From Bill Clinton to Oprah, life coach and author Tony Robbins has coached some of the most powerful and famous people in the world.

His five best-selling books and popular self-help seminars have made him rich. WealthX estimates that he's worth at least $440 million.

Robbins owns a resort in Fiji, travels by private jet, and is an owner of Los Angeles' Major League Soccer team. He's made the most of his success.

Born in downtown Los Angeles in 1960, Tony Robbins comes from humble beginnings. His stepfather, a former minor league baseball player who was working as a salesman, struggled to get by, and the family often couldn't afford to celebrate Thanksgiving and Christmas.

Source: Business Insider

At a young age, Robbins decided that he wanted to be rich when he grew up, so that he could help people in need. He succeeded: By 24, he'd become a millionaire thanks to his five best-selling books on personal growth.

Source: GoBankingRates

Robbins has coached some of the world's most high-profile people, including Oprah Winfrey, Andre Agassi, Bill Clinton, Paul Tudor Jones, Serena Williams, Leonardo DiCaprio, Nelson Mandela, Princess Diana, and Mother Teresa.

Source: Business Insider, TonyRobbins.com

Jeff Gundlach doesn't think there's a good chance we'll see the Fed hikes rates this year.

In his latest presentation on the economy and the markets, the so-called "Bond King" talked about the high-yield market, the Fed, and the potential the nominal GDP could be set to turn higher. 

Gundlach said that there will not be a collapse in the high-yield bond market this year because there just aren't the many maturities, or bonds that need to have their principal returned to investors. 

He also quoted Hemingway when discussing bankruptcy ("Gradually, then suddenly."), and thinks any growth in wages is the most important thing to consider when looking at a potential rate hike from the Fed.  

Thumb through each of these slides and examine every chart closely if you want to understand how Gundlach thinks.

Thanks to DoubleLine Funds for letting us feature this presentation.

Britain's richest man isn't even British — it's Ukraine-born billionaire Len Blavatnik.

Blavatnik is worth $20.1 billion, rising to prominence after his privately held industrial group, Access Industries, purchased Warner Music Group for $3.3 billion in 2011. 

Since investing in tech giants Spotify and Beats, his wealth has ballooned, propelling him to the top spot from the number four spot on the Sunday Times Rich List just last year. 

From hanging out with famous musicians to partying on his yacht, get to know Britain's richest man.

Blavatnik attended Moscow University of Railway Engineering until his family immigrated to the US in 1978.

He went on to earn his masters degree in computer science at Columbia University and his MBA at Harvard Business School. He remained loyal to his alma mater: In 2013, he donated $50 million to Harvard to sponsor life sciences entrepreneurship.

In 1986, Blavatnik founded Access Industries, a privately held industrial company. Initially, AI was involved in Russian investments but has since diversified its portfolio.

We live in a post-Snowden world. For many, that means assuming none of your digital assets are safe from surveillance.

There are ways, however, to use the internet and insane mathematics in your favor to ensure that no one can see whatever it is that you're sending to someone else.

It's called PGP, which stands for "pretty good encryption," and it's a way to encrypt your messages. Encryption, at its most basic form, is a way to cypher a message so that if anyone that sees the data in transit they have no way to know what the message says. OpenPGP is the most popular standard for digital encryption.

In fact, Edward Snowden first contacted journalist Laura Poitras to inform her of his trove of documents using PGP.

So let's take a look at what PGP is and how easy it is to use.

SEE ALSO: Reddit is about to become a lot more secure

So what is encryption?

Encryption is basically a way of jumbling digital data so that no one can see what it really says while it's being sent. For the purposes of this explainer, we're going to focus on what's called "public key encryption" for email. This uses a multitude of cryptographic techniques to cipher every message using two factors that are constant to every person using PGP: a public key and a private key.

A public key is the information that is needed to encrypt a message. People wishing to receive encrypted messages make their public key readily available, as it's the only way for sources to begin the process of sending secure messages.

Encryption can change a plaintext message from this....

To this jumbled mess...

See? No one will know what the heck you're sending!

Hollywood's recycling bin is filling up -- especially for movies being adapted to TV.

In the upcoming season alone, there's numerous TV shows based on movies, including ABC's "Uncle Buck," CBS's "Limitless" and "Rush Hour," Netflix's "Wet Hot American Summer," MTV's "Scream," and Fox's "Minority Report."

In the crowded TV landscape, networks are looking for anything that can break through. Projects which existed in another medium (book, movie, stage play), and better still if they were hits, mean viewers already have knowledge of the show and possibly a connection.

Here are 19 movies currently being developed for TV.

"The Mortal Instruments"

Titled "Shadowhunters," the series is based on Cassandra Clare's "Mortal Instruments" book series. Set at ABC Family, the series has cast "Vampire Academy" actor Dominic Sherwood in the lead role of Jace.

"The Omen"

A&E's follow-up to 1976's "The Omen" finds Damien Thorne all grown up. With very little knowledge of the ungodly forces around him, he'll have to face the truth that he is the antichrist.

"American Gigolo"

Jerry Bruckheimer ("CSI" franchise) is developing the TV adaptation with Paramount TV. In the 1980 film, Richard Gere plays a male escort who's accused of murder.

Snapchat just launched a new website designed to convince advertisers to purchase ads for the app.

In an introductory video, CEO Evan Spiegel explains why he thinks Snapchat ads are better than the competition. Snapchat is reportedly generating hundreds of thousands per day from its video sponsorships.

Snapchat ads don't include what's called a pre-roll video — ads that run before your content starts playing — which Spiegel thinks people find "annoying." All Snapchat ads are also arranged vertically so they fill the entire screen on smartphones, which is a big theme on Snapchat.

Spiegel also lays out the two forms of Snapchat advertising: premium and curated content. Premium content is essentially high-quality ads provided by Snapchat's "editorial partners," while curated content pulls in live stories collected from Snapchatters at events around the world.

You can see Snapchat's entire pitch to advertisers below.

SEE ALSO: Snapchat, WPP, and The Daily Mail have just launched an ad agency

Snapchat emphasizes it is THE place to reach millennials.

...and how a majority of millennials in the U.S. are on Snapchat.

Snapchat users are watching a lot of video.

John B. Spark's Histomap, originally published by Rand McNally in 1931 and preserved today by the David Rumsey Historical Map Collection, is a five-foot long map documenting the history of seven different civilizations.

The map illustrates what Sparks believed were crucial historical events of the Aegean, Egyptian, Hittites, Amorites, Iranians, Indians, Huns, and Chinese civilizations from 2000 B.C. through 1900 A.D. 

It originally sold for only $1 and stands today as a fascinating example of one man's goal to record thousands of years of history.

SEE ALSO: This map shows the best tourist attraction in every state

FOLLOW US!  Business Insider Travel is on Twitter

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NOW WATCH: This animated map shows how humans migrated across the globe

Not everyone gains entrance into the meeting places of the world's most powerful leaders.

In the interest of safety, meetings that take place in these eight rooms — located in tightly secured buildings, sometimes within huge secured complexes — are closed-door affairs.

It's that secrecy that fascinated photographer Luca Zanier, who was granted access to rooms in the buildings of the UN, FIFA, the Council of Europe, and other international government agencies — while they were completely empty. 

It's in these rooms where world-changing decisions are made by just a few individuals. These decisions "determine a large part of our collective existence," Zanier says, which is exactly what he set out to convey in his photo series, "Corridors of Power." He also created a photo book for the project, which recently reached its crowdfunding goal. 

Check out the rooms in all their quiet glory below. 

The United Nations General Assembly in the UN Headquarters in New York City is possibly the most powerful room that Zanier photographed. Here, representatives from 192 state delegations vote on essential UN regulations and functions.

The UN Trusteeship Council hasn't met in this room since 1994, after its goal of guiding post-WWII "trust territories" was achieved. However, they're still a part of the UN charter and remain an organization on paper.

UN Room XXIV is a 260-person capacity conference room in the UN's Geneva office. Though it lacks the glitz of the New York headquarters, it's certain that some important meetings are held here.

Cancel your gym membership and throw out those old Tae Bo tapes — getting in shape is now as simple as turning on your computer.

It's super easy to hack your fitness routine using YouTube. Channels devoted to everything from yoga and pilates to weight-lifting and parkour will have you looking and feeling better in no time. 

Plus, it's a totally free way to build a new exercise plan or spice up your current routine. 

Here's a look at 15 YouTube fitness stars who will have you off your couch and sweating in no time.

SEE ALSO: How to eat a fast-food breakfast without completely wrecking your diet

Cassey Ho wants you to "train like a beast" to "look like a beauty."

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Combining pilates moves with sculpting workouts, the "Blogilates" channel is wildly popular on YouTube.

Starring certified fitness instructor Cassey Ho, the videos feature popular music to help keep your energy level high during her high-intensity workouts. 

Her "5 Minute" video series is great for fitness in a hurry. Each video involves doing one minute of five individual moves targeted to work a specific area, such as legs, arms, or abs. 

YouTube subscribers: 2,346,042

Try Ho's "Intense INNER THIGH Challenge" to tone up your legs. 

Train with "Official Barstarzz" to impress your friends with some intense new moves.

If you're getting bored with your regular fitness routine mix things up with some of the exciting videos from "Official Barstarzz."

This international fitness team proves that you can get ripped just about anywhere, from your driveway to your office floor. 

"You don't need expensive equipment or gym memberships at all. Anything we do can be done if not at your home, then your local park. This is real strength, functional fitness,"explains the team's Facebook page. 

YouTube subscribers: 513,977

Learn how to do an impressive "back clap push up"here. 

Elliot Hulse can help you make some serious gains.

Strongman Elliot Hulse is focused on helping you "become the strongest version of yourself," with his YouTube channel, "Strength Camp."

Don't be intimidated: Hulse breaks his workouts down clearly, like this video which teaches his top four exercises for getting stronger.  

"Strength Camp" videos do require some equipment, so you'll have to make sure you have the right weights and supplies for your body. 

YouTube subscribers: 1,356,454

Learn how to properly execute a dead-lift with this video. 

There are many great personal finance books out there, but if you can't make the time to read, another option is listening to podcasts.

We compiled a list of informative, free podcasts that will answer all of your money-related questions, and help you understand the nuts and bolts of investing, saving, and spending.

Try tuning into one of these on your next commute if you're ready to start successfully managing your money.

SEE ALSO: 8 Resources That Will Make You Smarter About Investing

1. We Study Billionaires: The Investors Podcast

Hosts Preston Pysh and Stig Brodersen take a look into the lives of billionaires — including Richard Branson, Warren Buffett, and Mark Cuban — and study the books they read.

After determining the critical habits of the most financially successful individuals, they reveal their findings and insights on their show, "We Study Billionaires: The Investors Podcast." 

Don't miss:Episode 40: Richard Branson — Screw It, Let's Do It, where Pysh and Brodersen delve into the key concepts of the billionaire's book, "Screw It, Let's Do It," and discuss Branson's business mindset and his best advice.

Listen to We Study Billionaires here.

2. Listen Money Matters

This lively show, hosted by personal finance expert, Andrew Fiebert, and small business owner Thomas Frank, will keep you alert and laughing. The hosts offer actionable personal finance advice, and deliver it in a very raw and honest tone.

Don't miss: The 03/25/15 Episode: Being a Successful Penny Stock Trader, where Fiebert and Frank sit down with a trader who turned $12,000 into $4.2 million by trading penny stock.

Listen to Listen Money Matters here.  

3. Money Girl's Quick and Dirty Tips for a Richer Life

Author and personal finance expert Laura Adams keeps things brief and to the point in her under-10-minute podcasts. Despite their brevity, they're packed with digestible tips that will answer all of your burning money questions. Recent episodes include: "When you should avoid using a debit card,""Decisions Millennials must make to grow rich," and "5 FAQs about Roth retirement accounts."

Don't miss: Episode 403: 6 Risky Situations When You Should Avoid Using a Debit Card, where Adams explains when a credit card should always be used over a debit card, as well as your liability rights for debit and credit cards.

Listen to Money Girl here.   

Hidden bars have been popular in New York since Prohibition.

Today, drinking is legal, but New Yorkers still love these speakeasies for their vintage decor, secret entrances, and cocktails made with classic ingredients.

From Dutch Kills in Long Island City to Attaboy on the Lower East Side, here are 35 hidden bars in New York City.

An earlier version of this post was written by Megan Willet.

Raines Law Room's waiters come to your table when you pull a lamp string.

48 W. 17th St., Flatiron

On West 17th Street you’ll see an unmarked stairwell.

Head down and ring the doorbell, where a host will take you into the underground cozy den filled with curtained-off couches, soft music from the 1920s, and lamp strings you pull to have your waiter approach your table and take your order.  

Bar Centrale is hidden inside a brownstone apartment.

324 W. 46th St., Hell's Kitchen

You might walk right past Bar Centrale, considering that it looks like any other brownstone apartment on the outside. Inside, however, is a cool bar.  

If you want a table, you'll need to make a reservation, but try to pop in after Broadway shows as the bar sometimes plays host to Broadway stars.

At 67 Orange St., you can get lobster mac and cheese with your cocktail.

2082 Frederick Douglas Blvd., Harlem

Behind the thick curtains lining the windows of 67 Orange St. is an intimate Harlem speakeasy where you can get crafty cocktails with everything from gin and cognac to whiskey and champagne. 

The lobster mac and cheese and fried-chicken sliders complement the tasty drinks.

June 21st — the summer solstice and the longest day of the year — marks the official start of summer.

In Norway, people usher in summer with a massive celebration called Slinningsbålet.

It's celebrated with a huge bonfire every year on June 24th in the town of Alesund, which sits on the west coast of the country.

Slinningsbålet is part of the midsummer — or sankthans — celebrations, which honor the birth of John the Baptist.

Since this time of year marks when the sun starts to retreat, the midsummer fires — which date back multiple centuries — are believed to reflect the sinking flame of the sun.

To celebrate, the town builds a bonfire. But this isn't just your average bonfire. It takes 30 to 40 people several days to build a huge tower of wooden crates that's eventually set on fire, creating a massive roaring fire.

In 2010, the tower was a record-setting 132.71 feet tall. This year, the tower will be 112-feet-high.

The flaming tower is built on a small piece of land that is surrounded by the ocean so when it topples, it falls into the water and doesn't present any hazards. 

Here's a video that shows the building, lighting, and burning of the tower from 2010.

 The tower was not nearly as high last year (only 131.2 feet). Here are some photos of it that were taken by a drone.

And if you're wondering how exactly they light this huge tower on fire, here's your answer: Someone lights what appears to be a fuse housed in a barrel placed at the very top of the tower, and then climbs down as it start to burn. In the photo below you can see one of the climbers lighting the fuse.

And here they are climbing down the tower as it starts to burn.

One of them actually climbs back up to place the burning fuse back into the barrel.

The climbers quickly and safely make their way down before this happens.

SEE ALSO: The Hobbiton Movie Set is one of the biggest tourist attractions in New Zealand

Join the conversation about this story »

NOW WATCH: This is the best route to take for an epic road trip across the US

Quiz time: Can you name Newton's first law of motion?

No? (Don't feel bad, I had to look it up, too.)

Newton declared, "Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it."

In other words, if you are flying in the International Space Station and toss an apple out the window (come on, use your imagination), it will keep going in that same direction forever, unless something stops it (like a planet, gravity or alien life form).

Although Newton was talking about physics, little did he know he was also describing life.

People tend to move in the same direction as they always have unless some external force is applied. I don't know about you, but I don't want my life to be lived in a straight line. I want to change, to improve, to crush it.

Related: 50 Books That Transformed My Business and My Life

This is why I read. 

A book is a powerful external force that can completely knock your life off its mundane straight line and change everything about who you are. The following are five books that did just that in my life.

"Rich Dad, Poor Dad"

Something was eating me alive inside. (No, it wasn't a parasite.) It was an idea. 

Something about work, life, money, wealth and freedom — but I couldn't quite say what that idea was. For months it weighed on me, but I couldn't find words to express it.

Then came "Rich Dad, Poor Dad" by Robert Kiyosaki.

Finally, there were words for the internal dialogue that was taking place every minute of my life. I could finally form my abstract thoughts about money into actual speech — and it changed my life forever.

It's hard to say exactly what "Rich Dad, Poor Dad" is because it means so many different things to so many different people. But the gist of it is this: The poor work for their money, but the rich make their money work for them.

It's a mindset book more than anything, but with enough stories and examples to keep you captivated. It's no wonder this book is hands down the most popular book recommended by guests on The BiggerPockets Podcast that I co-host each week.

Kiyosaki taught me to stop saying, "It can't be done," and start asking, "How can it be done?" in every area of life. He started me on a journey that led me to buy my first rental property, followed by dozens of other investment properties that got me out of the "rat race" by the time I was 27.

For the first time, I began to see that wealth is not an accident, but an action. (Yes, I expect you to tweet that! I worked hard on that line!)

Do yourself a favor and pick up a copy of "Rich Dad, Poor Dad" this week.

"The Total Money Makeover"

A year after reading "Rich Dad, Poor Dad," a friend from church recommended I read through Dave Ramsey's book "The Total Money Makeover," and once again, my life took a turn for the better after a rude awakening: my spending was out of control!

I was spending $1,000 a month more than I was making. How did I not realize this?

"The Total Money Makeover" helped me to look at my personal finances with more seriousness and gave me a passion to pay off debt, live more frugally, and save more money.

Suddenly, having a budget didn't seem like a chore, it felt like I finally had a reign on my wallet. I was in control of my spending. My spending was not in control of me.

As an entrepreneur, some months are financially better than others. However, because of the lessons I learned from "The Total Money Makeover," I'm better prepared to handle the difficult times because I have a strong personal finance foundation.

"The 4-Hour Workweek"

No, I don't work four hours a week. No, I don't travel to exotic countries to salsa dance. I don't even know what Chinese kickboxing is.

But Tim Ferriss' story and philosophy about business and life resonated with me in a powerful way that altered my life, my relationships, my free time and my purpose.

Whereas "Rich Dad, Poor Dad" taught me that wealth was mine for the taking, "The 4-Hour Workweek" taught me that life was mine for the taking. 

I don't need to wait until I'm 62 to enjoy the fruits of my labor. I don't need to have $1,000,000 in the bank to achieve the life that millionaires brag about. I don't need to slave away at a job I hate just to pay the bills.

There is another way.

Part productivity handbook, part inspirational and part lesson in entrepreneurship, "The 4-Hour Workweek" refuses to be classified as anything but what it truly is: life-changing.

Related: 10 Great Autobiographies From the Brightest Minds in Business

I think critics of "The 4-Hour Workweek" tend to focus too much on the specifics of the book. "I can't do that in my job" or "I don't want to travel the world like Ferriss." They are missing the point and can't see the forest for the trees.

You don't need to hire a virtual assistant for $2 an hour to change your life (though, I did). You don't need to start an online business that generates passive income (though, I did). You don't even need to backpack Europe like a hippy (though, I did). However, there are ways you can improve your business and life through efficiency and optimization.

For example, I hate talking on the phone with tenants, so after reading "The 4-Hour Workweek," I hired someone part time to answer phones for me and show vacant units. The cost to me is tiny compared the amount of mental space it cleared up in my life, time that I could spend doing business activities I actually enjoy doing.

To sum up "The 4-Hour Workweek": Find things in life that make you passionate, pursue them with all your soul, and enjoy a glass of red wine while you are at it.

GQ magazine just released its list of the 20 most stylish men alive, and not only did the publication exclude George Clooney — it rubbed it in his debonair face. 

In a post about how the list was determined, GQ contributor Will Welch included a note about Clooney's absence. He wrote:

FWIW: George Clooney may be an icon of manliness to those of us who were born before 1985, but nobody under the age of 30 seems to think of him as particularly stylish.

Talk about shots fired! Let's unpack this. 

Seeing as GQ's list was based largely on what famous men wear in their off time, I agree, Clooney's off-carpet style leaves something to be desired. He has an unfortunate collection of dad jeans. 

I'll also admit that Clooney is kind of a one-tux-pony. (That is to say, he's most often photographed in formal wear.) But to claim that "nobody under the age of 30" thinks he has style is a blasphemous generalization.

Clooney has set the bar for black-tie on the red carpet.

He represents old Hollywood glamour and gives the young guys on the carpet — like Ryan Gosling and Bradley Cooper, both on GQ's list — something to aspire to. Leaving him off the list is one thing, but denying his influence is quite another.  

To be known for one type of look is not a sign of irrelevance, but a badge of true personal style. And if said singular style is Cary Grant meets off-duty superhero, you're doing something very right.

Here are 15 photographs that prove Clooney's ability to look "particularly stylish"— even to the eyes of a twenty-something — as well as some trademark Clooney moves that I picked up in my photo research. 

Clooney has a long history of making fashionable arrivals at the Venice Film Festival.

He also has a long history of wearing designer polos — as you can just barely see in this photo — under his sport coat. Here he's rolling up to the 2005 Venice Film Festival. 

Clooney and Academy Awards best-dressed lists are pretty much synonymous.

I'd like to point out that this photo was taken in the mid-aughts — a tricky time for men's fashion — and Clooney's tux is perfectly timeless. I could say this image is from 2015 and no one would question it. 

He always steps it up when he's being photographed next to Brad Pitt.

I noticed this as I was combing through various photo wires. Clooney's best non-formal-wear moments have been captured during press events and red carpets for his movies with Pitt. Note the polo/coat combo.  

Michael Seibel, cofounder of Socialcam and Justin.tv and a partner at Silicon Valley startup incubator Y Combinator, needed to furnish his new apartment in San Francisco. 

He asked his Facebook friends for recommendations. Multiple people suggested trying Homepolish, an interior design startup that's becoming increasingly popular in the tech community. 

Seibel and his girlfriend worked with Homepolish designer Jason Wong to get his dream apartment. 

"I wanted a simple one-bedroom apartment that would impress people when they walked in, but that was otherwise extremely comfortable and useful," Seibel told Business Insider. "I really like showing off the place." 

Seibel is a successful founder and investor. Prior to joining Y Combinator, Seibel founded a video app, Socialcam, which had just 4 employees when it was acquired for $60 million.

The one-bedroom loft has an industrial feel. It's located in the South Beach neighborhood of San Francisco.

Wong wanted to help Seibel make the apartment feel more inviting. "We tempered the architecture finishes of the loft with softer furnishings and materials," he told Business Insider. "We blended their love of reclaimed wood and metal with shag rugs, quilted chairs, leather, and velvet."

A giant mirror makes the first room feel a bit more spacious.

In the midst of a six-year recession, Greece's public is reeling from the effects of unemployment rates that are more than double the eurozone average.

Just this week, the International Monetary Fund announced that if the country fails to make the $1.8 billion debt payment that's due in less than two weeks, there would be no grace period. 

Greece's street artists have been voicing their grievances all over the public walls of the cities, publicizing their impressions of the IMF and Greece's current government. From simple tags, to more extravagant statements - take a look at these street artists' take on Greece's current state of affairs.

(Captions by Sarah Jacobs and Reuters) 

Violent demonstrations broke out in Athens in 2010 due to austerity measures. Here, riot police are on the scene. Behind them, a message on a bank wall informs the International Monetary Fund to get out.

Police stand guard outside a hotel in Athens while protesters rally in response to a Greek pensioner's recent suicide due to the economy.

Greece's new left-wing government announced this February that they will not take actions that would hurt the share values of the country's banks and does not plan to appoint party officials at key management posts.

Everyone is waiting for Greece and Europe's leaders to agree on a bailout deal.

It seems as if every morning brings another incremental development or regression in Greece's battle against its European creditors.

So in the meantime, we've put together a guide to what's been happening in the underbelly of Greece's economy.

Everything from demographics to corruption to cigarettes — check it out.

Greece has a history of financial troubles — the country's first default occurred way back in the fourth century B.C.

Back in the fourth century B.C., 13 Greek city-states borrowed from the Temple of Delos. Most of the borrowers, however, "never made good on the loans and the temple took an 80% loss on its principal."

As a reference point, Plato, Aristotle, and Alexander the Great were alive during the fourth century.

Source: Investopedia

In the modern era, Greece has defaulted a grand total of five times — which is only half as many times as the default leaders, Venezuela and Ecuador, have.

Greece defaulted on its external-sovereign-debt obligations five times:

• 1826— It happened during the Greek War of Independence from the Ottoman Empire.
• 1843— Greece used funds from the Loan of 1832 on its military and "the upkeep of Otto, a Bavarian prince." The country stopped making payments in 1843.
• 1860— After this default, Greece was kicked out of international markets until 1878.
• 1894— When the markets opened, lenders were overeager, borrowing increased to unsustainable levels, and the government suspended payments in 1893.
• 1932— This happened during the Great Depression.

Source: Investopedia

Greece has spent a combined 90 years — almost half of the time since its independence — in financial crisis.

Greece finally gained independence from the Ottoman Empire in 1830 after Great Britain, France, and Russia intervened to help out in the War of Greek Independence. (Fun fact: even poet Lord Byron joined in to support Greece.)

The country has spent 90 out of 196 years since then in financial crisis.

Source: Business Insider via Bank of America

Polar bear plunges have become a tradition, with brave swimmers diving into ice cold waters one day of the year to prepare for the winter. 

But in Australia, the Bondi Icebergs Winter Swimming Club has been doing this since 1929 — and not just for one day, but every winter Sunday morning from May to September.

The Olympic-sized Bondi Icebergs public pool sits right next to the Tasman Sea in Bondi Beach, a suburb of Sydney.

The pool temperature hovers around 16 degrees Celsius (60 degrees Fahrenheit), which isn't freezing. However, when thunder clouds come in, the sea swells and brings in massive waves that crash into the nearby pool, making it very challenging to swim.

Despite this, the Icebergs have been embracing their membership traditions for over 80 years.

Click here to see the photos »

Massive swells from the Tasman Sea crash into the Bondi Icebergs pool.

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Check out the waves in action.

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Despite this, members brave the swell and hit the pool.

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The most successful people know that exercise is the key to mentally and physically pushing themselves further, though some are more willing to keep up the habit than others.

Numerous studies have found exercise to be one of the most important habits you can develop to transform your life. Working out can make you healthier, happier, and better able to sleep; it can boost your memory, concentration, and mental sharpness; and you don't need to spend a lot of time doing it to reap the benefits.

From tennis to surfing to basketball, here are the exercise habits of 15 successful people.

Vivian Giang contributed to an earlier version of this article.

President Barack Obama sweats it out 45 minutes a day, six days a week.

Exercise has helped the president become the man he is today. Obama admitted in his autobiography "Dreams From My Father," to being a casual drug user and underachiever until he started running three miles a day.

Today, he continues to stick to his workout routine, which is a combination of strength and cardio. In an interview with Men's Health, Obama said he works out for 45 minutes, six days a week. He'll even wake up early to work out despite not being a morning person.

He's also known to play basketball on courts in federal buildings around Washington.

Richard Branson gets four additional hours of productivity every day by working out.

When author Tim Ferriss asked the mogul how he stays productive, Branson answered "work out," as recorded in Ferriss' 2010 book "The 4-Hour Body."

Branson said his physical activities, which can include swimming, Bikram Yoga, rock climbing, running, and weightlifting, give him at least four additional hours of productivity each day.

Warren Buffett chooses exercise over diet.

The billionaire loves his hamburgers, hot dogs, and Coca-Cola.

To avoid a change in diet as suggested to him by doctors, he chose to exercise instead, the "lesser of the two evils,"he told CNBC.

There used to be a time when a $1 billion valuation was considered a massive success for tech startups.

Then that threshold rose to $5 billion, and then $10 billion.

Looking at recent media reports and The Wall Street Journal's "The Billion-Dollar Startup Club" list, there are now over 100 "unicorn companies"— companies with $1 billion+ valuations. There's a growing number of "decacorn" companies, or startups with $10 billion valuations.

Now, there's a group of startups worth $20 billion or more. Here are the relatively new, private tech companies that are worth tens of billions of dollars — or that will be very soon.

No. 5: Snapchat

Valuation: $16-20 billion

CEO: Evan Spiegel

Founded: 2012

What it does: Its photo-messaging app allows users to send photos and videos that automatically disappear after a set period of time. 

Total funding: $1.2 billion

Notable investors: Yahoo, Kleiner Perkins, Benchmark Capital, Lightspeed Venture Partners, Coatue Management, SV Angel

No. 4: Palantir

Valuation: $15 billion, but $500 million in new funding could bump up its valuation to $20 billion

CEO: Alexander Karp

Founded: 2004

What it does: Palantir is a software and services company that specializes in data analysis. Some of its biggest clients are government agencies like the CIA and the FBI.

Total funding: ~$1.5 billion 

Notable investors: Founders Fund, Tiger Global Management, Glynn Capital Management, Jeremy Stoppelman

No. 3: Airbnb

Valuation: $24 billion

CEO: Brian Chesky

Founded: 2008

What it does: Through its app and website, Airbnb provides a marketplace for people to rent out rooms or their entire homes to other people. 

Total funding: ~$1.8 billion, pending a fresh $1 billion round of funding

Notable investors: SherpaCapital, T. Rowe Price, Founders Fund, CrunchFund, Sequoia Capital, Andreessen Horowitz, DST Global, General Catalyst Partners, SV Angel, Greylock Partners