of some of Easter's greatest traditions. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Does the human body really replace itself every few years? The answer is yes, but different parts of the body do so at different rates. Learn all about which parts of your body are the speediest, and which take the longest to regenerate. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Why would people want to remove salt from water? To solve the world's water problem, that's why. Learn all about the efforts to desalinate H2O in cheaper and more efficient ways. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Medical science has a long and storied history of trying out cures and procedures that later strike us as wacky. And they're still at it today! Learn about bizarre treatments, from opium for children to tobacco smoke enemas in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Despite tons of people using cotton swabs each day to clean the earwax from their ears, cerumen (as earwax is clinically known) is actually quite beneficial to the health of your ears - and even kind of ingenious as your body's defense goes. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The use of general anesthesia is less than 200 years old. Before doctors were able to cause unconsciousness in patients, surgery was brutal for all involved. But despite this advancement in medicine, science still has no idea how it works. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Legend has it that tea was discovered by a curious Chinese emperor after leaves blew into his boiled water. Now tea is the second only to water in popularity worldwide. And despite the varieties of tea, they all come from a single species of plant. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Fleas are the bane of the existence of pet owners. From their eggs to their lifespan to their feeding habits, fleas are practically designed to be a nuisance. They are parasites, after all. Get down on flea level with Josh and Chuck in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Even as far back as the Roman invaders, people have had absolutely no idea just what the massive monument complex in England known as Stonehenge was built for. Join Josh and Chuck as they try to get to the bottom of this Neolithic mystery. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.