Mental strength takes a long time to develop. 

It is the daily practice of pushing yourself to grow stronger, maintaining realistic optimism, and setting healthy boundaries. Mentally strong people don't do things like waste time feeling sorry for themselves or give away their power to other people.

How do you know where you fall on the spectrum? We asked psychotherapist Amy Morin, the author of "13 Things Mentally Strong People Don't Do."

Morin shared the following 21 signs you're mentally stronger than average, which we've listed here in her words:

SEE ALSO: 13 things mentally strong people don't do

"Mentally strong people understand how their emotions can influence their thinking. In an effort to make the best decisions possible, they balance their emotions with logic."

"While it may be tempting to make excuses, complain about other people, and avoid difficult circumstances, mentally strong people refuse to waste time on unproductive activities."

"Mentally strong people know that although change is uncomfortable, it's tolerable. They focus their energy on adapting to change, rather than resisting it."

The chicken nugget was created by a food scientist at Cornell University more than 60 years ago.

Since then, the breaded pieces of chicken meat have become a part of nearly every fast-food menu.

McDonald's, Burger King, Wendy's, and Chick-fil-A each have their own approach to the chicken nugget, and we set out to find which chain does it best.

SEE ALSO: We tried breakfast from McDonald's, Taco Bell, Burger King, and Wendy's — here's who does it best

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The fast-food greats meet for our chicken-nugget face-off: Burger King, Chick-fil-A, McDonald's, and Wendy's.

First, Burger King's chicken nuggets. These nuggets are firm, but not crispy compared with other options. We paid $5.89 for 10 pieces.

On first bite, we taste a little kick — possibly thanks to the noticeable pepper flakes in the breading. But these nuggets have a spongy texture that feels questionable.

Most high-end restaurants will have something truffle-flavored on the menu, whether it be truffle fries, truffle butter, or truffle mac and cheese. It gives the foods an air of quality and sophistication. But do these products actually have any truffle in them?

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When it comes to your daily hygiene routine — from your flossing habits to your nightly shower — you might think you've got everything down pat.

But we're here to shake things up.

Heeding advice from medical associations and professionals, we compiled the optimal ways to keep yourself clean, healthy. and looking sharp.

SEE ALSO: Why you should never use alcohol to help you fall asleep, according to science

DON'T MISS: Which body part hurts the most when stung by a bee? A scientist put himself through a torturous experiment to find out

1. How often should I wash my hair?

The short answer? Nobody needs to wash their hair everyday. Beyond that, it depends on your skin type: if you have normal or dry skin, once or twice a week should do the trick.

2. How often should I brush my teeth?

The American Dental Association recommends you brush twice a day for two minutes, although they don’t specify what time of day these brushing should happen. So long as you do a good brushing before bed, you should be set. While you sleep, your mouth salivates less, which can lead to cavities.

3. When's the best time to put on antiperspirant or deodorant?

The ideal time is right before you go to sleep. That way, if you’re using an antiperspirant, it has time to close your armpit’s sweat ducts before they have a chance to get sweating in the morning. Most last at least 24 hours, so no worries about not making it to the end of the workday.

Elizabeth Ross "Libet" Johnson, a Johnson & Johnson heiress with an appetite for high-end real estate, is selling her Millbrook, New York, horse farm, the Wall Street Journal reported. Set on more than 600 stunning acres of land, Lightning Tree Farm has a private helipad and an 18-stall horse stable. The property is also host to a large main house with nine bedrooms, eight bathrooms, and a movie theater.

Johnson reportedly bought the house in 1980, then over time bought surrounding parcels to assemble the estate as it is today. In addition to this property, Johnson has also listed the 12,111-square-foot townhouse she owns in New York City. Dubbed "The Vanderbilt Mansion" in homage to its former owners, the home is available for rent for $95,000 a month, or $55 million all in, according to the Observer. 

Compass' Marina T. Schindler and H.W. Guernsey Realtors have the Millbrook listing. Let's take a look inside.

SEE ALSO: Nobody wants to buy this $12.5 million Brooklyn mansion with connections to mobsters and Russian heiresses

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Lightning Tree Farm is located in Millbrook, about 90 miles north of New York City. You could land your helicopter right on the front lawn.

Rolling green hills make for a dramatic setting.

The equestrian facilities include a stable and riding ring.

With the one year anniversary of Ferrari's IPO in October, fans of the prancing horse can now own a piece of the automaker for about $50 a share instead of forking over hundreds of thousands of dollars for a piece of shiny Italian metal.

But for many, there's no substitute to the raw power and emotion of a living, breathing Ferrari. Since the company launched its road car business in 1947, it's reputation has grown from that of a respected racing team to a creator of automotive legends. 

In fact, the company has managed to maintain a waiting list for many of its models without engaging in any forms of traditional advertising. 

Other the years, Ferrari has been responsible for a long line of fast, powerful, and evocative sports cars and supercars. Anyone who has ever encountered a Ferrari has his or her personal favorite. Which is why Business Insider compiled a list of the 10 best Ferraris in the world. 

SEE ALSO: We drove the most important car McLaren has ever made

166 Inter: Built from 1948 to 1950, the Ferrari 166 Inter was based on the company's successful 166 race cars. The model was Ferrari's first international sales success.

The 166 was powered by a 2.0-liter, 90-horsepower V12 engine.

250 TR Testarossa: The 1957 250 TR was one of the first Ferraris to carry the iconic Testarossa badge. Testarossa, or "red head," is a reference to the car's red painted engine head covers.

Like the viral dance move of the same name, using marijuana by "dabbing" is having a moment.

The latest marijuana consumption craze has users chasing bigger highs through a process called "flash vaporization." But unlike the dance, marijuana dabbing poses some major health and safety risks, according to both anecdotal evidence and experts, and is illegal in some states.

Dabbing is when you take a marijuana concentrate, a waxy or butter-like substance that contains highly concentrated amounts of tetrahydrocannabinol (THC) — the psychoactive ingredient in weed — apply it to a hot surface to create smoke, and inhale to get high. There are countless ways to heat the material, from burning in it an electronic vaporizer to lighting it on fire with a blowtorch over a glass bong piece called a nail, and it's up to user preference.

When the internet tells you dabbing gets you high, it means really, really high. The potency of dabs can cause users to pass out, become uncomfortably stoned, or even experience psychedelic effects that border on hallucinations, with one too many rips from a bong.

Marijuana concentrates pack a punch no matter how you ingest them. They're made from blasting a solvent, like butane or carbon dioxide, through marijuana plant matter to extract the THC, then letting the solvent evaporate. The yellow, gooey substance that remains has a THC concentration that's four times stronger than the plant itself, the New York Times reports.

"Marijuana is the beer of THC, as dabbing is to vodka," as one New York City teenager seen dabbing down Fifth Avenue put it to the Times.

In pot-friendly Colorado, where weed is sold legally for recreational purposes, concentrates make up about one-third of overall marijuana sales, the Marijuana Business Daily reports. Some industry insiders are calling concentrates "the future of the industry."

Not everyone is on board with the dabbing craze.

For starters, dousing marijuana in butane, a highly flammable gas, can cause explosions when it meets an ignition source. As dabbing becomes popular, more amateurs turn to the internet for DIY tutorials on how to extract concentrates. But these at-home operations have led to explosions and deaths in recent years, especially when run indoors without proper ventilation.

Dabbing itself appears to be less dangerous than making the supplies, though the risks are still known. Research on how marijuana concentrates affect the body is slim.

"There is some evidence to suggest that the outcomes, like the effects, may be supercharged," Emily Feinstein, director of health law and policy for the National Center on Addiction and Substance Abuse, tells the Times. "Side effects can include: a rapid heartbeat, blackouts, psychosis, paranoia, and hallucinations that cause people to end up in psychiatric facilities."

The negative side effects often last longer than the high.

Dr. Michael Miller, the ex-president of the American Society of Addiction Medicine, tells L.A. Weekly that if you have a predisposition for addiction, the intensity and swift kick of the high that dabbing produces may trigger cravings and cues to use again.

More research around the health risks of dabbing is required, along with better regulation to squash the at-home operations that threaten to undermine the industry's legitimacy.

Even the name, dabbing, has caused confusion among some.

When a news reporter asked two Seattle Seahawks football players, "Do either of you guys dab?" at a press conference in January, they tripped and fumbled over their answers.

"That's illegal in, in … no, actually it's legal in Washington!" Michael Bennett exclaimed.

Of course, the reporter was referring to the viral dance move, made popular by Carolina Panther Cam Newton. It looks like you're sneezing in your arm.

Dabbing, as demonstrated by rapper Rich the Kid:

Also dabbing:

SEE ALSO: 3 things to know before you eat marijuana edibles

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NOW WATCH: This is how long drugs actually stay in your system

Produced by Jacqui Frank. Original reporting by Tanya Lewis.

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Anyone who's spent any time in the kitchen, knows that prepping onions can have an emotional reaction. It's all due to compounds inside the onion that get rearranged when you chop it up. The chopping action releases a gas that irritates the eyes. There is one trick to keeping that gas inside the onion and not in your eyes.

Produced by Rob Ludacer. Original reporting by Jessica Orwig.

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Every pair of jeans has a tiny pocket in the front right pocket. Why? What is it for? Where does it originate? We found out!

Produced by Joe Avella

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A 45-year long study has revealed a few key traits common in hyper-intelligent children. Those with these traits continue onto a life of success.

Produced by Rob Ludacer. Original reporting by Jessica Orwig.

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We've finally settled into fall and that means a slew of new restaurants in New York City.

Of course, not all restaurants are created equal.

Some restaurants are for Wall Street. And others are bar/restaurant/coffee shops by "Entourage" star Adrian Grenier, where you can eat candied bacon quinoa sushi or a taco churro cannoli.

You can see how there's a difference.

With that in mind Business Insider has put together a list of restaurants to serve the Street.

Some of them are in key locations like midtown Manhattan or the Financial District. Others look perfect for clients or a date night that will make you look in the know when it comes to the city's food scene.

You're welcome in advance.

Empellon Midtown

Wall Street is often an endless parade of dinners and lunches by the office. The office is mostly in midtown, and midtown's food offerings are ... not always the most creative.

Plainly said, if you're not careful you can find yourself eating the same cut of steak three nights a week. After a time, this sounds better than it looks on you.

That is why so many people in New York City are excited that Chef Alex Stupak will be bringing his much-lauded Empellon brand to Midtown.

Stupak is known for high-end, creative Mexican fare, and once told Crain's New York that he approaches his food with a "punk-rock mentality."

That's definitely something midtown could use.

King — 18 King Street

King is one of those restaurants that just happen to be perfectly executed — fresh ingredients, wonderful recipes, and an experienced team.

Chefs Clare de Boer and Jess Shadbolt are veterans of London's legendary River Cafe, and news that they would be opening their own spot in New York City had this town's foodies talking before the first grill was fired.

The restaurant's menu changes daily (again, this about ingredient sourcing) so the fare is simple, based on cuisine from southern France and northern Italy. 

Augustine —in the Beekman Hotel, 5 Beekman St.

Famed restaurateur Keith McNally is taking his considerable talents downtown to the Financial District, joining in the wave to revamp the neighborhood and covert it from food desert to food Mecca.

You know who Keith McNally is, by the way. He created Balthazar, Minetta Tavern, and Pastis, among other New York City restaurant classics.

Augustine, located in the Beekman Hotel, will be helmed by the chef in charge of McNally's Bowery restaurant, Cherche Midi. Expect big, fancy, French things.

Prisma is a new photo app that has already been downloaded over 42 million times. Using artificial intelligence, it takes your photos and recreates them in the style of a painting. Here's how it works.

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Turns out mom was right. 

Chicken soup is good for a cold.

But it's not the only old-school remedy that scientists have actually found to be helpful.

Here are nine weird household tricks that you can actually use to ward off pain, soothe a cold, calm a headache, or brighten your smile.

SEE ALSO: 17 'healthy habits' you're better off giving up

RELATED: What 200 calories of your favorite Thanksgiving foods looks like

Feeling a cold coming on? Try gargling with plain water. A study of close to 400 healthy volunteers found that those who gargled with plain water were significantly less likely to come down with upper-respiratory-tract infections (URTIs) — a type of infection often linked with colds and the flu — during the study period than those who didn’t gargle. The researchers concluded that, “Simple water gargling was effective to prevent URTIs among healthy people.”

If you tend to get motion sick on trips, try packing along a couple pieces of ginger candy. One study comparing people taking a placebo with those taking ginger found that just one gram of the root was helpful in alleviating symptoms of seasickness, morning sickness, and nausea induced by chemotherapy.

In general, ginger may also be helpful for relieving gas and indigestion, Stephen Hanauer, MD, a professor of gastroenterology and hepatology at Northwestern University Feinberg School of Medicine, told Prevention.

Mom was right. While the jury’s still out on precisely why chicken soup makes us feel better when we’re sick, researchers are pretty certain that it does. For one study in which researchers were trying to pinpoint the effect the soup had on inflammation (a common component of colds), they found that it slowed the movement of neutrophils, the white blood cells that are the hallmark of acute infection. In other words, the soup appears to help calm down the inflammation that triggers many cold symptoms.

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People often think a dog's mouth is cleaner than a human's mouth. According to Dr. Leni K. Kaplan of Cornell University College of Veterinary Medicine, the reason people believe this because when a dog licks a wound, it can remove debris and contamination, which sometimes expedites the healing process.

However, the fact is a dog's mouth is riddled with bacteria, and coming in contact with contaminated saliva presents a risk of disease and infection.

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The Sony World Photography Competition is the world's largest and most famous of its kind. 

The competition aims to celebrate the planet's best photographers and will be celebrating its tenth anniversary in 2017. 

Last year, there were a record-breaking 230,103 entries from 186 countries submitted to the three main categories — professional, open, and youth.

The final deadline for entries to the 2017 competition is January 10, but we've selected some of our favorites so far below.

This is the annual celebration of the Dinagyang Festival in Iloili City in the Philippines. The religious festival is held every year on the fourth Sunday of January.

This bizarrely beautiful image was composed by Josè Marìa Pèrez from Argentina.

This photo shows the vast scale of the Warsaw University of Technology — the country's leading institute of technology and one of the largest in Central Europe.

Nightmares Fear Factory, in Niagara Falls, Canada, is in the perfect location for a haunted house: a former coffin factory.

It's known not only for supposedly being one of the world's scariest haunted house experiences, but also for the reactions they capture on three cameras hidden inside. 

It's completely dark inside the haunted house, but the flash of the camera illuminates some pretty hilarious faces. 

Nightmares has kindly shared those images with Business Insider.

SEE ALSO: New York City's Financial District has a gory, haunted past

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According to Nightmares, the legend behind the haunted house is a classic ghost story.

Abraham Mortimer owned the Cataract Coffin Factory and was routinely tormented by local kids who said he was "eccentric."

It was all in good fun until one fateful night, when during a struggle between Mortimer and more "hooligans," Mortimer was supposedly crushed to death by empty coffins.

Public image is extremely important to any political election. The International Center of Photography's new exhibit at their Mana gallery in Jersey City, New Jersey, examines how the media's coverage of presidential elections — specifically within the medium of photography — has changed from the 1960s to present day. The show, titled "Winning the White House," covers everything from behind-the-scenes footage to debate photos to selfies.

"Since the 1960s there has been an accumulation of technologies and outlets for campaign photography. This has resulted in more voices in the conversation and more opportunities for voters to engage with different kinds of images," Susan Carlson, the assistant curator for collections at the ICP, told Business Insider.

The show is on view by appointment, Monday through Friday, until January 27, 2017. The ICP shared 23 photos that act as a timeline for how media coverage has evolved since the Kennedy era — keep scrolling to see them.

(All images courtesy of ICP)

SEE ALSO: What it's like to eat dinner at the same restaurant as the Obamas

The show is divided into five main sections. The first is "1960–76: The Magic of the Moving Image."

When it came to curating images for this show, Carlson and the team cast a wide net.

"We searched through newspapers, magazines, social media feeds, ICP's archives, and individual photographers' bodies of work," she said.