Gold output across the globe hit an all-time high in 2015, climbing 1.8 percent to 3,211 tonnes. Much of this growth was led by Mexico, whose output increased double digits (18 percent) from 112 tonnes in 2014 to 133 tonnes last year. Indonesia grew 20 percent, Kazakhstan 29 percent.

This year, global production is expected to level out as project development budgets were slashed during the three-year gold bear market. But with gold prices rebounding, miners are in a good position to be much more profitable.

Below, explore and discover the world’s top 10 gold producing mines.

10. Boddington

The Boddington gold and copper deposit, located 75 miles southeast of Perth, Australia, is the country’s largest gold mine. The first gold was poured in 2009, and in 2011 Newmont produced its first one million ounces from the site. The mining company has identified gold reserves of 19.5 million ounces at Boddington and plans to spend half a billion dollars to expand production.

9. Lihir

Gold was first discovered on Papua New Guinea’s Aniolam Island in 1982, and in 1997, the first gold was poured at the Lihir project, then managed by Rio Tinto. Australia-based Newcrest acquired the gold deposit in 2010 and has since struggled to keep operation costs under control. The company recently announced that expansion will cost a lot less expensive than initially thought, owing to new processing equipment that can more easily handle sulfur.

8. Peñasquinto

Wholly owned by Canadian miner Goldcorp, the Peñasquinto mine is located in the State of Zacatecas. It’s the largest open pit mine in Mexico and the fifth largest silver mine in the world. Besides gold and silver, the project, in operation since March 2010, also yields zinc and lead. In 2007, Silver Wheaton entered into an agreement with Goldcorp to buy 25 percent of all silver output for the life of the mine.

Internship season has wrapped up on Wall Street, and young financiers are heading back to school with all the new skills and knowledge they picked up over the summer.

Of course, the banks can always learn a thing or two from the young people.

Goldman Sachs took the opportunity to survey its interns around the world— in the Americas, Asia Pacific, Europe, the Middle East, and Africa. Summer analysts are typically 20 or 21 years old and about to begin their senior year of college.

The firm picked their brains on everything from how they keep up with the news to how they monitor their spending habits.

You can see the responses below:

Apple didn't give Wall Street analysts many surprises at its iPhone 7 and 7 Plus launch on Wednesday.

The phones' features, particularly the removal of the traditional earphone jack in place of wireless AirPods, had been leaked and widely covered before the unveiling.

Apple also launched the Apple Watch Series 2, which includes built-in GPS and faster processors.

Still, several analysts who cover the company had various explanations for why there could be strong demand for upgrades and for why users won't wait for the iPhone 8 next year, which is expected to get a design overhaul.

Here's some of the commentary:

SEE ALSO: Millennials are fleeing these 10 American cities because of high home prices

"We continue to expect a solid product cycle from the iPhone 7, based on strong upgrades driven by growth in the installed base and pent­-up demand after the weaker iPhone 6S cycle": Simona Jankowski, Goldman Sachs

"We maintain our Buy rating and 12-month $124 price target ... the primary risks are product cycle execution, end demand, and a slower pace of innovation," Jankowski said.

"In general, there were few surprises as the highly anticipated event is well-previewed by various media outlets": Tavis McCourt and Mike Koban, Raymond James

Given low expectations from investors, the analysts believe that wireless audio and the improved camera will convince many people that the upgrade rate should be better compared with the iPhone 6S.

"Higher pricing for iPhone 7 Plus and launch of AirPods a slight positive": Jim Suva, Citi

Investors will view Apple's AirPods, priced at $159, as a positive "given the higher anticipated gross margins on the iPhone 7 Plus and wireless accessories."

When you think of an office, foosball tables, karaoke machines, beer kegs, and free snacks probably don't come to mind ... that is, unless you work at Yelp.

That's right — those are just a few of the enviable perks Yelp offers its 900 New York-based employees.

Founded in 2004 and headquartered in San Francisco, the $3 billion company that allows consumers to locate and review businesses on its mobile app and website now has seven offices around the US and Europe, including one in the heart of Manhattan that Business Insider recently visited.

We went inside the Madison Avenue office to get a clearer picture of what the Yelp culture is really like. Here's what we saw and learned:

SEE ALSO: This is the best restaurant in the US, according to Yelp

Upon arriving at Yelp's New York office on a Wednesday afternoon in August, we were greeted by Paul Reich, vice president of local sales, who would be our tour guide. Our first stop: the Yelp Café.

Reich said this is where Yelp's New York employees — most of whom work in sales — can enjoy a caffeine break Monday through Friday, from 7:30 a.m. until 3:00 p.m.

The entire time we were there, loud, upbeat music was playing throughout the office. Reich told us that the playlists tend to be pretty eclectic: "We don't know whether we'll be hearing Brazilian or samba or even some heavy metal." When we arrived at the office, "Rock Lobster" by the B-52s was playing.

If you're a Wall Street intern about halfway through your first stint in finance, you've probably got tons of questions.

Of course, you might be worried about asking them without seeming naive or underqualified.

Morgan Stanley went ahead and did the dirty work for you — collected questions from current interns and brought them to a group of managing directors and recruiters.

It shared the answers on its website.

We've got the nine most frequently asked questions and answers for you below.

SEE ALSO: A step-by-step guide on making a critical career move to land the Wall Street job of your dreams

How do I differentiate myself from equally qualified summer analysts?

"A key differentiator is how well you work in a team, as teamwork is an integral part of our firm's culture.

"Another is how much of a self-starter you are. It's important to complete an assigned task thoroughly, but it's differentiating if you go the extra mile.

"For example, do more analysis than your manager expects for the project and an additional task no one asked you to do but that you think could help the team.

"This demonstrates your interest, understanding of the product, how you can fit into the team, and how useful you can be."

Is there a fine line between being helpful and being overly eager and annoying? How can you know if you've crossed that line?

"Yes, there is a fine line, but not to worry — there are ways to help keep it in balance.

"Firstly, be mindful of other people's time. Email and ask your manager if you can chat at some point about an idea you think might add value, or pick a time when he or she doesn't look too busy.

"Another tip is to prep yourself before you talk to a manager. For example, write down the points you want to get across ahead of time so you know what you want to get out of that meeting."

When should I speak up at a meeting and when is it just better to pull my manager to the side and quietly ask a question or offer an idea?

"Tough question — the answer differs very much from business to business and group to group.

"The best thing is to spend the first few weeks of your internship observing and getting a feel for how the team works. Many of our businesses actively seek out summer analysts' views because they benefit from having a fresh set of eyes looking at a process, or coming from a totally different angle.

"But if you're just not sure, then err on the side of caution and pull your manager aside after the meeting to offer up an idea."

"Gold Base" is a facility in California owned by Scientology, the secretive religion based on the works of science fiction author L. Ron Hubbard.

Hubbard died in 1986, but there are Scientology bases and buildings around the world where followers are encouraged to buy his works.

In short, Scientologists believe that "thetans" cling to human souls and are the cause of psychological issues. They say that thetans were spread over the universe in the fallout of an intergalactic war caused by an alien dictator named Xenu. 

Scientologists believe in a form of therapy called "auditing" that uses an electro-magnetic "e-reader" to revisit past memories. They reject tradional psychotherapy in favour of their own form of therapy.

Gold Base is one of the largest and most secretive Scientology compounds in the world, and is essentially the religion's headquarters. The church and its members have publicly identified the location as belonging to the religious organisation. It's protected by a sturdy fence and microphones to detect intruders.

But someone has been able to fly a drone over Gold Base and record two 4K-quality videos showcasing life inside Gold Base. Scientology journalist Tony Ortega has published an in-depth examination of the footage with the help of former Scientologists.

Here's a look inside Gold Base:

Here's the first flyover video:

Here's the first video in full, but we're going to break down what you see here.

It starts with a view of the full base:

via GIPHY

There's a playing field near the drone, and people are playing football.

Many former Scientologists claim that life in Gold Base is not a pleasant experience. Ron Miscavige, the father of Scientology leader David Miscavige, recently published a book in which he claims that people are too exhausted to play sports.

So how come people are out on the playing field? Ortega includes some speculation on his blog that the leader of Scientology was away and people had a rare bit of free time.

Consultancy and accountancy firm EY this week released a report called "Disrupting the disruptors" looking at digital entrepreneurship in the G20.

In it, EY grouped the G20 members into four, ranking them on how accommodating they are to digital entrepreneurship.

To do that, EY looked at four factors: access to finance, entrepreneurial culture, regulation and tax (called digital business environment in the report), education, and support (called digital knowledge base and ICT market).

For each category, EY gave countries a mark out of 10 and we've rounded up the ranking for entrepreneurial culture below.

EY doesn't reveal its exact methodology but makes clear in the report that a big factor is the number of patents generated by each country, rather than simply the number of new companies started up. This means it looks like EY is trying to measure entrepreneurship within existing companies — clever.

Check out the ranking below:

20. Russia = 1.99

Access to finance: 3.53.

Digital business environment: 5.53.

Digital skills and entrepreneurial education: 4.18.

Digital knowledge base and IT market: 3.39.

19. India = 2.46

Access to finance: 5.20.

Digital business environment: 5.53.

Digital skills and entrepreneurial education: 3.85.

Digital knowledge base and IT market: 2.40.

18. Italy = 2.51

Access to finance: 2.45.

Digital business environment: 4.87.

Digital skills and entrepreneurial education: 5.66.

Digital knowledge base and IT market: 4.38.

The United States is home to several iconic architectural landmarks — everyone knows the Empire State Building and the Statue of Liberty — but the country also has a great number of lesser championed masterpieces.

We have compiled a list of the coolest works of architecture in the country that often get overlooked.

These include old and new buildings and structures from museums to religious spaces, office buildings to train stations.

Here are 21 of the best buildings to see in America:

21. The Walker Art Center in Minneapolis is known for its angular, box-like shape. The building was designed by the architect Edward Larrabee Barnes, and was updated and extended by Herzog & de Meuron in 2005.

20. A beautiful example of Spanish Renaissance architecture, Saint Louis Cathedral is one of the most iconic landmarks in New Orleans, Louisiana.

19. Just outside of Washington D.C., Washington Dulles International Airport in Chantilly, Virginia, is known for its sleek, curved main terminal, which was designed by the Finnish architect Eero Saarinen.

To maintain order in the classroom — and to keep their jobs — there are some things teachers just can't tell their students, even if they want to.

But some of these things, while perhaps controversial, could end up being a service to young people, if only someone would just tell them.

So we asked teachers everywhere to weigh in on the one thing they'd love to tell their students but can't, and more than 50 teachers shared their insights.

We've (anonymously) included some of the most constructive thoughts here:

SEE ALSO: 23 teachers share the weirdest thing they've ever experienced on the job

SEE ALSO: 19 things teachers say parents should do at home to help their kids succeed

Really, all this stuff you learn is probably not that important

What is important is the life skills you learn while completing the tasks in class.

You learn how to argue effectively and communicate with different types of people. You learn how to listen to others and respond respectfully. You learn so much that you don't even realize because it seems disguised by homework and essays. But really, you are learning to be independent adults more than you know.

Don't waste this opportunity

Please just know that I love teaching and I sincerely want to help you. But I can't help you if you don't put in the effort. I chose this job because I'm passionate and hardworking and I know my s--t, and I will help you get to where you need to be. But you need to meet me halfway.

You may not realize how important it is to do well in school. You grew up in a tiny apartment in a horrible neighborhood, your parents aren't educated, you're working 18 hour-days, and your neighbors are selling drugs — and maybe you think this is all normal, but it's not, and you have a chance to get out of this.

But you're not taking that chance. And I don't know what you think your life is going to be like if you don't graduate high school and go to college, but you're not going to get out of the South Bronx — you'll be surrounded in this unsafe, crime-ridden neighborhood, it'll be the same thing with your own kids.

It's so frustrating because education opens so many doors, and people around the world would kill to have this educational opportunity. Malala was shot in the freaking head for it. And you're just throwing it all away, and that makes me want to tear my hair out.

The world can be very harsh

You are more than what others judge you to be.

It's the 15th anniversary of September 11, 2001, the date of the deadliest attacks on US soil since the Japanese bombed Pearl Harbor in World War II.

Nearly 3,000 people died in the 9/11 attacks, which The New York Times called the "worst and most audacious terror attack in American history."

The nation is still working to move past the tragedy.

These photos tell the story of what happened that morning, much of which was captured on live television.

SEE ALSO: Here are some of the poignant artifacts you'll see at the new 9/11 memorial museum

The morning of September 11, 2001, started off like any other. The Twin Towers stood tall in the Financial District, as they had for more than 30 years.

At 8:46 a.m., American Flight 11 crashed into the North Tower of the World Trade Center. At first, newscasters weren't sure whether it was an accident or a deliberate attack.

At 9:03 a.m., United Flight 175 crashed into the South Tower, leaving no doubt that this was an attack. Some news channels captured the moment on live television.

Ever wonder where Wall Streeters come from?

It turns out that many of them — at least the ones based in New York City — went into finance from one of 10 schools.

That's according to Emolument, a salary benchmarking website that collects self-reported pay data.

Emolument surveyed 2,800 NYC-based front- and back-office investment banking professionals. It did not include staff like those working in HR or communications.

Here are the top colleges.

SEE ALSO: A step-by-step guide on making a critical career move to land the Wall Street job of your dreams

10. University of Michigan & Ross School of Business — Ann Arbor, Michigan (1.6%)

9. Rutgers University — New Brunswick & Newark, New Jersey (1.7%)

8. MIT & Sloan School of Management — Cambridge, Massachusetts (1.9%)

When we think about company founders, especially in the tech industry, there's the enduring story of the college dropout — Peter Thiel will even fund kids to not go to college. 

Yet, some foundational knowledge and connections gained in business school can be useful for a founder.

PitchBooktracked business-school graduates over the last 10 years and found which ones were churning out founders and companies, as well as raising capital.

There are plenty of schools concentrated around tech hubs like Silicon Valley, but this list shows it's not always a requirement. 

Here are the top 25 best business schools for entrepreneurs.

SEE ALSO: The 17 best colleges for startup founders

25. Pepperdine University

Entrepreneur count: 77

Company count: 73

Capital raised: $1.5 billion

24. University of Virginia

Entrepreneur count: 82 

Company count: 77

Capital raised: $768 million

23. Yale University

Entrepreneur count: 83

Company count: 77

Capital raised: $1 billion

The most expensive housing markets in America are primarily packed into one state: California. 

The Golden State dominates Coldwell Banker's annual Home Listing Report, which ranks the most expensive places to purchase homes in America, claiming every spot in the top 10 and 18 total out of the top 25. 

To determine the most expensive cities, Coldwell Banker analyzed the average listing price of more than 50,000 four-bedroom, two-bathroom homes for the period between January 2016 and June 2016. The ranking covered 2,168 markets across the US, excluding any with fewer than 10 listings.

So what makes California so desirable?

"It all goes back to the old adage in real estate about location, location, location," Charlie Young, CEO of Coldwell Banker, told Business Insider. "In California, you've got a confluence of an amazing climate, strong economy with high-paying jobs, and a tech sector attracting a competitive environment." 

Looking even deeper, six cities within the top 10 can be found inside Silicon Valley, which makes sense given the multitude of growing tech companies that are paying top dollar to attract new employees — and homebuyers — to the area.

"In Silicon Valley, you’ve got Apple, you’ve got Google, you’ve got Facebook. You’ve got the big players in the new tech economy," Young said. "For the foreseeable future, they’re there, and that’s going to drive those markets."

And at the end of the day, "you can’t discount the fact that it’s California," Young noted. It's always been an aspirational place to live — and that isn't likely to change any time soon. 

Read on to check see which cities make up the 25 most expensive housing markets in America, where the average listing price is at least $1 million. 

SEE ALSO: The 10 most affordable places to buy a home in the US

DON'T MISS: The 30 most expensive colleges to live near

25. Walnut Creek, California

Population: 68,910

Average cost of a 4-bedroom, 2-bathroom house: $1,004,900

Median household income: $80,399

24. San Jose, California

Population: 1,026,908

Average cost of a 4-bedroom, 2-bathroom house: $1,011,871

Median household income: $83,787

23. Concord, Massachusetts

Population: 19,830

Average cost of a 4-bedroom, 2-bathroom house: $1,040,290

Median household income: $132,385

As a parent, handling stubbornness pretty much comes with the territory.

And as a father of an eight-year-old and four-year-old, I'm earning my parenting stripes on a daily basis.

Yet, when my kids act stubborn, it's easy to shrug it off, since they're kids.

But when I see an adult act stubbornly — with no reason other than pure selfishness — I have absolutely zero tolerance for it.

In fact, allowing stubbornness is the only way that stubbornness grows.  

Stubbornness is not an excuse and, for the life of me, I can't stand when stubborn adults take pride in getting their way as if they've achieved something.

So, let's make a pact to stand up to stubbornness once and for all.

SEE ALSO: 19 types of coworkers you absolutely can't stand

1. The stubborn coworker

Stubbornness is defined as "refusing to change one's mind or course of action despite pressure to do so; unyielding or resolute." Ugh, even having to read and write the definition makes me want to vomit. Gosh, I can’t handle stubbornness!

OK, OK, enough venting, it’s back to business. And speaking of business, stubbornness in the workforce has two conflicting sides. First, let’s focus on my least favorite part of the argument for the "Pro Stubborn Debate." It goes something like, "If I really want something, I have to go for it and not let anyone stop me." Drop the mic, and walk off stage, right?

Seriously? Now, as a person who is driven in everything I do, I totally understand and can relate to that statement. But looking at being "stubborn" as a point of pride — as if not being stubborn is a sign of giving up and giving in — is not a free pass to be rude.

Usually what ends up happening is said stubborn person is perceived not as "driven" but rather as a colossal jerk. Using the argument for being a stubborn adult due to your "passion" is like saying your "love" for beer means it’s OK if you’re drunk all day.

Stubbornness — like any other crutch — is a negative attribute of a person's character, which affects others. And that is where I have a problem with the whole "stubborn-means-driven professional" excuse. If you’re stubborn all the time at work, you will alienate every single person around you, without fail.

For starters, you’ll look like someone who can’t collaborate with their peers. I mean, you’re always correct so how can anyone work with you, right? Also, it shows you’re a lousy communicator in general. After all, being stubborn means you don’t even listen to what others have to say. You may hear them, but won’t listen and that means you can’t connect.

And if those reasons aren’t enough, being stubborn shows you’re inflexible to change, or ideas other than your own. So, rather than stick with being stubborn, use your motivation to succeed on the inside; pushing yourself harder and harder, telling yourself you’ll be on top. However, don’t let your stubborn beliefs cloud your judgment of disconnecting with your peers … and ultimately tanking your career (hmm, I believe there’s a book about that).

Tip #2: The Stubborn Partner

Of all the stubborn characters out there, hands down the most difficult of all is the stubborn partner.

Whether you're married or just dating, when you are involved with a stubborn partner it will make working with a stubborn coworker seem like a piece of cake. In fact, it would make dealing with an entire corporation of stubborn colleagues seem like a piece of cake.

Care to argue this one? Not likely, since 99.9% of the entire dating world has at least once dealt with a stubborn partner who made the relationship more toxic than that the feces-infested waterways of the Rio Olympics (check out HBO's Real Sports to learn more. It's disgusting!).

So why on earth would anyone in their right mind insist on remaining stubborn when most likely they had nothing but misery from being on the receiving end? With that, if we can only take one thing from a failed relationship, it's how the rude actions of an unmannerly dater will teach you wonders about what you don't want in a partner. For many, it's stubbornness.

Please don't take this as me saying you should jump ship from a relationship the second your partner refuses to change their mind about not liking your buddy Jim or not wanting to go to the Opera. After all, in any relationship you will never see eye to eye on everything so pick your battles carefully.

With that, being stubborn once or twice does not make a partner terrible. However, the issue is the non-stop stubbornness where the relationship is about as one-sided as a sumo wrestler playing tug-of-war with a toddler.  This is where the main problem with being a stubborn exists: the inability to put your needs, wants, and desires aside for the happiness of someone you care about.

In fact, I'll argue that by not doing so, it means you don't care about that person in general. So, if anyone is reading this, then thinking of their partner, and nodding knowingly, please do not run for the hills quite yet. Instead, point out when someone is being stubborn, regardless of how many times you have to remind them.

In a situation like this, it's proper to make it known and discuss the issue. On the flip side, if you are a partner who insists on being stubborn because you insist on always getting your way, take note of this article and this tip in particular. Not doing so, and insisting on being stubborn could lead you to a standing table for one.

3. The stubborn in-law

The phrase, "You can pick your partner, but you can't pick your in-laws" is something every dater should remember.

The term in-laws refer to marriage, but even unmarried couples feel that their partners' parents have a big impact on both their lives, even if there is no ring yet. In fact, based off the wonderful emails I receive many of you feel like a prize fighter in a ring, having to dodge punches from stubborn in-laws on a regular basis.

Even though my in-laws are awesome (and I'm not just saying this because they read my work), trust me I'm well aware of what life is like on the other side. In fact, I discuss this in How to Handle Rude In-Laws, which outlined some horror stories of monster in-laws. So, whether you're the son/daughter in-law dreading the next family dinner with "those that will go unnamed," remind yourself of one key fact: You're an adult!

Stubborn in-laws are a breed of their own. They like things their way and they can't see why you can't figure that out "after all these years." It's draining, but you can't hide.

First, if you plan to marry once (as is the point), you're with them for life and you don't want to have a divide between you and your partner over their in-laws.  Yes, I understand it's your in-laws making the divide. Yes, I understand it's their fault. But just hear me out.

Being a proper son/daughter in-law means you have to take the high road. Don't pander to their every stubborn need, but don't be a jerk either. They insist on the same restaurant? Get together ahead of time with the other family members, and make reservations to beat them to the punch. Now it's a "group idea" rather than yours. There's power in numbers, folks.

They nag you about your job? Remind them that it makes you happy and that's what's most important. Don't let their opinion of how you should live change your mind about your plans.

And if they insist on being the third party to you and your partner's life decisions, kindly take their advice and do as you please anyway.

See, stubborn people will always be stubborn. You can't change them; you can only help to call them out. In-laws "influence" is figurative, kind of like a store clerk who says that shoes that cost $500 are the best in the world, but the ones you like for $50 will do just fine.

Properly take their advice, just not to heart. Nod, say thanks, and go on your way. They'll be gone in a couple of hours. 

It's been 15 years since the attacks of September 11, 2001. But for millions of Americans, haunting memories of that day are still fresh, and many lives were changed forever. 

On 9/11, terrorists hijacked four planes and were able to crash two of them into the World Trade Center's twin towers in New York and one into the Pentagon.

The remaining jet crashed in Pennsylvania when passengers overpowered the hijackers.

A day that started out with clear blue skies ended with a mass of twisted, smoldering metal where the Twin Towers once stood, leaving 2,977 people dead in New York, Virginia, and Pennsylvania, along with the 19 hijackers.

September 11 happened over a decade ago. The Washington Post's Aaron Blake tweeted that a quarter of Americans are too young to remember it. I have three kids who have no memory of it at all — they weren't born yet.

But we certainly don't want to forget, even as we get on with our lives. So in memory of that day, here are 20 images that capture what no American should forget. And as someone living in New York City at the time, here's what it was like to witness the tragedy as it unfolded.

SEE ALSO: Photos show the moment President George W. Bush learned of the 9/11 attacks

The Twin Towers of the World Trade Center were a familiar sight to New Yorkers. For decades, you looked up, and they were there. It was a reassuring sight. I visited the towers many times and gazed upon them many more.

On the morning of September 11, I had just finished voting in Brooklyn when I looked up and saw that one of the towers was on fire. Just a few minutes later, a second plane crashed into the other tower. Something was very wrong.

President George W. Bush was at a school event when he was informed. The expression on his face says it all. No one in the government knew how serious the threat was.

With the onslaught of emails we receive every day, it's hard to imagine how anyone could keep up professional email habits at all times.

To make this task a little less daunting, we asked experts to highlight some of the least professional behaviors you could demonstrate when sending an email.

While mastering the art of good email etiquette doesn't mean sending out beautifully crafted prose each time — that would take forever — if you can avoid these bad habits, you'll be off to a great start.

SEE ALSO: Here is the perfect way to end an email — and 27 sign-offs you should usually avoid

DON'T MISS: 18 unprofessional habits that could cost you your job

Sending 'urgent' emails that aren't urgent

"Like the boy who cried wolf, if you abuse the urgent marker, it won't be long until no one will pay any attention to it,"Rosemary Haefner, chief human-resources officer for CareerBuilder, tells Business Insider.

And when you finally do send a truly urgent email, no one will pay attention, she says.

Being too casual

While the tone of your message should reflect your relationship with the recipient, Haefner says, too much informality will make you come across as unprofessional.

She advises being judicious in your use of exclamation points, emoticons, colored text, fancy fonts, and SMS shorthand.

What's more, not everyone can quickly decode acronyms, Rosalinda Oropeza Randall, an etiquette and civility expert and the author of "Don't Burp in the Boardroom," tells Business Insider.

"Be especially mindful if you work with people from different generations, have language barriers, or prefer a more traditional tone," she says.

Being too stiff

At the same time, you don't want to come off as a robot.

"It's OK to add a bit of enthusiasm or personality to your emails," Vicky Oliver, author of "301 Smart Answers to Tough Business Etiquette Questions" and "301 Smart Answers to Tough Interview Questions," tells Business Insider.

She laments that sometimes she receives "one-line emails that are so transactional they sound like an automaton is responding."

Completed in 1973, the original World Trade Center complex was dubbed a "dream come true" by Governor Nelson Rockefeller at the official ribbon cutting ceremony on April 4.

After the September 11, 2011 terrorist attacks left a hole in New York's skyline, ideas started spewing about what and how to rebuild.

Years later, One World Trade stands in its place. It's not just the Western Hemisphere's tallest building — it has also become a symbol of American pride.

See how the original World Trace Center evolved into today's Freedom Tower after the attacks of 9/11. 

Brittany Fowler contributed to this post.

SEE ALSO: 17 One World Observatory Instagram shots that will take your breath away

Construction on the original towers began in February 1967 with less than a $500 million budget. Architect Minoru Yamasaki designed two 110-story tall towers that were to be constructed as hollow structures supported by steel columns.

Source: New York State Education Department, History.com

The Port Authority and New Jersey Engineering Department aided in the complex's construction. Over 10,000 workers were involved in the building of the complex, which included both towers and a five-acre outdoor plaza with a 25-foot-tall Fritz Koenig sculpture.

Source: New York State Education Department, History.com

There were 43,600 windows in the twin towers and over 600,000 square feet of glass. Each building accommodated 50,000 workers and around 200,000 daily visitors.

Source: New York State Education Department, History.com

Every now and then, a scientific discovery comes along that is just so wild that you can't wrap your head around it at first.

Electricity, the theory of relativity ... the slinky. It's these wild, new advancements that push the boundaries of science and end up changing out lives.

But sometimes, a crazy-sounding discovery or invention is just that: crazy. And behind it is somebody willing to glue together bones or hire a man to turn a crank for fame or profit.

There's nothing like a good old-fashioned hoax to remind us to be a little skeptical of outrageous scientific claims.

Here are 10 of history's juiciest scientific scandals.

SEE ALSO: Here's how a man faked one of the biggest archaeological discoveries in history

DON'T MISS: Here's the only thing you need to know about Mars being 'the same size' as the moon on August 27

Johann Beringer's lying stones in 1725

The find: a collection of stones on the outskirts of a Bavarian town, brought to Johann Beringer, the chair of natural history at the University of Würzburg, by a few of his students. There were almost 2,000 stones, some carved with images of "lizards in their skin, birds with beaks and eyes, spiders with their webs, and frogs copulating,” the Guardian writes. Others had astronomical objects and Hebrew letters etched into them.

Beringer speculated that the stones were fossilized relics from the Great Flood, rejecting the idea that they were manmade. In fact, he was so sure that he wrote an entire book about it.

The fallout: Just as Beringer's book was published, the boys brought Beringer one last stone. The stone was etched with Beringer's name. It turns out the stones had been planted by two of Beringer's colleagues. They became known as lügensteine, or "lying stones."

Source: The Museum of Hoaxes, The Guardian

The perpetual motion machine of 1813

The find: a novel invention, the brainchild of a man named Charles Redheffer. It was a machine that remained in perpetual motion, never stopping — a perpetual motion machine.

The fallout: After noticing a slight wobble in the machine, a skeptical mechanical engineer named Robert Fulton challenged Redheffer, claiming that he could find the mechanism keeping the machine in motion.

And he did just that. It turns out that the machine's source of unstoppable energy was an old man in an attic, turning the crank while munching on a piece of bread.

Source: The Museum of Hoaxes, The Guardian

Life on the moon in 1835

The find: According to the New York Sun, it was a "new theory of cometary phenomena." Apparently, an astronomer named Sir John Herschel had not only discovered new planets orbiting other stars, he had "solved or corrected nearly every leading problem of mathematical astronomy."

The most exciting of these new astronomical discoveries: life on the moon.

The fallout: It turns out that not only had Herschel not actually found life on the moon or cracked the entire field of mathematical astronomy, he wasn't even aware of these alleged discoveries, much less that they had been linked to him.

Source: The Museum of Hoaxes

Savvy hiring managers can glean a ton of information about you by asking just a few, well-chosen questions.

But while they may seem simple — that's the point — some are actually designed to get you to reveal information you may have been trying to conceal. In other words: they're trick questions.

"To uncover areas that may reflect inconsistencies, hiring managers sometimes ask these tricky questions," says Tina Nicolai, executive career coach and founder of Resume Writers' Ink.

But they're not just about exposing your flaws, says Lynn Taylor, a national workplace expert and the author of "Tame Your Terrible Office Tyrant: How to Manage Childish Boss Behavior and Thrive in Your Job." These types of questions can help hiring managers break through the "traditional interview noise and clutter," and get to the "raw you." 

Here are 21 common examples, complete with advice on how to ace each one:

SEE ALSO: The most common questions hiring managers ask during job interviews

Can you tell me about yourself?

Why do they ask this? They ask to determine how the candidates see themselves as it pertains to the position. "The employer wants to hear that the candidate did their homework," says Nicolai. The interviewer is also listening for a level of confidence in how well the candidate portrays herself through the information that is communicated. Additionally, the interviewer is listening for strong behavioral competencies, which help determine a right fit with the job. If this opening answer is weak, it can send the remainder of the interview into a tailspin or cut the interview short."

What makes it tricky? It can tempt you to talk about your personal life — which you shouldn't! "Most candidates are not versed in seeing this as a trick question, so they may answer by speaking from a personal perspective: 'I have three kids, I'm married, etc,'" Nicolai says. "Believe it or not, even the most seasoned candidate falls for this question especially when prompted by the interviewer to elaborate."

What response are they looking for? A focused, laser-sharp answer conveying your value to the organization and department. "The employer wants to hear about your achievements broken down into two or three succinct bullet answers that will set the tone of the interview," she says. Remember, what we tell people about us is what they hear. So stay sharp and convey your top strengths when answering this question.

For example, you can try something like: "I am known for turning around poor performance teams as a result of my innate skills in analyzing problems and seeing solutions very quickly." This statement tells the interviewer that the candidate has analytical skills, problem-solving ability, and leadership ability to turnaround business performance, among other things.

"At least four behavioral skills are conveyed in this simple response, and it sets the tone for the interviewer to ask more targeted questions," Nicolai says.

How would you describe yourself in one word?

Why do they ask this? This will most likely come up to elicit several data points: your personality type, how confident you are in your self perception, and whether your work style is a good fit for the job, explains Taylor.

What makes it tricky? This question can be a challenge, particularly early on in the interview, because you don't really know what personality type the manager is seeking. "There is a fine line between sounding self-congratulatory versus confident, and humble versus timid," Taylor says. "And people are multifaceted, so putting a short label on oneself can seem nearly impossible."

What response are they looking for? Proceed cautiously, Taylor warns. "If you know you're reliable and dedicated, but love the fact that your friends praise your clever humor, stick with the conservative route."

If you're applying for an accounting job, the one-word descriptor should not be "creative," and if it's an art director position, you don't want it to be, "punctual," for example.

"Most employers today are seeking team players that are levelheaded under pressure, upbeat, honest, reliable, and dedicated," she adds. "However, it would be a mistake to rattle off adjectives that you think will be well received. This is your opportunity to describe how your best attributes are a great match for the job as you see it."

How does this position compare to others you are applying for?

Why do they ask this? They're basically asking: "Are you applying for other jobs?""The hiring manager is first trying to figure out how active you are in your job search," Nicolai says. The interviewer wants to see how you speak about other companies or positions that hold your interest — and how honest you are.

What makes it tricky? If you say, "This is the only job I'm applying for," that'll send up a red flag. Very few job applicants apply to only one job — so they may assume you're being dishonest. If you openly speak about other positions you're pursuing, however, and you speak favorably about them, the hiring manager may see you as unattainable and pass. "Speaking negatively about other jobs or employers isn't good either," she says.

What response are they looking for? It is appropriate to say, "There are several organizations with whom I am interviewing, however, I've not yet decided the best fit for my next career move."

"This is positive and protects the competitors," Nicolai says. "No reason to pit companies or to brag."

Today is the 15th anniversary of the September 11 attacks, the largest and most destructive terrorist attack that ever took place on US soil. 

Remnants of the attack remain. Today, two museums — the Shoreline Trolley Museum and the Trolley Museum of New York of Kingston, New York — have opened exhibits of two preserved PATH train cars. These were the only two PATH train cars out of seven that have survived the attacks below the World Trade Center as it crumbled.

Though New York City has plenty of other memorials and museums dedicated to the victims of the attack, these trains give a totally immersive look into one of the most haunting moments in US history. Take a look inside.

SEE ALSO: Video shows Clinton stumble, struggle to walk as she enters van to leave 9/11 memorial event

The cars were purchased by Port Authority of New York and New Jersey in 1965. The train ran through Newark, New Jersey, and Manhattan for 35 years until the day of the attacks.

Inside, you can see the distinct 1960's designs, from the earth tones to the faux wood side paneling.

The two cars were preserved differently. The Shoreline Trolley Museum restored the car to its appearance before the attacks, but the Kingston Trolley Museum decided to keep the cosmetic damage, including paint chips and body damage.