Someday, your car could have a one-cylinder engine under its hood that has 100 horsepower, gets 100 miles per gallon and can run on any type of fuel. What if someday was just a couple years away? Meet the Grail Engine.

Carlos Slim, head of the Mexican telecommunications giant America Movil SAB, was recently announced as the richest man on Earth, with a net worth of $68.5 billion. How much money is left for the rest of us?

A free, can't-miss event at SXSW Interactive this year: Chuck, Josh and special guests will present a super-exclusive sneak preview of their new TV pilot "Stuff You Should Know," airing on Science Channel later this spring. What other surprises could be in store?

As science advanced from philosophy to empirical knowledge, groundbreaking discoveries -- like the five on this list -- revealed a lot about the reproductive equipment inside human bodies. Which revolutionized our understanding of sex the most?

Regular wallets are sooooo 2012. Could their digital doppelgangers be just around the corner?

A recent study by the American Journal of Clinical Nutrition found that chocolate lowered blood pressure slightly among participants. Does a chocolate a day keep the doctor away? Before you stock your fruit bowl with chocolate bars, you might want to read this article.

Doing your taxes is already stressful enough, but imagine how much worse it could be if you forget to bring your W-2 form. Here are a few more must-haves you should bring along on a visit to your tax preparer.

It certainly takes a lot of concentration and hand-eye coordination to juggle. But can you actually improve your brain activity by tossing a few pins in the air?

On March 4, 1789, the United States Constitution went into effect. This is a document with serious history, and many people learn all about it in school -- well, maybe not all about it. This Constitution Day, test your knowledge of some lesser-known facts about the U.S. Constitution.

For Justin Bieber's 18th birthday, his manager surprised him with a Fisker Karma -- a $100,000 electric car. There's little doubt that the 2010 Fisker Karma, a plug-in hybrid electric vehicle, has the looks to compete with any luxury sedan currently on the market. But how does the Fisker Karma perform?

Forget free sodas and nominal gym discounts. Some of today's employers are wooing workers with ever more creative, desirable benefits that help improve employee retention and productivity. Which ones seem almost too good to be true?

Leap day brought the chance to download the beta release of the next version of Microsoft's server platform, along with the Windows 8 Consumer Preview and first looks at the next versions of its developer software. How did a college dropout start a world-renowned tech company and become the world's richest man? The story is fraught with half-truths, and we debunk five of them here.

Job searches have changed dramatically since the economy started struggling back in 2007. Companies can be choosy about their new hires, and job seekers have to jump through hoops to get hired. Sometimes, the position isn't really worth the effort.

If at first you don't succeed, launch a new online social network. Google's Orkut failed to hit the big time on the world stage, but could Google Plus challenge Facebook for the title of King of Social Media?

Would the people of the world get along better if they spoke the same language? Or would it just be easier for us to hate each other?

The Costa Allegra cruise ship arrived in port on Thursday after a fire left it adrift in the Indian Ocean on Monday. What does it take to keep these floating luxury cities safe, and what prevents them from sinking like a brick?

Thursday, Marvel Entertainment and Disney Interactive Media Group announced that the first social game based on Marvel characters, "Marvel: Avengers Alliance," is now live on Facebook. When you think of comic books, you might conjure up images of geeky adolescents, superheroes in stretchy tights and flimsy little booklets. But there's way more to this game-changing, generation-spanning art form.

Sending in your resume on a cake? Asking how many "hot chicks" work for the company? We've pretty much heard and seen it all, so we're going to tell you what not to do during your next job interview.

Rail guns leave gunpowder-based weapons in the dust (one can hit a target 250 miles away in six minutes). The U.S. Navy has just successfully fired a prototype of one.

Uggs -- fleece-lined sheepskin boots -- got their name for being more functional than aesthetic. An unlikely haute couture trend of the 1990s spawned from handmade surfer wear, uggs have since been adopted by people of all ages all over the world. But how much do you know about uggs' history -- and can you tell the difference between an UGG, an ugg and a fake UGG?

Even if you’re a die-hard fan of “Sesame Street” and “The Muppet Show,” you can’t possibly know all there is to know about Jim Henson and his work … or can you? Take the challenge and find out!

What tools will get your motor running, get that hole in your wall spackled, or help you fix a leaky pipe? Take this quiz to see if you are a tool-time know-it-all.

Although the wonder of human flight has become commonplace, misinformation and rumors abound about airplanes and air travel. Do you, dear frequent flyer, think you can tackle our quiz?

A car's transmission enables the engine to provide a wide range of output speeds. Without it, you'd be limited to just one gear. Test your knowledge of both automatic and manual transmissions in this quiz.

It's hard to believe that only about 15 years ago, the Internet was a strange new world. Now it's difficult to imagine life without it, but how much do you really know about the Internet?

Exotic cars inspire a legion of car enthusiasts to empty their wallets for a taste of life in the fast lane. Will you be at the front of the pack after racing through the exotic car quiz?

Sports stadiums can be gigantic achievements of architecture and art, and it's almost guaranteed that each new one will try to outdo what came before. How much did some of the most famous sports arenas cost?

How much do you know about the quixotic mastermind behind Apple? The black turtleneck and jeans, the theatrical key note speeches and his legendary temper are just a small part of the story.

Apple has sold tens of millions of iPad tablet computers since their release in 2010. If you haven't touched, tapped or swiped on one, you will soon enough. Get up to speed with our quiz, and find out just how much you know about Apple's iPad.

Most of us think we know when to use commas and when to leave them out. We went to elementary school, after all. Still, be it all those years without grammar lessons or an initial misunderstanding about this all-important piece of punctuation, so many of us get it wrong from time to time ... do you? Test your comma knowledge and find out if you know your stuff!

Old fish, new fish, bold fish, blue fish. It seems that Dr. Seuss was on to something when he wrote "One Fish, Two Fish, Red Fish, Blue Fish." Take catfish, for example. They're blue, big and bold. But how do you go about making the big catch?

Riots can break out in an instant, if the right trigger hits at the right time. Trained riot control specialists do a lot more than crack skulls. Grab your shield and take this riot quiz -- if you know what's good for you.

Earthquakes, like volcanoes, happen all the time -- but most of them are so minor we can't even feel them. They're also similar to volcanoes in that we can't fully predict them, and scientists are always waiting for the next big one to occur.

If you happen to have $100 million lying around, hey, you're in luck! Almost all of these behemoths were actually on the market at press time. Grab your diamond-encrusted cell phone and call your realtor before some other gazillionaire does.

Usually, differentials are where a car's power makes its last stop before spinning the wheels. They also enable those wheels to rotate at different speeds. Find out how well your wheels are spinning with the differential quiz.

Albert Einstein was a pretty smart guy. When you look up the word "genius" in the dictionary, so the saying goes, it's a pretty safe bet you'll see Einstein's mug. He introduced concepts that we're still figuring out how to explain.

Even if you own a high-definition television, you might not be exactly sure how it works or how to optimize your viewing experience. This quiz won't tell you what HDTV is best for you, but it might help you sort out some of the mystery.

With more than 800 million members and counting, Facebook is one of the fastest-growing phenomena to come out of a college dorm room. What do you know about Facebook?

Time magazine declared the first 10 years of the 21st century the "Decade from Hell" -- what else would you call a decade that started off with the deadliest terrorist attack in history and ended with global economic collapse? How well you remember the events that happened in the years from 2000 through 2009?

Military snipers have been great fodder for video games and movies, and they're just as interesting in reality. Test out your skills here on Stuff You Should Know's military sniper quiz.

As Benjamin Franklin once quipped: "There never was a good war or a bad peace." That's why these five countries have gotten out of the military business entirely.

Abandoned cities, haunted buildings, eccentric rituals and unexplained relics -- what bizarre stories do these peculiar islands have to tell?

Organizing your home is never easy, but there are ways to simplify the process. Until they invent technology that will actually do the work for you, these apps will help you get everything done.

From the Two-Headed Nightingale to the Baboon Lady, these 10 female sideshow freaks sure knew how to put on a show. But what were their real stories?

Torture was a very popular form of punishment in the Middle Ages, but it also served as a social deterrent and as entertainment for the masses. These 10 devices show how creative torturers became with their tools in an effort to wow the crowds.

Building a financial future, whether for retirement or simply for attaining your personal goals, all starts with saving. What are some easy ways to stash some cash for later?

Sometimes, there are things we do as part of a tradition without really considering where the practices may have started. What are some the common traditions we take part in today that may have surprising origins?

If you're hungry for a Lums steamed hotdog, a Gino Giant burger drenched in sauce or some Chi-Chi's nachos, well, that's too bad. Those restaurant chains no longer exist.

Most of us know that a house must have a well-insulated building envelope to be structurally sound. But we may not know how important this shell really is. These are 10 types of insulation that can protect your home.

Unemployment can cause stress, but some jobs are more stressful than others. The next time you find yourself sweating over some deadline, remember that some people get paid to risk their lives -- or save the lives of others -- every single day.

From creativity to networking to tech-savviness, the modern-day job hunt requires a little more than it once did. What can you try when looking to make your next career move?

Sex, violence and over-the-top action -- it's easy to see the influence that exploitation movies have had on cinema as a whole. You can even split the genre into a number of subgenres that push the boundaries of taste and decorum with every frame. Here are 10 of the most noteworthy.

During an economic downturn such as the one we're in now, people look for businesses that are likely to weather the storm. But is any business truly recession-proof?

For as long as we've complained about gas prices, there's been an army of inventors offering devices to stretch our mileage further. But which ones work and which are hoaxes?

At some point, you'll likely want to stop working. You'll also have to figure out how to pay the bills once you retire. Here are 10 tips to help you out.

Ever wonder where the rich and famous live in the United States? Wonder no more. While there are hundreds of possibilities, we'll narrow it down to the top 10, including the havens for longtime bearers of wealth and the up-and-comers of the country's elite.

The road trip is an American tradition, and some drives are simply more beautiful than others. If you're looking to tour the country by car, which scenic routes should you take?

The drive for energy-efficient building comes down to a quest for the so-called tight envelope, which you can often achieve using renewable, recycled material. What are some of the latest energy-efficient building materials?

In cities across the United States, entrepreneurs in carts and trailers are offering some of the most original, authentic and creative dishes in town.

The sleek lines, powerful engines and machine strength of muscle cars have attracted us since the late 1960s, when performance and design filtered down into the realm of the attainable. So what are the most wanted classic muscle cars today?

Can you keep up with the flock? Do you remember which direction they were going? Exercise your brain and improve your attention span with Lost in Migration. Don’t get left behind, play Lost in Migration today!

Sudoku is the hottest game in America, and we have free online sudoku for you here every day.

Use your keen eye to pick the right locations to build parks and shops. Pick your paint colors, upgrades and landscaping to create the ultimate curb appeal and earn outstanding profits with Build-a-lot 2: Town of the Year!

Chuzzles are googly-eyed little balls of fur that giggle, squeak and sneeze as you poke and push them across the board. Free them by forming groups of three, but watch out for dangerous puzzle locks! Explore four different game modes as you earn trophies, unlock secret games and more! Once you start popping Chuzzles you might not be able to stop!

Show your hold'em skills in the all-new Governor of Poker 2, a masterful poker adventure set in the Wild West!

Take the king's challenge in Royal Envoy™, and think your way to triumph in this whimsical resource management experience.

Super Collapse! Puzzle Gallery is a puzzle party! Are you a puzzle genius? It isn't as easy as it looks!

Solitaire isn't just a solo game anymore! Play the largest selection of Solitaire games on Facebook - Klondike, Pyramid, Spider, Crescent and Freecell! Challenge your friends, collect game boosts and more.

Guide the tribe to construct useful buildings, collect needed resources and decorate the landscape. They will then reward you with tributes and helpful items to make it through. Introduce new technologies, play fun Hidden Object mini-games and earn fantastic rewards in Jack of all Tribes!

Search through over 30 cryptic locations including the sinister mansion and a bloody sacrifice room for important artifacts. Find items quickly to score bonus points that help unlock four useful search powers and two bonus play modes. Will you uncover the town's many hidden secrets and save Audrey's husband?

Enjoy a round of table hockey anytime you want with this exciting online version of the popular arcade game!

Use magic spells to save your loved one from goblins in Hidden Magic, a fantastic adventure that blends Hidden Object game play with fun magical battles.

Leave the big city behind for good in Farm Mania 2, the fantastic follow-up to the hit farming game!

Get into the festive spirit of Halloween, Thanksgiving and Christmas as you build up underwater fish kingdoms filled with holiday cheer tackling Fishdom - Seasons Under the Sea™ - 3 in 1!

Have you got what it takes to skipper a crab boat on the Bering Sea? Take charge of your own vessel and see if you can survive a season of derby style king crab fishing.

Jane is back again! She has restored her family hotel network and opened a boutique, and now she is ready to start leasing houses! Help her build a whole city, complete with electric power stations and water towers, houses for rent, stores, restaurants and even a city hall!

Return to the skies and visit incredible destinations in this amazing sequel, where you guide colorful planes through landings, take-offs and everything in-between. Take on the challenge of all-new, creative levels in some of the most astounding places, including the North Pole, Monsterville, Tiki Taka Island and even the moon!

Discover a rich world filled with incredible fun in Ancient Secrets, a bold new adventure for all ages.

This is the ultimate game for Solitaire lovers –- and it’s free! Does it get any better than that? We tend to think not. Play Klondike Solitaire today and see what you’re missing!

The challenge in Mahjongg online is finding all the matching tiles while working your way through the pile. Can you take on the challenge of the tiles?