SpaceX just launched Falcon Heavy, its most powerful rocket to date.

On Tuesday, the 23-story-high system ignited and blasted off from Launch Complex 39A in Florida, the same platform where the Apollo astronauts took off for the moon decades ago. Minutes later, two of the rocket boosters landed safely back on the ground.

This is the first time Elon Musk's private space company has tried to launch a rocket quite this big.

Falcon Heavy is re-usable, expandable, and cheaper than the competition. But Musk was careful to emphasize that this launch is still just a test. It'll be at least several hours before we know whether or not the dummy named Rocketman made it safely through the radiation fields near Earth's Van Allen Belt. 

"There's so much that could go wrong," Musk told reporters on Monday. "If something goes wrong, hopefully it goes wrong far into the mission, so we’d at least learn as much as possible along the way." 

Take a look at the massive experiment underway at the Kennedy Space Center:

SEE ALSO: We're on the ground at SpaceX's launch of its biggest and most powerful rocket — here's the latest

Falcon Heavy launched from NASA's Kennedy Space Center at Cape Canaveral. SpaceX says it's the most powerful rocket in operation today "by a factor of two."

At 230 feet high, Falcon Heavy is as tall as a 23-story building.

The rocket system is equipped with 27 engines capable of generating more than 5 million pounds of thrust. "That's 4 million pounds of TNT equivalent," Musk said on Monday.

Falcon Heavy is the most powerful rocket the US has seen since the Saturn V moon missions took off in the 1970s.

• There are certain foods that can both increase your libido and improve your performance.
• While most people know about oysters, chocolate, and red wine as aphrodisiacs, they may not know oatmeal, steak, and pomegranites also have aphrodisiac qualities. 
• Sipping on green tea can also help promote blood flow and in turn increase your sex drive.

Well, you’re going to need more than a four-minute Marvin Gaye song to get the job done; you’re going to need the proper fuel.

Food has long been used to increase sexual desire (hey, a healthy pour of wine never hurt, either), but did you know there are foods that can actually improve your performance? But you don’t need to resort to any exotic foods from faraway lands; these common foods will all but ensure you a successful session between the sheets. Just make sure to avoid these 27 Foods That Kill Your Sex Drive in the first place!

Spinach

Come to think of it, Popeye and Olive Oyl were always chasing one another around. Eating spinach puts you in the mood by increasing blood flow below the belt. “Spinach is rich in magnesium, a mineral that decreases inflammation in blood vessels, increasing blood flow,” explains Cassie Bjork, RD, LD of Healthy Simple Life. “Increased blood flow drives blood to the extremities, which, like Viagra, can increase arousal and make sex more pleasurable,” says psychotherapist and sex expert Tammy Nelson Ph.D. “Women will find it is easier to have an orgasm, and men will find that erections come more naturally.” So, you could reach for one of these heart-shaped boxes of chocolates from our list of Best and Worst Valentine’s Day Candy in America, or you can make each other swoon with spinach! Or both, because…see the next one!

Dark Chocolate

Chocolate increases both serotonin and dopamine levels in the brain, making us happy and lowering our stress level—both “mood” boosters if you know what we mean. Another theory is that cocoa increases blood flow through the arteries and relaxes blood vessels—sending blood to all the right regions. Whatever the reason, chocolate is never a bad thing.

Peppers

The hotter they are, the better. Hot peppers increase your metabolism and stimulate endorphins, making you sweat, plumping your lips, and speeding up your heart rate. That gets the blood flowing to all the essential areas. The net result? Better sex and a more memorable finale. (If you’re planning on handling habañeros, however, make sure that you wash your hands before getting near sensitive body parts.)

• Tesla and SpaceX CEO Elon Musk was interviewed for an intensely candid Rolling Stone profile.

• He discussed his views on relationships and loneliness.

• Musk has been married twice, and recently split from his girlfriend actress Amber Heard.

Elon Musk got candid about his personal life in an in-depth Rolling Stone interview.

He spoke of his breakup with ex-girlfriend Amber Heard, expressing his heartbreak over their parting.

It's an unusual move for Musk, who said in 2010 that he would "rather stick a fork in my hand than write about my personal life."

The CEO of Tesla and SpaceX went on to discuss how difficult it is for him to meet people, saying he is looking for a long-term relationship — and a soul mate. Musk even asked interviewer Neil Strauss if there was anyone Strauss thought he should date.

"If I'm not in love, if I'm not with a long-term companion, I cannot be happy," he told Rolling Stone. "I will never be happy without having someone. Going to sleep alone kills me. It's not like I don't know what that feels like: Being in a big empty house, and the footsteps echoing through the hallway, no one there – and no one on the pillow next to you. F--. How do you make yourself happy in a situation like that?"

Here's a look at some of the tech titan's past relationships:

SEE ALSO: A look inside the marriage of world's richest couple, Jeff and MacKenzie Bezos — who met at work, were engaged in 3 months, and own more land than almost anyone else in America

DON'T MISS: A look at the demanding schedule of Elon Musk, who works in 5-minute slots, skips breakfast, and largely avoids emails

Musk told Rolling Stone he's struggled with loneliness since childhood. "When I was a child, there's one thing I said," Musk said. "'I never want to be alone.'"

Source: Rolling Stone, Business Insider

Musk met his first wife, Justine Wilson, at Queen's University in Ontario. Writing in Marie Claire, Justine — who uses Musk's last name — recalled Musk invited her out for ice cream.

Source: Marie Claire

She decided to stay in to study, but he showed up with "two chocolate-chip ice cream cones dripping down his hands." Musk transferred to Wharton, but kept sending Justine roses. They went their separate ways, but reconnected as Musk started working on his first startup and Justine started working on her first novel after graduation.

Source: Marie Claire

• SpaceX successfully launched its Falcon Heavy rocket into space. 
• So far, everything has gone according to plan: two of the three boosters have landed back in Cape Canaveral, Florida, and Elon Musk's Tesla Roadster is headed toward Mars orbit.
  
• Here are some of the best photos and moments from the launch. 

We have liftoff. 

SpaceX launched its Falcon Heavy rocket — the company's biggest yet — into space on Tuesday. 

Falcon Heavy left the Kennedy Space Center in Cape Canaveral, Florida at 3:45 p.m. ET after some initial delays. The rocket is carrying Elon Musk's own midnight-cherry red Tesla Roadster out to Mars orbit, though its uppermost stage now has to coast through intense radiation fields around Earth's magnetic Van Allen belt.

The successful liftoff of Falcon Heavy could disrupt the launch industry, since the system's 134-foot-tall boosters can land themselves to be reused in future launches. Other rocket boosters on the market today are discarded after launch.

The event was a huge win for Musk and the future of private space exploration. Take a look at the highlights:

SEE ALSO: SpaceX's 'monster' Falcon Heavy rocket is set to launch this week — but Elon Musk has said there's a good chance it could blow up

Amid cheers from SpaceX employees on the livestream, the rocket took off on a pillar of smoke.

The Falcon Heavy is propelled by 27 engines contained in three boosters — two on the sides, and one in the center under the payload.

The three boosters gave the rocket a lot of power — they're capable of generating more than 5 million pounds of thrust.

• The acid in apple cider vinegar (ACV) can be dangerous to your mouth, teeth, and esophagus.
• Excessive ACV consumption can cause serious negative health effects.
• Science says that ACV alone will not help you lose any significant amount of weight.
• Some research suggests that ACV can help control blood sugar — but that same effect can be bad news if you have type 1 diabetes.
• Preliminary research suggests that carefully diluted ACV consumption may help lower cholesterol.

You've heard about the great things that apple cider vinegar (ACV) can do for your beauty routine.

Some even claim a shot of the stuff every morning can help suppress appetite and aide with weight loss.

With countless articles and books coming out all the time that tout the amazing health benefits of ACV, here's some science to help you decide if you want to integrate it into your daily routine.

Beneficial or not, apple cider vinegar is still an acid, and it can be rough on your insides.

I'll never forget the time I ate way too much pineapple, causing the inside of my mouth to feel  like I'd put it through a paper shredder. Thanks, natural acids.

It turns out that drinking straight, undiluted ACV is similarly dangerous to your insides — from your mouth on down.

"Never drink vinegar straight. It is a potent acid that can be dangerous if aspirated, may cause burns to the tender tissue of the mouth and esophagus, and can lead to tooth erosion," registered dietitian and Food Network personality Ellie Krieger wrote for the Washington Post.

Krieger isn't alone in warning about the potential health risks of too much ACV.

"One of the big downsides of ACV is that it may cause nausea and other gastrointestinal symptoms, so if you already have [a] sensitive tummy, it may not be for you," registered dietitian Abbey Sharp told Global News.

Of course, that isn't to say you should avoid ACV altogether. It's just not a good idea to make sure you're consuming it in a way that's safe for your body.

Excessive ACV consumption may reduce potassium levels and cause bone loss.

Registered dietitian and certified diabetes educator Franziska Spritzler drew my attention to this case of an otherwise healthy 28-year-old woman who developed both low potassium and osteoporosis. Doctors treating her credited both to the patient's over-the-top ACV habit.

Over the course of six years, the patient drank 8 ounces (250 ml) of ACV per day, both diluted in water and mixed into homemade salad dressing recipes.

Doctors believed that this unusually high level of ACV consumption was responsible for what Spritzler called "minerals being leached from her bones to buffer the acidity of her blood." This story is a single case, but it's still a good cautionary tale.

In most healthy people, the Mayo Clinic says it's rare to see serious symptoms due to  low potassium. However, abnormal heart rhythms (arrhythmias) are definite signs you should see your doctor — particularly if you've previously been diagnosed with heart disease.

ACV can also interact negatively with certain doctor-prescribed medications.

If you take insulin, digoxin (lanoxin), or certain diuretic drugs, ACV can amplify the potassium-lowering effects those medications already have, Spritzler warns.

• SpaceX CEO Elon Musk is a notorious workaholic, and his employees often work long hours.
• Musk encourages employees with free food and an in-house massage therapist.
• Musk has also rented out an entire movie theater for employees to see "The Martian."

Elon Musk, the founder and CEO of SpaceX, is a notorious workaholic.

During high periods of stress, he's been known to sleep on the floor of his factory so he can work nearly around the clock, and he hates having his time wasted with unnecessary meetings.

But many people still want to work for him at SpaceX.

Part of that might be related to the perks Musk offers his employees. Josh Boehm, who worked at SpaceX, recently shared on Quora how Musk encouraged employees to put up with long hours when he was an employee there.

SEE ALSO: Elon Musk doesn't have a desk at the office and has slept on the floor of his factories

The office perks start out relatively simple — Musk provides free dinners, coffee, and froyo.

Despite requiring a lot from employees, Musk takes the time to send encouraging emails and deliver speeches to employees.

The next perk, an in-house massage therapist, is a little more lavish and probably helps with the stress of working long hours.

• The New York Police Department spent decades infiltrating political organizations and spying on politically active New Yorkers.
• While surveillance continues in some form today, a public exhibit at the New York City Municipal Archives showcases what police spying looked like in the 1960s and '70s during one of the most turbulent political periods in modern US history.
• But few New Yorkers know about this vast collection of surveillance materials.
• Business Insider dug through the archives to discover the scope of NYPD spying — and to see what they found.

In the dank quarters of a courthouse just a block away from City Hall in lower Manhattan, dozens of brown boxes of declassified surveillance records — compiled over the course of decades by undercover police detectives — remain largely un-examined, never before seen by the public.

The records include a mix of internal police reports and memos, photos, newspaper clippings, event fliers, political campaign buttons, and posters.

They are available for anyone to view. You just have to ask.

In September, the New York City Municipal Archives launched an unprecedented exhibit showcasing NYPD surveillance materials from 1960 to 1975, one of the most turbulent political periods in modern American history.

The exhibit, "Unlikely Historians: Materials Collected by NYPD Surveillance Teams", gives visitors a small taste of just how far NYPD detectives went to infiltrate political organizations and investigate people they considered a threat.

But it ultimately represents just a fraction of the overall collection. Of the 520 boxes of NYPD surveillance materials in their possession, archivists at the Department of Records have only reviewed and catalogued about a quarter of them. The un-reviewed materials are temporarily stored at their office in Brooklyn.

"We're just starting to get the word out," Rossy Mendez, the collection's lead archivist, told Business Insider. "So people don't really know it exists."

We visited the archives to see for ourselves:

SEE ALSO: Civil Rights Lawyers Say The NYPD Is Watching Everything Muslims Do

DON'T MISS: The Berlin Wall has officially been gone for as long as it stood — here's how the 27-mile blockade looks today compared to 1989

The New York City Municipal Archives, which maintains the city's historical records, is located at Surrogate's Court in lower Manhattan.

In a storage room in the building's basement, records and old video reels are meticulously organized.

The NYC Municipal Archives has a vast collection of materials, including records dating back to the colonial era. But in 2015, the department received one of its most politically divisive collections yet.

Source: New York City Department of Records & Information Services

• Elon Musk splits much of his time between SpaceX and Tesla.

• He is the CEO of both companies.

• He plans every minute of his day, and often works through meals.

Elon Musk is one busy guy.

The Tesla and SpaceX founder generally spends a full workweek at each of his two companies, wolfing down lunch in five minutes and skipping phone calls for productivity's sake.

So it's not surprising that his daily life is pretty jam-packed.

Based on previous interviews, Business Insider pieced together an estimation of what an average day looks like for this real-life Tony Stark.

Take a look at a day in the life of Elon Musk:

SEE ALSO: Vladimir Putin's hard-core daily routine includes hours of swimming, late nights, and no alcohol

Musk kicks off his day bright and early, rising at about 7 a.m. In a Reddit AMA, he said he usually got six hours of shut-eye.

Source: Entrepreneur, Business Insider

Musk usually skips breakfast. Occasionally, he will slow down long enough to grab a quick coffee and an omelette.

Source: Auto Bild

One thing he always makes time for, no matter what? Showering. He once told Reddit it was his most important daily habit.

Source: Business Insider

Gangneung, South Korea

If this were a race, Gangneung would be the runaway winner. No surprise given that many of the events — including ice hockey, figure skating, and curling — for the 2018 Olympic Winter Games will be held there. But there's plenty to explore beyond the sporting arena year-round — namely beautiful beaches and specialty museums, from Ojukheon to Haslla Art World. Love having your finger on the pulse of what's trending in travel? You won't want to miss the hottest international hotel openings for 2018.

Bournemouth, United Kingdom

Edmonton, Canada

More than just Alberta's capital, Edmonton is an urban gateway to outdoor adventure. Its contemporary attractions — such as the Royal Alberta Museum, Muttart Conservatory, and the sprawling West Edmonton Mall, an 800-store shopping complex, complete with an indoor roller coaster and water park — coupled with its proximity to the rugged allure of Elk Island National Park and the Canadian Rockies make it a top pick for city-slickers and outdoor-lovers alike. No wonder Edmonton is on the list of 2018's must-see places.

• SpaceX interns work 80 hours per week and help the company launch rockets and improve its dynamics.
• So the aerospace company, recently rated one of the best places to work, asks some tough interview questions to ensure that it is hiring the right people.
• Questions mainly explored the realms of physics and quantum mechanics at an extremely advanced level

Forget about fetching coffee. As an intern at SpaceX — voted one of the best companies to work for— you'll help design, build, and launch rockets that could potentially take humans to Mars.

So it follows that you're going to have to answer some tough interview questions to get the gig.

Each year, more than 700 interns join SpaceX headquarters in Hawthorne, California, for 80-hour workweeks at about $22 an hour in departments like avionics, dynamics, launch operations, manufacturing, and enterprise information systems.

The hiring process typically consists of two in-depth phone interviews, during which intern candidates have to answer questions like the following, which we found on Glassdoor:

SEE ALSO: 21 tough interview questions you may have to answer if you want to work at Amazon

DON'T MISS: The 50 best places to work in 2018, according to employees

'What are composites?'

'What is the size of an integer on a 32-bit system?'

'Let's say you have a variable 'var' assigned to be '2'. What will display if you print 'var++'? If you print '++var' on the next line, what will be displayed? What is the final value of 'var'?'

Celebrities Britney Spears, Scarlett Johansson, and Jennifer Lopez are all fans of one type of training that is taking the health and wellness world by storm — HIIT. Even trainers like Jillian Michaels and celebrity trainer Jorge Cruise have both previously told INSIDER they are fans of the fat burning workout.

Eric Salvador, head trainer at Fhitting Room — a 50 minute HIIT class in New York City — told INSIDER that HIIT stands for high-intensity interval training, and is essentially the opposite of a long and steady workout.

"HIIT incorporates short bursts of workouts which will make you feel very uncomfortable implemented with some active recovery or rest for different kind of variations of time, so the ratio of work to rest is something that we play with," he said.

According to Salvador, HIIT is beneficial because it works the full body and tests both strength and endurance using compound movements.

With those benefits in mind, Salvador noted that some people could sabotage their HIIT workouts by making common mistakes. Here's what you might be doing wrong with HIIT and how to make the most out of your training.

SEE ALSO: I tried the science-backed 7-minute routine that was one of 2017's hottest workouts, and it actually works

You're making the workout too long.

One of the perks of HIIT workouts is that they are short. Adding more time won't make them more efficient.

Salvador said HIIT work varies from four to six minutes of "going all out" and then resting. Longer HIIT workouts, however, are one of the first mistakes he often sees with people trying out HIIT for the first time.

"Long workouts [...] they are not HIIT," he said. "You can't do a HIIT workout for a very long time. Some of the HIIT workouts I have done lasted 10 minutes, with rest involved, so the actual amount of work I am doing is different." 

Salvador added that some workouts are promoted as HIIT when they aren't. The way to determine if you are actually doing HIIT is if there are changes or intervals of intensity.

You skip your warm up.

You should never skip your warm up no matter the exercise, but it is especially important to warm up for a HIIT session. According to Salvador, the shorter the workout, the longer you have to warm up since you are taking your body from one extreme to another.

"If I have a really long workout I don't have to warm up as much because then in that long workout I start to warm up within the first five minutes," he said.

"So warm-ups are very important, and what I mean by that is getting the body moving, getting a little sweat involved, before you hit something that is really intense to prevent that heart [rate] spike right off the bat."

You're just resting during your average workout, and not upping the intensity.

For HIIT to be effective, you have to implement both the high-intensity work and intervals. So if you are simply adding breaks or rests into your typical workout without upping the intensity, you aren't doing HIIT, according to Salvador.

"Once you start losing the intensity basically you are just working out and resting for 30 seconds which is not very intense, and now your workout starts to diminish," Salvador said.

One example he gave was if someone did a HIIT workout and rested as necessary but didn't really sweat or feel challenged, that points to a mistake in intensity. Some people, according to Salvador, don't know how to measure intensity.

On a scale of one to 10, one would be sleeping, and a 10 would be feeling like you couldn't possibly do any more work. For HIIT, you should be in the eight to 10 range, according to Salvador. If you stay in the lower levels, you aren't really challenging your body or getting the most out of your workout.

To make an exercise more intense, Salvador recommended changes like turning a normal step up on a box to a box jump or turning a dumbbell curl into a dumbbell curl and squat. Changing up these moves will make your body work more, tax more muscles, and burn more calories.

For those of us with office jobs, breakfast may not be such a big deal. Maybe you grab a granola bar and a piece of fruit, or maybe you stick with black coffee.

But for athletes competing in this year's Winter Olympics, breakfast is a chance to prepare their bodies to perform incredible feats.

We scoured the web to see what some of the biggest stars of the upcoming games have shared about their breakfast routines. One has a personal chef who prepares a veggie omelet for her; another feasts on chocolate pancakes. Read to on to find out how athletes will be fueling up when the Winter Olympics start Friday.

SEE ALSO: How 22-year-old American Olympian Mikaela Shiffrin, called 'the next Lindsey Vonn,' became the world's best slalom skier

Alpine skier Mikaela Shiffrin eats two eggs, two pieces of whole-wheat toast, and sometimes cereal or oatmeal and fruit. It's part of her 3,000-calorie daily meal plan.

Source: Good Housekeeping

Snowboarder Chloe Kim downs chocolate pancakes, biscuits and gravy, toast, and cottage cheese. "I don't have a crazy diet," she told PopSugar.

Source: PopSugar

Alpine skier Marcel Hirscher eats "lots of banana, mango, ham, and spelt bread"— and drinks coffee. He said he tries to avoid cow's milk, eggs, and wheat.

Source: Outside

True crime TV shows aren't new, but that hasn't stopped different shows like "Mindhunter" and "Unsolved: The Murders of Tupac and the Notorious B.I.G." from coming to the small screen. These shows aren't always historically accurate, but many use real-life stories as inspiration. And although some people like theorizing "whodunnit," in real life, there isn't always justice at the end of it all.

These nine famous crimes are all unsolved — but that doesn't stop historians, police, and the public from coming up with their own theories as to who was responsible.

Here are some of the most famous unsolved crimes in history.

Jack the Ripper murders

In London's Whitechapel district, five female sex workers were murdered more than 130 years ago. The killer slashed the victims and even removed some organs, thus nicknaming the unidentified murderer as "Jack the Ripper." The case was closed in 1892. That hasn't stopped people from suspecting everyone from Sir John Williams, Queen Victoria's royal surgeon, to his wife, Lizzie Williams.

English historian John Morris explored the Williams theory, and others, in his book "Jack the Ripper: The Hand of a Woman." According to the Huffington Post, some people believe Lizzie Williams was Jill the Ripper since the reproductive organs of the victims were torn out — and Lizzie was infertile. Other suspects included Lord Randolph Churchill and author Lewis Carroll.

The Black Dahlia murder case

Aspiring actress Elizabeth Short, nicknamed "The Black Dahlia" after her death, was just 22-years-old when she was found dead in Los Angeles in 1947. The murder case was sensationalized in the media because Short was part of the Hollywood circuit and Short's body was drained of blood with cuts on the sides of her mouth reminiscent of a clown.

Although confessions poured in for the murder, the police didn't file charges — and the case is still open today. According to Fox News, Piu Eatwell — a British lawyer and author of "Black Dahlia, Red Rose"— believes one of Short's ex-boyfriends, Leslie Dillon, was her killer. Dillon was a former mortician's assistant and an aspiring writer.

Meanwhile, a retired police detective thinks that his deceased father Dr. George Hodel was actually the killer. USA Today reported that Dr. Hodel was initially a person of interest in the case, although police didn't arrest him. The doctor's house where he allegedly murdered Short was sold for £3.5 million — around $4.2 million at today's conversion rates — in February 2018, according to The Sun.

Art Heist at the Gardner Museum

In March of 1990, 13 pieces of art were stolen from Boston's Isabella Stewart Gardner Museum. According to NPR, men disguised as policemen tied up two night guards at the museum before taking off with the works of Flinck, Manet, and Degas, among others.

In 2015, the FBI claimed they identified the thieves as two local mobsters who died shortly after the heist, according to the Boston Globe. They refused to name the men, however, and are still looking for the unrecovered works today. The Boston Globe also reported that the FBI believes the artwork circulated around Philadelphia through organized crime families.  

If you're in the market for a high-end, great-sounding smart speaker, you have a tough choice to make: Apple's HomePod, or Google's Home Max?

Both speakers offer incredible sound, built-in smart assistants, and the power of two tech behemoths behind them. They even have a similar price, at $350 for the HomePod and $400 for the Max.

But Google Home Max has several crucial advantages over the HomePod that that make it a smarter buy than Apple's new offering.

SEE ALSO: Apple's new $350 HomePod speaker sounds great — but there are 7 crucial things it can't do

1. Google Home Max has the powerful Google Assistant built in.

Google Home Max has Google Assistant, Google's powerful smart assistant that's also in its Pixel phones and other Google Home devices. It can do things like look up recipes, answer trivia questions, or tell you jokes.

HomePod has Siri, Apple's digital assistant. But Siri on HomePod is not the same as Siri on the iPhone — its abilities are limited, so it can't do things like look something up on the internet or call someone for you.

And Siri, in general, is nowhere near as flexible or as comprehensive as Google Assistant when it comes to connecting to your various smart-home devices and answering questions.

2. Google Home Max supports multiple users.

Google Home Max can recognize voices and supports multiple users, which is helpful for both personalization (it knows who is asking for what) and privacy.

By contrast, HomePod can't recognize voices. So for example, anyone in your house could say, "Hey Siri, read my most recent text," and it would read aloud from the device it's paired with.

3. Google Home Max can do stereo-pairing right out of the box.

If you buy two Google Home Max devices, they can wirelessly pair to create a stereo experience. HomePod will eventually be able to do that too, but not for several months.

The 2018 Winter Olympics are starting on Thursday, February 8th in Pyeongchang, South Korea.

After the medals have been awarded and the athletes have all gone home until the next games, host cities are left with massive leftover stadiums and venues. After that, it's often hard to find a use for giant stadiums, pools, and courses.

Sometimes cities are able to successfully repurpose parts of their Olympic set-ups, but oftentimes these giant investments are torn down or abandoned.

Here are 30 photos that show what happened to recent Olympic sites after everyone left.

The 1984 Winter Olympics in Sarajevo, Yugoslavia, took place less than a decade before the Bosnian War.

The city was under siege, and though it's largely recovered in the years since it ended, many Olympic sites, like this ski jump, have been left to the elements.

Kosovo Stadium, where the opening ceremony was held, belongs to the dogs now.

On February 8, the 2018 Winter Olympics will kick off in Pyeongchang, South Korea. The country has devoted over $1 billion toward building gleaming new stadiums and slopes.

For Olympic host cities, this kind of major investment is not unusual. But after the world’s TV sets tune out, some of these cities do not have the infrastructure for upkeep of the venues. In the case of Sarajevo, Bosnia, some Olympic sites were torn apart by war.

Sarajevo hosted the 1984 Winter Olympics, but a decade later, terrible conflict ravaged much of the city and killed thousands of civilians.

Today, many of the former venues lie in ruin.

SEE ALSO: South Korea spent over $1 billion on these mega-venues for the 2018 Winter Olympics — take a look

On February 8, 1984, athletes from 49 nations flocked to Sarajevo for the Winter Olympics. The opening ceremony featured an impressive set-up.

It was the first communist state to hold a winter games.

Source: Reuters

But from 1992 to 1995, amidst the breakup of the former Yugoslavia, the majority of Olympic venues were abandoned.

• With our current economy and life expectancy, most people should wait until the age of 70 to retire.
• While it means you work longer, it also allows more time to save the amount of money you'll need to live comfortably in retirement. 
• To help you reach your retirement financial goals, there are some books you can read. 
• These include "Your Retirement Quest" by Alan Spector and Keith Lawrence, and "The Longevity Economy" by Joseph Coughlin.

You might be able to start collecting Social Security at 62, but personal finance expert Suze Orman says it's a mistake to think this is the right age for most people to retire. Given today's economic reality and the longer lifespans many of us can expect to enjoy, most Americans should wait until the age of 70 to retire, she says. (A new study from the Stanford Longevity Center came to a similar conclusion.)

On one hand, that's kind of a bummer, especially for older workers dreaming of ditching the daily grind. But there is one great silver lining to stretching out your career: That additional time in the workforce gives you a lot more income-generating years to plan for your retirement.

With that in mind, here are some of the top retirement-planning books, according to expert sources and staffers at MONEY. This roundup ranges the gamut from big-picture economic questions to the nitty-gritty of your personal assets. (And if you can't get enough of retirement planning information after checking out these titles, have a look at Amazon's list of bestselling retirement books.)

SEE ALSO: The rich are much richer than many of us realize, and it's a result of the way we measure wealth

'Your Retirement Quest: 10 Secrets for Creating and Living a Fulfilling Retirement' by Alan Spector and Keith Lawrence

As the saying goes, it’s not the years in your life — it’s the life in your years. We learn in our careers how important it is to have work-life balance, and the authors here apply that same principle to retirement planning. This comprehensive book melds a big-picture sensibility of post-career life with pertinent research studies and insights and interviews from real retirees. While the focus is financial security, the book approaches that goal in the context of what’s truly important in life.

'The Mindset Retirement: How I Retired at 55 —With No Money' by Beth Rand

Although not a conventional retirement planning guide — Rand readily admits in her foreword that she is not a financial expert — this independently-published book is still valuable as a resource "from the trenches" of post-recession financial disarray. It confronts the complex emotions people can face around retirement, especially if that prospect suddenly looks a lot further away than you once imagined.

'Pensionless: The 10-Step Solution for a Stress-Free Retirement' by Emily Brandon

Given that fewer than one in eight American workers in the private sector have access to a traditional defined-benefit pension, this strategy-heavy book is sure to help a wide swath of the population prepare for and ensure their financial security. It offers a step-by-step guide for maximizing the benefits you do have and avoiding pitfalls. Brandon covers Medicare, Social Security, employer-sponsored retirement plans, and more to give readers a complete picture of how to manage their post-career finances.

• Mothers of teenage shoppers are furious about the risqué photos in Victoria's Secret stores and say they are inappropriate for young girls shopping the company's PINK line. 
• A customer shared photos of a Victoria's Secret store in the Columbiana Centre Mall in South Carolina.
• Oversexualized ads like those in the photos could threaten Victoria's Secret's teen apparel business, which has been a bright spot for the retailer.

Victoria's Secret is ostracizing some customers with its risqué ads. 

"It's basically pornography," shopper Jessie Shealy wrote on Victoria's Secret's Facebook page, referring to the ads on display in her local store in South Carolina. Shealy has teenage daughters who shop from Victoria's Secret's PINK apparel brand, which is targeted toward younger consumers. She told Business Insider she has called and emailed Victoria's Secret and her local mall, Columbiana Centre, to complain about the images she's seen in the store. 

Shealy's biggest complaint is that her store doesn't have a divide between PINK and Victoria's Secret's racy lingerie collection. This means that younger PINK shoppers are subjected to some of the more risqué imagery while they're shopping.

"I've not been happy with the displays for a while but when the models are spread leg, pulling down panties and even bare bottom women on the walls ... it is VERY embarrassing for a family," she wrote on Facebook.

These displays don't seem to be consistent in all of Victoria's Secret's stores. We visited a store in Manhattan and found that it did have two distinct sections for each brand, with separate checkout areas. 

Victoria's Secret did not immediately respond to Business Insider's request for comment. 

The ads are in danger of damaging PINK by putting off its shoppers. This is especially concerning as PINK has become one of the most successful parts of the company, reporting stronger sales than the other parts of the store in recent years. During the third quarter of 2017, total sales at PINK increased in the mid-single-digit range while sales in its beauty and lingerie sections were down, the company said in its earnings call.

Shealy shared photos from her local Victoria's Secret store with Business Insider. 

Editor's Note: Some of these photos might not be considered safe for work. 

SEE ALSO: Teen retail's hottest lingerie brand is supercharging its biggest weapon against Victoria's Secret

This image hangs directly behind the checkout area at the store. Shealy described the images as "obscene."

Shealy has reached out to the company to request separate checkout areas for PINK and Victoria's Secret shoppers.

Victoria's Secret has been called out for its oversexualized ads in the past. Another shopper wrote on Facebook: "The sexualization of girls has gotten worse and worse over the years."

• Likability isn't necessarily inherent.

• You can practice certain behaviors in order to appear — and become — more likable.

• Practices range from smiling more to honing your listening skills.

Being likable is entirely under your control.

All it takes is the ability to pick up a few key social skills that build emotional intelligence.

To help you out, we sifted through the Quora thread "What are useful social skills that can be picked up quickly?," talked to an etiquette expert, and looked to some social psychology researchers.

Here are 19 simple ways to start crafting a "million-dollar personality" and become the most likable person in the room:

DON'T MISS: 16 skills that are hard to learn but will pay off forever

SEE ALSO: 15 hobbies highly successful people practice in their spare time

Keep eye contact

As Heidi Grant Halvorson explains in her book "No One Understands You And What To Do About It," the very first thing people will try to decide about you when they meet you is if they can trust you — and it's fairly hard to like someone if you don't trust them.

Their decision is made almost entirely unconsciously, and it usually comes down to how well you can balance conveying two things: warmth and competence.

"Above all else, really focus on what is being said to you — people need to feel that they have been heard, even when you can't give them what they are asking for or can't be of particular help," Halvorson writes. One simple way to show you're paying attention is to make eye contact and hold it.

"It is an idiotically simple thing, but it remains one of the most impactful life hacks around,"writes Quora user Brad Porter.

Halvorson says that making eye contact is also an effective way to convey competence, and studies have shown that those who do so are consistently judged as more intelligent.

Start this habit immediately, says Porter. It requires no practice or special skill — just the commitment to meet someone's gaze and look them in the eye while conversing.

Smile

Don't underestimate the power of smiling, another simple and effective way to convey warmth.

Additionally, laugh and tell jokes, recommends Quora user Craig Fraser. People unconsciously mirror the body language of the person they're talking to. If you want to be likable, use positive body language and people will naturally return the favor.

Show enthusiasm

"Along with a smile, show some enthusiasm and energy, also known as charisma," suggests Rosalinda Oropeza Randall, an etiquette and civility expert and the author of "Don't Burp in the Boardroom.

"This not only draws people to you, but it is contagious," she says. "After spending time with you, people will walk away with a warm and fuzzy feeling, which most likely, they'll pass on to someone else."

The Insider Picks team writes about stuff we think you'll like. Business Insider has affiliate partnerships, so we get a share of the revenue from your purchase.

The Insider Pick:

• Whether you’re new to the exfoliation game or a seasoned skincare pro, Glossier’s Solution is the exfoliator you should be reaching for. Its powerful mix of acids dissolves dead skin cells and improves your complexion, giving your face a gorgeous glow.

A good exfoliant is like a magic bullet for any skincare routine because it truly helps just about anything that’s ailing your face. Regular exfoliation sloughs off dead skin cells, revealing brighter, more refreshed skin underneath. It also helps to keep your pores clear, which means acne-prone folks will experience fewer breakouts, and the rest of your skincare routine has a clear path to penetrate your epidermis. Oh, and did I mention it helps your makeup sit better on your face?

That said, the idea of exfoliating can be scary to a lot of people. Thanks to environmentally-unfriendly microbeads and the harsh apricot scrubs of our youths, exfoliants have a reputation for being abrasive, coarse, and the kind of product that can leave your skin harsh and inflamed. But the latest crop of exfoliants are nothing like this. These guys are gentle, smoothing, and brightening.

So where do you even start when incorporating an exfoliant into your routine? The first thing to consider is your skin type because every face needs something a little different from their scrub. It’s also important to keep in mind that there are, in fact, two different kinds of exfoliants — physical and chemical.

Physical exfoliants are pretty straightforward and the more traditional of the two. The good ones tend to use small grains to slough off dead skin. In fact, you want to stay away from any physical exfoliant that uses large, jagged pieces to scrub in order to avoid micro-tears in the skin.

Chemical exfoliants, on the other hand, use — wait for it — chemicals to dissolve dead skin cells. But don’t let the word “chemical” scare you. Since these exfoliants don’t involve scrubbing, they tend to be a lot gentler on the skin than physical exfoliants. The most common chemical exfoliants are alpha hydroxy acids (AHAs), beta hydroxy acids (BHAs), and fruit enzymes.

But even with all of that knowledge, it’s important to note that not all exfoliants are created equal. So in order to determine which exfoliants are worth your time and hard-earned cash, I’ve tested a handful of some of the top-rated exfoliants you can buy. Regardless of your skin type, your desired outcome, or your budget, there is absolutely an exfoliant out there that is going to make your skin glow. That is a promise.

Read on in the slides below to learn why the Glossier Solution is our top pick and why you might also like the Simple Kind to Skin Smoothing Facial Scrub, the Dermalogical Daily Microfoliant, the Juara Radiance Enzyme Scrub, and the Ole Henriksen Transforming Walnut Scrub.

SEE ALSO: The best hairbrushes you can buy

The best exfoliator overall

Why you'll love it: Glossier’s Solution uses both AHAs and BHAs to help dissolve dead skin cells, giving your face a beautiful glow for just $24.

While most people see a lot of internet buzz around a product as a reason to buy it, I tend to be a little wary about products that are instantly Instagram-famous. So I went into my testing phase of Glossier Solution as a total cynic. Could this stuff really be as great as my favorite beauty editors and influencers say it was?

After three weeks of testing, I’m happy to say that the answer is a resounding hell yes. I’ve been using the Glossier Solution every evening, immediately after cleansing and right before spritzing on my favorite toner, and honestly, it looks like I have a different face. My complexion is clearer, my skin is smoother, and I recently went on a date with no foundation or concealer on. That’s how altering this stuff is.

What makes Solution a game-changer is its powerful (yet surprisingly gentle) combination of acids. It uses the AHAs lactic and glycolic acid to exfoliate the skin’s surface, while harnessing the BHA glycolic acid to penetrate the skin’s surface, clearing out all the gunk from your pores. This one-two punch means you’re getting the deepest exfoliation you possibly can.

The bottle is also formulated with a polyhydroxy acid (PHA) called gluconolactone, which balances out the first two acids, meaning this formula is clutch for all skin types — including sensitive ones.

When you first swipe Solution on, you’ll feel a slight tingle, but there’s no need to panic. That’s just the feeling of a chemical exfoliant doing its job. While you won’t see results immediately, the beauty of all these acids working together is that the results compound on one another, eventually revealing a complexion so gorgeous, you’ll wonder how you ever lived without it.

Refinery29 editor Rachel Kraus also gave the Glossier Solution high marks, saying it changed her skin. Reviewers at PopSugar and InStyle also had great experiences.

After nearly a month of using this exfoliator, I doubt I’ll ever go back to my other exfoliants. Glossier's Solution stands head and shoulders over all of the others I’ve tried, which is why it’s snagged the top spot for me.

Pros: Super gentle, wallet-friendly, and easy-to-use, making it perfect for both beginners and skin care pros

Cons: These acids may make your skin more photosensitive, so it’s important to incorporate a daily sunscreen into your routine

Buy the Glossier Solution for $24

The best drugstore exfoliator

Why you'll love it: If you’re looking for powerful, fragrance-free exfoliation on a budget, then Simple Kind to Skin Smoothing Facial Scrub is the way to go.

One of the hardest parts about shopping for skin care is the high prices, and while I am always an advocate for investing in the products you put on your face, sometimes you just need a budget-friendly option. Enter: Simple Skin Care. The brand’s entire line is effective, gentle, and also wallet-friendly, making it a drugstore standby even the most seasoned beauty editors swear by.

But don’t let the price point lead to you believe this product doesn’t do its job. This gentle scrub both exfoliates and moisturizes, making it clutch for folks with combination skin. It’s a physical exfoliant and uses natural rice granules to slough off dead skin cells.

While it won’t penetrate your skin to clear out your pores, removing the dead cells from the upper layer of your dermis will actually give your pores the appearance of being smaller. And who doesn’t want that?

The key to using a physical exfoliant like Simple’s is to be gentle. Don’t feel like you have to harshly scrub at your face in order to get a good clean. Wet your face, lather up, and then gently massage the product into your skin in small circles. Simple’s formula is also fragrance-free, which makes it extra gentle.

Simple’s exfoliant holds a four-star rating on Target, where one user wrote that, unlike other scrubs, this product neither causes breakouts nor dries her skin out. Other users have commented that this scrub is so gentle that they feel comfortable enough using it every day — an accolade not many other exfoliants can boast.

If gentle exfoliation at a reasonable price point sounds good for you, look no further than Simple’s Kind to Skin Smoothing Scrub.

Pros: Super gentle, uses natural products to exfoliate, fragrance-free, and won’t bust your budget

Cons: Folks with extra-sensitive skin might experience irritation from the rice granules in this scrub

Buy Simple Kind to Skin Smoothing Facial Scrub from Walmart for $4.98

The best exfoliator for daily use

Why you'll love it: Dermalogica’s Daily Microfoliant is a powder that transforms into an exfoliating paste, so it’s incredibly gentle and perfect for people who want to scrub daily.

Because of the nature of your skin’s regular cycle, daily exfoliation isn’t really necessary for those of you whose skin tends to be on the dry side. Most people can get away with a scrub every other day. But folks with normal-to-oily skin may like the idea of incorporating a regular physical exfoliant into their routines in order to keep their pores clear of the gunk that can cause breakouts.

That’s where Dermalogica’s Daily Microfoliant comes in. It uses a mix of both physical and chemical exfoliants to resurface your skin, leaving behind a surface so smooth, you won’t believe how well your foundation will sit on it. Microfoliant uses rice bran to scrub up the surface of the skin, while salicylic acid and papain enzymes penetrate the surface to chisel out all the gunk hanging out in your pores. This one-two punch ensures you’re getting the full range of exfoliation benefits.

Microfoliant starts out as a powder to which you add water to create a paste. Since you are in control of the amount of H20 you add, you’re also in control of how gritty the exfoliant is. Have more sensitive skin? Add a lot of water. Feel like you can handle a little more physical exfoliation? Pull back on the amount you add. This choose-your-own-adventure kind of cocktailing ensures you’re getting the right amount of scrub for your skin type.

This customization is what makes it such a winner amongst beauty experts, too. Glamour’s director of social media Madeline Haller says that she loves the texture of Microfoliant, and she’s not alone — Microfoliant has a 4.5-star rating on Amazon, Sephora, and Ulta. Talk about a crowd pleaser.

Pros: Gentle enough for daily use and customizable

Cons: Since it’s a powder, it can get a little messy

Buy Dermalogical Daily Microfoliant from Ulta for $55