You could call them the most eligible bachelorettes in the world.

Five of the wealthiest women on earth are still unmarried, according to Wealth-X, a company that conducts research on the super-wealthy. With Valentine's Day in mind, it provided us with a list of the richest bachelorettes in five age groups: 20s, 30s, 40s, 50s, and 60s. Combined, they're worth $46 billion.

Meet five of the wealthiest in the world below, including owners of a biotech startup and a luxury-clothing business.

SEE ALSO: Out of the 50 richest people in the world, only 4 are women — here's why

DON'T MISS: 7 extremely wealthy people who choose to live frugally

20s: India Rose James

Age: 24

Net worth: $280 million

Country: UK

India Rose James inherited an estimated 40% of her maternal grandfather Paul Raymond's $1 billion empire upon his death in 2008. His wealth — known as the Soho Estates—came from varied property investments in London's Soho district, establishing Britain's first adult-entertainment bar, and introducing pornography magazines to the country through Paul Raymond Publications.

James is currently focused on Soho Revue Gallery, the young artist-focused contemporary-art gallery she opened last spring with her then boyfriend Will Pelham. The socialite has breakfast at the family-owned Soho House every morning, enjoys traveling, and aspires to follow in her grandfather's footsteps to become "an entertainer."

30s: Elizabeth Holmes

Age: 32

Net worth: $4.5 billion

Country: US

Elizabeth Holmes is the youngest female billionaire in the world thanks to the success of her pain- and needle-free blood-testing company Theranos. When she was 19, Holmes dropped out of Stanford to found the company and has dedicated her life to it. According to a 2014 New Yorker profile, the CEO lives in a "two-bedroom condo in Palo Alto...no longer devotes time to novels or friends, doesn't date, doesn't own a television, and hasn't taken a vacation in ten years."

Though Holmes' image is that of a well-intentioned hard worker, she's facing harsh criticism for reports claiming dodgy business practices. "This is what happens when you work to change things," Holmes fired back. "First they think you're crazy, then they fight you, then you change the world."

40s: Filiz Sahenk

Age: 49

Net worth: $2.4 billion

Country: Turkey

Turkish billionaire Filiz Sahenk helms the luxury-brand clothing and tourism businesses of her late father's private conglomerate, Dogus Grubu. Sahenk oversees the company's retail partnerships with several global brands, including Emporio Armani, Gucci, and Loro Piana.

Despite being one of the most affluent women in Turkey, Sahenk isn't a public fixture. She's a behind-the-scenes advocate for women's leadership and development and an active philanthropist as president of the Ayhan Sahenk Foundation, which supports education, the environment, and social and healthcare-related causes. She also reportedly has a passion for collecting antique Turkish art.

San Francisco and the surrounding Bay Area are some of the most expensive housing markets in America. 

House prices fell 1.8% since March of last year, the first drop of its kind in four years, but the housing in the Bay Area still carries a hefty price tag.

Using data provided to us from Zillow, the largest real estate network on the web, we've narrowed in on San Francisco's 20 most expensive homes for sale.

Scroll down to see the most expensive listings for yourself, ordered lowest to highest:

SEE ALSO: Home prices in San Francisco just fell for the first time in 4 years

20. 1 Upper Road, Ross, California

Price:  $15,995,000

This estate has 2 guests houses, a tennis court, pool, pool house, and a seven car garage. With a high priority placed on privacy, the property is spread across 3.05 acres and includes numerous beautiful gardens. 

See the listing for photos and information.

19. 155 Kings Mountain Road, Woodside, California

Price:  $16,795,000

Between the main residence and the guest house, this estate spans 5 acres and includes gardens, a pool, spa, tennis court and playground, not to mention an equestrian facility that can house up to eight horses. There's even a poolside outdoor kitchen.  

See the listing for photos and information.

18. 5 Faxon Forest, Atherton, California

Price: $16,900,000

This English-style estate, designed and constructed in 2007, sits on just over an acre of land. The entertainment lounge, found on the first floor, includes a home theater with custom seating, a billiards area and a bar as well as a wine room. Best of all? The Master suite has a private balcony and fireplace. 

See the listing for photos and information.

For travelers with the gleam of the Big Apple in their eye, nothing seems better than New York City in the summertime.

Restaurants have outdoor seating, there are festivals all over town, and you don't have to worry about bringing your jacket to Top of the Rock.

But long-time city dwellers know the horror behind the mystique: those awful smells that dominate every daily commute to and from the office.

Here's why it's hard to escape the stench of the city in the heat of summer.

New York City has the highest population density in the US, and with 8,550,405 people roaming the nation’s melting pot, it’s bound to get smelly.

A census conducted in July 2015 showed that the city had a population density of over 27,000 people per square mile. To put that into perspective, the US, on average, holds only 80 people per square mile. That much combined body odor alone could be enough to scare anyone away.

With such an insanely huge number of people living in just one city, it should come as no surprise that there is also an insanely huge amount of garbage produced.

Although residents of the city produce 12,000 tons of waste every day, New York City doesn’t have any of its own landfills or incinerators. Garbage piles up in dumpsters until it can all be taken across the Hudson River to be incinerated in New Jersey, or, if possible, recycled locally and overseas.

But even after most of this waste has been incinerated across the river, strong winds can still carry the stench back over to the city on a hot day.

The sheer amount of garbage isn’t the only problem. There also has to be a way to get all of it out of the city. Diesel trucks carry garbage out of Manhattan 7.8 million times each year. Let this sink in: That’s the same as driving around the earth 312 times, and that's just for one city.

All this driving only adds to pollution and the greenhouse effect, causing the city to become warmer and smellier as time continues.

You may also be wondering why those subway vents on every block smell so much more putrid on a steamy summer day. Or how it is possible to smell a food cart from all the way down the street.

It turns out the combination of heat and humidity allow bacteria to grow faster and smells to travel further. Increasing temps mean molecules move faster, resulting in enzymes speeding up metabolism and cells quickly increasing in size. Heat is bacteria’s best friend.

So when you get stuck with one those incredibly humid days, smells become only more potent. The water in the air causes these odors to dissolve, trapping them longer than if it were a dry day outside.

To many, New York is the city of dreams, but you have to be willing to accept it for the good, the bad, and the smelly.

SEE ALSO: Here's the mugshot of the ex-Stanford swimmer convicted of sexually assaulting an unconscious woman that took months to be released

DON'T MISS: 28 incredible photos of monster waves off Sydney that put a pro surfer in the hospital

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NOW WATCH: The Big Bang is not the beginning of our universe — it’s actually the end of something else entirely

Beijing has officially overtaken New York City as home to the most billionaires.

According to Hurun, a Shanghai firm that releases yearly rankings and research about the world's richest people, the Chinese capital has an even 100 billionaires in 2016, while the Big Apple has 95.

"Beijing took the title from New York after minting 32 new billionaires last year, while New York gained four," Gerry Shih of the Associated Press reports. "Rupert Hoogewerf, the founder of Hurun, attributed China's explosive wealth creation to Chinese market regulators allowing a flood of new initial public offerings after holding back new IPOs for several years."

Read on to see which other cities around the world made it on the "Hurun Global Rich List 2016."

SEE ALSO: How old 15 self-made billionaires were when they earned their first billion

20. New Delhi, India

Number of billionaires in 2015: 17

Number of billionaires in 2016: 20

19. Los Angeles, California

Number of billionaires in 2015: 22

Number of billionaires in 2016: 21

17. Bangkok, Thailand (TIE)

Number of billionaires in 2015: 27

Number of billionaires in 2016: 24

It's hot out. Record-breaking hot. This April was the warmest April on record. It was the 12th month in a row to set a new record.

Calling it a trend would be an understatement. This warming is relentless.

But miserably hot summers aren't even the worst problem facing us in the coming decades.

Here are some of the craziest ways climate change will change the US as we know it:

SEE ALSO: A stunning glacier in Iceland shows exactly how much the climate has changed

DON'T MISS: New York is facing its biggest threat ever, and people are still in denial

As oceans get warmer and northern sea ice begins to melt, sea levels will rise, increasing the frequency of floods. That's because as water warms, it grows in volume. And land ice, such as that of mountain glaciers and giant ice sheets, melts.

RAW Embed

Sources: "IPCC Fourth Assessment Report: Climate Change 2007," NASA

Summer will be more like ... death. That's because climate change lengthens summer months and makes them hotter. By the 2050s, New York City could see as many as seven heat waves per year, with about two months' worth — or as much as twice what we currently experience — of days where the maximum temperature is at or above 90 degrees Fahrenheit.

Sources: "Shifting Cities" by Climate Central, Annals of the New York Academy of Sciences

As climate change drives up temperatures, wildfire seasons in the western US will begin to start earlier, last longer, and be more intense.

Source: National Wildlife Federation

Playboy Enterprises just announced that billionaire Hostess owner Dean Metropoulos will purchase the Playboy Mansion, which was previously listed for $200 million. 

The company made the announcement that the Mansion would be hitting the market earlier this year. In February, Hugh Hefner's 24-year-old son Cooper dropped by Business Insider to share his reaction to the announcement, as well as his candid feelings about the state of the Playboy Brand. 

Hefner is the Chief Creative Officer of Hop, a digital multimedia company that launched earlier this year. 

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The popularity of online dating and dating apps is leading to some major design changes in bars and restaurants. 

Some restaurants are adding more two-person tables to accommodate the growing number of couples who are lingering over a first-date drink, after being brought together on a blind date by aps like Tinder and Hinge, reports the Washington Post.

Dating apps mean the more elaborate first date (movies, dinners) have been replaced by drinks that function as getting-to-know-you affairs that may or may not result in a second date. 

Reporter Lavanya Ramanathan profiled a restaurateur named Ashok Bajaj who revamped his design due to this dating boom. When refreshing one of his restaurants, Ardeo + Bardeo, Bajaj decided to ditch booths and install tables for two, after noticing the influx of couples in the restaurant. In another restaurant, Nopa, he installed a series of two-seat nooks in the bar area so couples on dates wouldn't loiter at dining room tables for hours.

Online and app-based dating has influenced the restaurant industry in a number of other ways, from what day of the week dates show up at restaurants to the length of time couples nurse a single drink (too long, according to restaurateurs). You can read the full story on the Washington Post.

SEE ALSO: Americans' shifting drinking habits could change happy hour as we know it

Join the conversation about this story »

NOW WATCH: Bumble founder: Men should stop putting these 4 things in their profiles

Summer is fast approaching. Before you set off for some fun in the sun, make sure you're prepared with the appropriate attire.

Since it's the hottest season of the year for most regions, dressing for summer is about more than just looking good. It's important to choose the right fabrics to feel good, too. 

Linen shirts, lightweight fabrics, and no-show socks are all things you can wear to avoid feeling too constricted. 

Here are the 17 clothing items every man needs for summer. 

SEE ALSO: 11 deadly style sins every guy should avoid making

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A pair of sunglasses to protect your eyes.

When the sun starts to get serious, it's time to protect your eyes.

J.Crew recently came out with a new line of sunglasses, and there's a look for everyone.

J.Crew ($100 - $120)

Chino shorts beat out cargo shorts any day of the week.

Ditch the cargo shorts— chino shorts just look so much better, and they have a much more flattering silhouette.

We recommend you grab a pair that hits above the knee (9 inches or shorter inseam).

J.Crew ($70)

Likewise, dock shorts beat out jorts.

For more casual times (think: Sunday brunch) don't reach for the jean shorts.

Instead, consider a pair of elastic shorts like J.Crew's dock shorts. They're not quite sweat shorts, but they're not quite chino shorts, either — they rest in the nebulous, comfortable in-between area. 

J.Crew ($45)

Multiple venues have canceled indie band The Good English's shows as a result of the letter that its drummer, Leslie Rasmussen, wrote in support of the ex-Stanford swimmer convicted of sexual assault,The Gothamist reported.

Since high school, Rasmussen has been a close friend of 20-year-old Brock Turner, who was found guilty of three felony counts for sexually assaulting an unconscious and intoxicated woman in January 2015. Last Thursday, a judge sentenced Turner to six months in a county jail, which some have decried as a slap on the wrist.

Prior to sentencing, Rasmussen wrote a character statement to Judge Aaron Persky defending Turner and partially blaming an insistence on political correctness for his conviction.

"I don't think it's fair to base the fate of the next ten + years of his life on the decision of a girl who doesn't remember anything but the amount she drank to press charges against him," she wrote. "These are idiot boys and girls having too much to drink and not being aware of their surroundings and having clouded judgment."

The letter drew ire from many who feel her words perpetuate rape culture. Now, four Brooklyn, New York, venues — including one hosting the anticipated Northside Festival — set to host the band this weekend have canceled its shows.

Two of the venues explicitly made public statements about rape culture, according to The Gothamist.

Since facing the public scrutiny, Rasmussen has issued a statement clarifying her words and insisting they had been misconstrued.

"I understand that this appeal has now provided an opportunity for people to misconstrue my ideas into a distortion that suggests I sympathize with sex offenses and those who commit them or that I blame the victim involved," the statement reads. "Nothing could be farther from the truth, and I apologize for anything my statement has done to suggest that I don’t feel enormous sympathy for the victim and her suffering."

Here's Rasmussen's original letter, in full:

SEE ALSO: Over 400,000 people are calling for the removal of the judge who gave the ex-Stanford swimmer a 'lenient' sentence

Join the conversation about this story »

After months of deliberation, the International Tennis Federation has banned star athlete Maria Sharapova from competing for two years. 

Earlier this year, Maria Sharapova failed a drug test at the Australian Open after testing positive for the recently-banned drug meldonium. Here's what the drug actually does to your body.

Produced by Jenner Deal. Original Reporting by Jessica Orwig and Tanya Lewis.

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Eddie Bauer aplinists Adrian Ballinger and Cory Richards just returned from an incredible journey up Mount Everest, which they captured in it's entirety through Snapchat via their EverestNoFilter story. Throughout all of their fan interaction, one of the most frequently asked questions was, "How do you go to the bathroom?" 

Ballinger and Richards recently dropped by Business Insider and we asked them to give us the real story.

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Marijuana's official designation as a Schedule 1 drug— something with "no accepted medical use" — means it is pretty tough to study.

Yet numerous anecdotal reports, as well as some studies, have linked marijuana with several purported health benefits, from pain relief to helping with certain forms of epilepsy.

Still, experts say more rigorous scientific analyses are needed. Use of marijuana, a psychoactive drug, can come with risks, especially in people who may be prone to addiction or mental illness. 

And now, for the first time, researchers have found a link between daily decadelong weed use and a difference in how the brain processes reward. 

Addiction and the brain

For years, researchers have suggested that such a link exists — and if it does, that it could play a powerful role in addiction. An important part of this line of thought is that addicts, far from amoral individuals incapable of making intelligent decisions, simply respond differently to drugs— neurologically, psychologically, physiologically — than people who are not addicted.

And this response is probably the result of many factors outside the person's control, including genetics, behavior, and environment.

So for their study, published on Wednesday in the journal Human Brain Mapping, researchers at the Center for BrainHealth at the University of Texas, Dallas, took a look at the brains of 53 daily long-term pot users (14 of whom met the American Psychiatric Association's criteria for addiction) and 68 people who'd never used the drug daily. Then the researchers showed them a series of objects meant to test their reward response. The objects included one type of fruit (the "natural cue"), a pencil (the "neutral cue"), and either a bong, a pipe, or a joint (the "cannabis cue"), depending on which one the participant said they preferred.

Importantly, this study did not look at so-called recreational users — those who use the drug every few weeks or months. Instead, it focused on people who used the drug every day for an average of 12 years, several of whom met the criteria for being addicted to the drug, and many of whom displayed some signs of past or present problems with weed.

Why? Because the researchers wanted to tease out how changes to the brain's reward pathway might affect who used the drug every day for years — and, more importantly, why.

Not surprisingly, when the chronic users were presented with either the bong, pipe, or joint, they displayed a stronger response in several parts of their brain linked with reward than they did when they were shown the fruit cues. In contrast, the nonusers did not show a significantly greater response to either the weed or fruit cues, and some parts of their brains showed a greater response to the fruit than to the bong, pipe, or joint. 

"We found that marijuana disrupts the brain's natural reward circuitry, making marijuana highly salient to heavy users," Dr. Francesca Filbey, the director of cognitive neuroscience research of addictive disorders at the Center for BrainHealth and an associate professor in the School of Behavioral and Brain Sciences, told Business Insider.

"In essence, these brain alterations could be a marker of transition from recreational marijuana use to problematic use," she said.

Marijuana and the brain

In another 2014 study also by Dr. Filbey, she and her team found that, compared with people who didn't use pot, long-term, heavy users tended to have a smaller orbitofrontal cortex, a brain region critical for processing emotions and making decisions.

And, interestingly enough, the heavy users also appeared to have more cross-brain connections. Scientists think regular users may develop these links as a means of compensating for the difference in size. The regular pot users also had lower IQ scores overall when compared with the people who didn't use the drug.

To arrive at their results — one of the first comprehensive, 3-D pictures of the brains of adults who'd smoked weed at least four times a week, often multiple times a day, for years — the researchers used a combination of MRI-based brain scans.

Still, that study did not show that chronic weed use caused certain regions of the brain to shrink, or that pot use caused lower IQ scores — it simply showed a relationship among those factors.

"We cannot honestly say that that is what’s happening here," Filbey told Business Insider in 2014.

Similarly, the latest study does not show that chronic pot use causes a change in the brain's reward response; the reverse could also be true, that the changed reward response influenced the chronic pot use.

SEE ALSO: What marijuana does to your body and brain

SEE ALSO: The most 'addictive' drugs probably aren't the ones you think

Join the conversation about this story »

NOW WATCH: 7 surprising medical benefits of marijuana

Many men, as they lace up their Oxfords in the morning, think a simple thought: Why can't my dress shoes be as comfortable as my running shoes?

Justin Schneider, founder of new Florida-based shoe startup Wolf & Shepherd, had that same thought, but he decided to do something about it.

Schneider, who has worked as a shoe designer at both Adidas and New Balance, set out to design a dress shoe that looks a lot like the other dress shoes you've worn in your life, but that has hidden technology to make it a whole lot more comfortable.

The tech packed into the shoes includes:

• A memory foam footbed
• A high-density foam heel
• Rubber outsoles
• Carbon fiber arch support

The shoes have patented modular outsoles that can be switched out depending on the season, or entirely replaced after being sent back to the company for 1-2 weeks. The shoes are, on average, a pound lighter than a traditional dress shoe, and use something called a "Swiss insole" to reduce weight.

Since part of the comfort of running shoes is their flexibility, these shoes should be able to move better than your average dress shoe. Wolf and Shepherd has recently switched to a more structured leather that is closer to a traditional dress shoe for their new "Genesis" collection, which will wrinkle less than their first collection did. The leather, according to the company, is sourced from the same tannery that Louis Vuitton uses.

Comfort doesn't come cheap, though. The shoes' retail price starts at $325, which is about equal to the cost of a well-made traditional dress shoe. They also cannot be recrafted except through the company, which is a little more inconvient than a traditional resoling process.

But if you're looking for comfort, there's really nothing else like it on the market.

The company is having former NCAA Division I runner Juris Silenieks wear the shoes as he runs the "Hotlanta Half-Marathon" in Atlanta, Georgia, attempting to set the Guinness World Record for the fastest half-marathon time in dress shoes.

SEE ALSO: The biggest mistake guys make with their business attire

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NOW WATCH: A former SpaceX exec has reinvented the high heel with the help of an astronaut and a rocket scientist

Hydro Hammock is a portable, swinging hot tub. Enough said. 

Business Insider recently posted this video to Facebook and so far more than 20 million people have watched it. You could say that the Hydro Hammock is taking the internet by storm. 

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We've all been there — you're at a restaurant, unsure what to order because you have no idea what a particular menu item is. 

Thankfully, restaurant reservation site OpenTable has made it easy to navigate these tricky terms. Together with Harris Poll, OpenTable surveyed more than 2,000 diners to find out their perspectives on confusing jargon on menus.

While 29% of surveyed diners said that menus are more complicated than they need to be, another 56% responded that they worried ordering a menu item with an unfamiliar ingredient would ruin their meal. 

The surveyors also presented diners with a list of menu terms, asking them if they knew the meaning behind each one. OpenTable then defined the 25 most-misunderstood menu terms, which we've recreated here. 

Feel free to impress your friends and order away, knowing exactly what to expect from the kitchen.

SEE ALSO: The 15 best doughnut shops in America, according to Foursquare

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25. Cremeux — "Dense, soft, classic pudding."

Source: OpenTable

24. Terrine — "A French meat loaf dish, similar to pâté, made with more coarsely chopped ingredients."

Source: OpenTable

23. Semifreddo — "A partially frozen Italian dessert."

Source: OpenTable

Steph Curry has broken an absurd amount of records this year. Meanwhile, Lebron James is trying to win his 3rd NBA Championship. From salary to stats, check out how the two superstars match up.

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When Elon Musk was 17, he lived off a dollar a day for a month to see if he had what it takes to be an entrepreneur.

He explained the experiment to astrophysicist Neil deGrasse Tyson in an episode of Tyson's StarTalk Radio podcast:

In America it's pretty easy to keep yourself alive. So my threshold for existing was pretty low. I figured I could be in some dingy apartment with my computer and be okay, and not starve.

In fact, when I first came to North America — I was in Canada when I was 17 — and just to sort of see what it takes to live, I tried to live on $1 a day, which I was able to do. You sort of just buy food in bulk at the supermarket ... I was like, "Oh, okay. If I can live for a dollar a day — at least from a food-cost standpoint — it's pretty easy to earn $30 in a month, so I'll probably be okay.

I decided to replicate the challenge this past month. I adjusted for inflation — $1 in 1988, when Musk was 17, is the equivalent $2 today — and set aside $62 for the 31-day month of January.

Musk lived off mostly hot dogs and oranges, occasionally mixing in pasta and jarred tomato sauce. I bought mostly bananas, pasta, and peanut butter and would switch it up with the occasional fried egg or sweet potato.

I reached out to Musk after completing the challenge. "That's great, although I would not encourage anyone to live on $1 a day," he wrote me in an email. "That would not be super fun. Also, I did this back in 1990, so a dollar went a lot further back then. Would be much harder to do that today."

(Yes, I realize he just said 1990, but I did the entire month based on the value of a 1988 dollar, and I'm not about to re-do it ... so bear with me. The point still stands.)

Thirty-one days, 14 bags of pasta, six jars of peanut butter, and too many bananas to count later, I completed the "Elon Musk Challenge" with $1.07 to spare. Here's what it was like:

SEE ALSO: I spent only $4 a day on food for a week — and it was grueling

I set aside exactly $62 the evening of December 31 and established a few guidelines for the month-long challenge:

1. No office snacks. If I'm emulating the lifestyle of a struggling entrepreneur, I probably cannot rely on an office stocked with snacks.

2. No "rollover" food. I decided not to eat any food that I bought prior to January 2016.

3. I CAN accept food from other people or any freebies. I wouldn't be actively seeking out free food or asking friends and family to buy me anything — the point of the challenge was not to see how much free food I could accumulate in a month — but if I came across free samples or if someone (outside of my office) offered me a snack or meal, it was fair game.

4. I can spend more than the allotted $2 on any given day. I just can't exceed the $62 over the course of the month. Some days I would spend $8 at the grocery store for supplies that would last several days, while other days, I spent nothing.

5. One cup of coffee per day. For productivity reasons, I did allow myself one cup of coffee from the office Keurig machine each morning. After struggling with caffeine headaches while completing the food-stamp challenge last year, I learned that a cup of coffee would be essential if I wanted a chance at being productive during the work day.

My "strategy" the first couple of days was simply to buy the cheapest food I knew of — pasta and oats — and eat my supplies as I got hungry.

Pictured above are the groceries from my first shopping trip at Trader Joe's.

In terms of flavor, for the first couple of days, there was none. I had accepted at the beginning of the challenge that everything was going to be considerably bland, and I assumed I wouldn't be able to afford much more than pasta and oats.

It only took one traumatizing treadmill run and a series of leg cramps to realize I would need a more concrete plan (and protein) if I had any chance of completing the challenge.

I started by adding a good source of protein — peanut butter — to my pile of loot, tortilla to accompany the peanut butter, and bananas for a bit of potassium.

The best part about your 20s is that you can recover quickly from the inevitable mistakes you'll make as you figure out how to make it in the real world.

That said, there are some poor choices that have lasting effects — like not starting to save money and neglecting your health — that are easily avoidable.

We've sorted through a variety of advice from entrepreneurs and writers on Quora and found recurring themes.

Here are 15 things successful 20-somethings don't do:

SEE ALSO: 18 things successful people do in their 20s

They don't think education and talent are enough to become successful.

High intelligence, natural talent, and degrees from elite universities are all good things to have, but they do not guarantee that you will land a great job — and they mean nothing when not paired with hard work.

"I spent my 20s in corporate environments, and I remember them for working nights and weekends," says Sylvie di Giusto, founder of Executive Image Consulting. "Sweat, hassle, pain, as well as diligence, perseverance, and an enormous amount of effort and energy characterize my career at this point. I've learned that there are very little short cuts when it comes to career success. Success doesn't 'just happen.' Never."

They don't neglect their health.

As you get older, you'll learn pretty quickly that you can't party like you did in college.

"Your hangovers will be so bad at 28 that the idea of staying out drinking all night will be hilarious to you," Meggie Sutherland Cutter writes on Quora.

And the more years out of school you get, the more excessive drinking, smoking, and even an unhealthy diet go from acceptable behavior to dangerous habits.

Communications professor Michael Weston says that 20-somethings also need to pay attention to their mental health, since any potential issues usually arise in your 20s.

They don't spend all of their disposable income.

A 2014 survey of 1,003 people from Bankrate found that 69% of those ages 18 to 29 had no retirement savings.

Your retirement may seem far off, but you're doing yourself a major disservice if you don't recognize the importance of saving as soon as possible.

Entrepreneur Aditya Rathnam says that there's no need to start investing too much, since you're just starting out, but it's essential to take advantage of your company's 401(k) matching program, if one is available, and/or open a Roth IRA account.

Thinking about taking a cross-country road trip? Now's the time. The New York Times recently reported that gas prices are cheaper now than they have been in a decade.

Researcher Randy Olson figured out the ideal route around the 48 contiguous states. Olson used a genetic algorithm to calculate the shortest distances between 50 national landmarks.

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African King Musa Keita I is thought to be the richest person of all time — "richer than anyone could describe," reports Time.

Literally. His fortune was incomprehensible, Time's Jacob Davidson writes: "There's really no way to put an accurate number on his wealth."

He ruled the Mali Empire in the 14th century and his land was laden with lucrative natural resources, most notably gold.

"His vast wealth was only one piece of his rich legacy," reports Jessica Smith in a TED-Ed original lesson. Read on to learn more about the legendary king and see what it was really like to be the richest person in history:

SEE ALSO: How old 17 self-made billionaires were when they made their first million

Musa Keita I came into power in 1312. When he was crowned, he was given the name Mansa, meaning king. At the time, much of Europe was famished and in the middle of civil wars, but many African kingdoms were thriving.

While in power, Mansa Musa expanded the borders of his empire tremendously. He annexed the city of Timbuktu and reestablished power over Gao. All in all, his empire stretched about 2,000 miles.

Mansa Musa was in charge of a lot of land. To put it into perspective, he ruled all (or parts) of modern day Mauritania, Senegal, Gambia, Guinea, Burkina Faso, Mali, Niger, Nigeria, and Chad.

The rest of the world caught wind of his great fortune in 1324, when he made the nearly 4,000 mile pilgrimage to Mecca. He didn't do it on the cheap.