You have a golden opportunity to make yourself into a worthwhile human being simply by learning how to perform CPR. The chances are you'll never need to use it, but knowing how just in case never hurts. Listen to this episode to get you primed to take a course on real-life life-savin'. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Psst. You want to know how governments and corporations get the drop on one another? The frontline of intelligence is populated by spies. Learn about how spies get and transfer information (and why they do it) 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.

Over the last 400 million years, the day has grown longer by two full hours thanks to a slowing of the rotation of the Earth on its axis. While it will be a very long time before it stops spinning altogether, it never hurts to plan. Listen to Chuck and Josh discuss what a still Earth would look like. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You know the Beach Boys and you've seen those Hang Ten shirts with the little feet emblem, but there's a lot more to surfing than appears on pop culture's surface. From learning how to pop up on the board to the physics of how waves form and break to the Sport of Kings' Hawai'ian origin, learn all about surfing with Chuck and Josh. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

As is usual for SYSK, Josh and Chuck go over some, but not all, of the entries in this list of ten common myths about the brain. While it lives there in your noggin you don't really have much of a grasp on your brain and how it works. You think you do, but you don't. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

It was only since 1958 that the Jet Age began, and jet lag became a real condition. Also known as desynchronosis, jet lag can lead to all manner of ailments, from sleeplessness to irritability to diabetes and cancer. Learn about how the body's natural clock runs normally and what happens when it gets out of whack when we cross time zones quickly. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

It began with old-timey guys dropping dry ice on clouds. Since then weather modification was used to keep the 2008 opening ceremonies dry and flood the Ho Chi Minh Trail, but does it work? Learn about weather control plans, diabolical or otherwise. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You use it every day to overcome your lower self (which wants you to eat cake until your vision blurs) in pursuit of the goals of your higher self (which wants you to not develop Type-II diabetes). Yet it was only in the 1990s that researchers began to understand what makes our willpower and how it behaves. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

We're not so far off from being able to power our cars using beer and banana peels, like Doc in Back to the Future. Rather than solving the energy crisis with Mr. Fusion, though, we'll be taking advantage of a technique that's been in use for hundreds of years: creating syngas through pyrolysis. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Only 161,00 metric tons of gold has been mined in the entire history of the world. Considering about 85 percent of the precious mineral is recycled, there's a chance your jewelry may once have been part of an Incan headdress or Mycenaean face mask. Learn the ins and outs of this metal that humans have killed over for millennia. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

They get blown up, shot, drowned and thrown out of windows on the silver screen - and we don't even know their names. Stuntpeople are the unsung heroes of the movie industry. Learn the ins and outs of the stunt world and how one becomes a stunt person. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

With less than a million neurons in their tiny heads, bees shouldn't be able to do much more than eat, sleep and reproduce. And yet, bees are capable of high functions like population economics and navigating by the sun on overcast days. Learn about these fascinating insects, including what a stinger really is 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.

Fracking, the process of breaking trapped resources like natural gas and oil from shale, has led to a revolution in energy production in the U.S. It's also given rise to increasing worries that the process can have sweeping environmental impacts. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You know when you drop a piece of food and if you pick it up within five seconds it's still good to eat? Researchers have studied whether that's true or not and in doing so have inadvertently shone a light on how utterly covered our world is with bacteria and germs. Prepare to shudder 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.

One of the earliest civilizations we've detected, the Myceneans, kicked off the habit of creating a mask of a deceased person's face in deathly repose. What began as an ancient rite has only recently fallen out of practice around the world. Learn about this dignified but ghoulish custom with Josh and Chuck. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You've heard the warning before: If you're being chased on land by an alligator, run in a zig-zag. Of course, the average person should be capable of outrunning an alligator. Josh and Chuck take the opportunity to explore alligator safety anyway. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

From the moment it was established, the United States had headaches with terrorism of the pirate variety. For decades, the federal budget even include bribe money to pay them off. Learn all about this early threat on this episode of Stuff You Should Know. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

For centuries North American tribes have told stories of a hairy wild giant in the wilderness, and once Europeans arrived they claimed to see it, too. Chuck and Josh examine the claims of believers and the rebuttals of skeptics in this evenhanded episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You know those shows where people wearing sensible shoes jog dogs around in circles? They actually represent the pinnacle of a long and complex path to glory for dogs and their owners. Join Chuck and Josh as they peek inside the American dog show. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Kick back and raise a glass of eggnog to Josh and Chuck as they carry on a new holiday tradition of exploring the ins and outs of all things Christmas - and maybe even warm your heart along the way. Happy holidays, everybody! Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In this episode, Josh and Chuck explore the history, cultural impact and feminist ire raised by the Barbie doll. The boys are joined by Gordon Javna, the founder of the Bathroom Readers' Institute and publisher of Uncle John's Bathroom Reader. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Since Winston Churchill predicted we'd grow meat in a lab by 1981, researchers have considered doing just that. And thanks to the current work of about 30 groups, we may be only years away from mass-produced artificial meat. But will anyone eat it? Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The earliest depiction of a condom is found in a 15,000-year-old cave painting. Ever since humans realized sex led to children, we've been using condoms to prevent pregnancy. Join Josh and Chuck for this comprehensive tour of all things condom. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

A 2012 report showed that the U.S. may be energy-independent in just a few years, but not too long ago the specter of peak oil loomed large on the political and economic landscape. Join Chuck and Josh as they visit the consequences of running out of oil. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Out of obligation, Chuck and Josh mention Twilight, but it is the longstanding vampire lore that gets the most attention in this examination of how the bloodsucking undead evolved from baby-stealing demonesses to suave counts in our collective psyche. 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. Bonus: Chuck discusses his caving experience. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Ah, autumn - arguably the most beautiful time of the year, thanks to the vibrant colors trees put on display as they close up for the winter. Ever wonder why and how trees change color in the fall? Chuck and Josh have it down pat and explain it here. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Sure the fatcats get all the credit for donating millions, but did you know US households making $20,000 or less contribute the highest percentage of their income to charity? Learn more (not to mention a sexy look at the U.S. tax code) in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In 2009, a fertility clinic controversially offered parents the ability to customize their children. How will society take the idea of designing children? Do we have a moral obligation to design better people? Join Josh and Chuck for this heavy episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You know how when you do a lot of crystal methamphetamine you get meth mouth, where your teeth decay? Of course you don't! So check out this in-depth look on the most widely-abused hard drug in the world. Even tweakers will learn something new. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Star Trek was famous for its holodeck, a completely immersive holographic environment that could be any space a user wanted. Thanks to telemersion technology built for business conferencing, we're starting to get close to that holodeck after all. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Futurists have unnervingly predicted an impending moment in human history: the Singularity, when a superhuman artificial intelligence is created. What will become of humans? Enslavement? Extermination? Utopia? Find out with Josh and Chuck. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The Yakuza trace their lineage back to the 18th century samurai, left masterless following political upheaval, who turned to lives of crime. After centuries, the Yakuza is still going strong, following both tradition and new avenues of illicit revenue. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Josh and Chuck have been planning this thing since spring and it's finally here! Tune in to hear which listener's scary story won the SYSK Halloween Horror Fiction Contest -- and prepare to have your socks scared off just in time for All Hallow's Eve. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Since the 1960s, the Pentagon has called for a suit that can make a soldier jump higher, run faster longer and generally be a badder dude. It's only now that the materials needed are coming of age. Listen in to learn the state of exoskeleton technology. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

You probably can recite five right now. Commercial jingles are designed to hijack your working memory and implant a product or service and they really work. Learn about the history of these insidious and catchy advertising vehicles with Chuck and Josh. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Bossing a lion around in front of a crowd at a circus has been an attraction for 200 years, but exactly how lion tamers get their captive wild animals to comply has evolved over time. Take a peek in the jaws of this odd profession with Josh and Chuck. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

It wasn't too long ago when black holes were strictly predictions in theoretical math. Over decades, astronomy has gotten better at uncovering these cosmic phenomena. Learn about how black holes form and their ability to spaghettify you in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Sure it's everywhere and there's a more-than-90-percent chance you eat it once a month. But we'll bet you don't know the full history of that pizza (or tomato pie) you're about to chow down on. Join Chuck and Josh as they explain it to you, bite by bite. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

It's been called the world's lungs, the world's pharmacy and the world's air conditioner. It takes up only 6 percent of Earth's land, yet houses 50% of the world's species. Find out the math behind why they may be gone in 40 years in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Creating fire was possibly the most important human discovery, but it's easy to take for granted. But. Josh and Chuck get to the bottom of the chemistry of fire in their quest to explain everything in the universe. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Sure, Chuck and Josh have discussed it before, but it's worth revisiting: Running moonshine led to the creation of NASCAR. Chuck and Josh aren't even NASCAR fans and they think that's cool. Join them as the investigate moonshine runnin'. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

As ubiquitous as they've become, it's easy to overlook the marvels of engineering that are subways. Chuck and Josh go boring as they explore these systems of tubes that must circumnavigate rock, rivers, cables and more to get you where you're going. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

There's a secret war going on around us, and it's happening on a daily basis. The Air Force recently launched a new unit specifically designed to carry out and defend against cyberwar. Go deep into this new and alarming type of war with Josh and Chuck. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

A well-crafted piece of music can bring us to incredible highs and crushing lows, sometimes within the same song. Why does music affect humans this way? Join Chuck, Josh and special guest cellist Ben Sollee as they get to the bottom of music and emotion. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

There's a very good question that no one has yet satisfactorily answered: Where did life on Earth come from? Some look to the Red Planet as the source of life here, which, if correct, would make us all Martians. Is there anything to this out there claim? Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

If you want to control the masses, control what they read. After all, books are seeds that germinate new points of view. As a result, the struggle against banning books is contentious and continual. Learn more about banning books in this episode. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

When Alfred Kinsey conducted his sex surveys he turned up, but ignored, a fourth sexual orientation: people who don't experience sexual attraction. It took 60 years for Group X to gain a name and recognition, but with that has come increased scrutiny. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.