Questões de Inglês do ENEM

Texto 3:

Born Too Soon in a Country at War. Their Only Hope? This Clinic. By Kassie Bracken and Megan Special August 27, 2018

The baby girl has stopped breathing. She was born prematurely and is only 3 weeks old. Her mother, Restina Boniface, took her to the only public neonatal clinic in South Sudan. The country is one of the toughest places in the world for newborns with health problems to survive. Ten feet away sits a donated respiratory machine that could save the baby. But lacking a critical part, it goes unused. The doctor tries to resuscitate the baby for several minutes. Finally, she begins breathing on her own. One in 10 babies brought to this clinic will die, most from treatable conditions. But many mothers have nowhere else to go.

South Sudan, the world’s youngest nation, is in the midst of a humanitarian crisis. A brutal civil war has drained the economy. As hospitals closed, doctors were forced to flee. Inside the clinic, many babies remain nameless. Their mothers know they may not make it. “Our mothers here, they come for help,” said Rose Tongan, a pediatrician. “And you pity them. You can’t do anything.” Electricity cuts out for days at a time. There is no formula for the premature babies, no lab for blood tests, no facility for X-rays. There are no beds for breast-feeding mothers. They must sleep outside, where they are at risk of infection and vulnerable to assault. “I feel like: What can I do?” Dr. Tongan said.

Hellen Sitima’s 3-day-old daughter is sick. “When we get home, then that’s the time to name the baby,” she says. Dr. Tongan has no access to lab tests, but she determines that Ms. Sitima’s baby has a respiratory infection. The infection clears, and Ms. Sitima takes her daughter home. She names her Gift.

Disponível em https://www.nytimes.com/interactive/2018/08/28/multimedia/ south-sudan-babies.html. Acessado em 22/10/2018

O texto relata a situação crítica em que se encontram hospitais no Sudão do Sul e de alguns pacientes que deles precisam para sobreviver. Assim sendo, assinale a alternativa que corresponde ao lido:

Texto 2:

Are LED lights making us ill?

By Lucy Jones

Over the last decade, much of Europe and the US have changed the way they illuminate city and town streets. They have replaced high-energy sodium bulbs (the warmer, yellow ones) with energy-saving LED bulbs (with a blue light emitting diode, which can feel harsh in comparison). As well as street lights, most of us are exposed to blue light through smartphones, computers, TVs, and in the home.

The World Journal of Biological Psychiatry published a paper that warned of the potential effects of LED lighting on mental illness. It raised concerns about the influence of blue light on sleep, other circadian-mediated symptoms, use of digital healthcare apps and devices, and the higher sensitivity of teenagers to blue light. Specifically, the researchers are concerned about the relationship between light exposure and the occurrence of manic and mixed symptoms in bipolar disorder, having adverse effects on manic states and the sleep-wake cycle. For example, the use of smartphones or computers by those people before bed could have a bad effect on their sleep, circadian rhythms and health.

Studies of the impact of blue light on healthy adults show it inhibits melatonin secretion which disrupts sleep and can affect quality of life, physical and mental health and susceptibility to illness.

Previous studies of sleep disorders in children and adolescents show a clear and consistent relationship between sleep disorders and frequency of digital device usage.

Currently, the National Sleep Foundation guidelines suggest not using technology 30 minutes before bed and removing technology for the bedroom. However, there are currently no specific guidelines for people with an underlying mental illness or sensitivity to circadian disruption.

As LED technology has rapidly spread across the globe, the focus has been on the visual element and the energysaving element. Now, scientists, health professionals and the LED industry are working to minimise the blue light in LEDs and create customisable lights that won’t harm those suffering from psychiatric disorders.

Disponível em https://www.bbcearth.com/blog/?article=are-led-lights-making-us-ill Acessado em 22/10/2018

A rápida substituição de lâmpadas comuns por lâmpadas de LED em todos os setores e locais tiveram duas razões principais: a visual e a economia de energia. Porém, importantes estudos estão investigando se há consequências deste uso para a saúde. Assim, de acordo com o texto, é possível dizer que:

Texto 1:

Accountant Job Application Cover Letter

To,

Bonn, Joseph

Regional Director

All Digital

102, Lake avenue

Torres, Paulo

Dated: 5th of May 2018 Subject: Application for the position of an accountant

Respected Mr. Bonn

This letter is in regards to the job advertisement posted by your organization in MMO magazine concerning to the requirement of a candidate in the position of an accountant for which I am interested and I would like to apply for. I have worked in similar position for five years and my last job was with Aspen Group where I used to prepare accounting statements for the organization, ensuring that balance sheet was tallied, compiling financial information and implementing accounting control procedures. I also had to ensure that accuracy is maintained in all statements and documents and solve any existing accounting discrepancy. I have excellent calculative skills and an eye for detail besides being good at preparing reports and statements. I can assure that my previous work experience is going to benefit your organization.

It would be great if we could meet for an interview round. My resume is enclosed.

Regards, Nataniel Lucas Disponível em https://www.dayjob.com/content/ accountant-cover-letter-example-350.htm. Acessado em 22/10/2018 (adaptado)

O gênero Carta é ainda um meio de comunicação muito usado, sobretudo no mundo do trabalho. Assim, leia a carta de Nataniel Lucas e identifique o tipo de carta e sua finalidade:

Leia o texto para responder às questões

Prescriptions for fighting epidemics 

    Epidemics have plagued humanity since the dawn of settled life. Yet, success in conquering them remains patchy. Experts predict that a global one that could kill more than 300 million people would come round in the next 20 to 40 years. What pathogen would cause it is anybody’s guess. Chances are that it will be a virus that lurks in birds or mammals, or one that that has not yet hatched. The scariest are both highly lethal and spread easily among humans. Thankfully, bugs that excel at the first tend to be weak at the other. But mutations – ordinary business for germs – can change that in a blink. Moreover, when humans get too close to beasts, either wild or packed in farms, an animal disease can become a human one.
    A front-runner for global pandemics is the seasonal influenza virus, which mutates so much that a vaccine must be custom-made every year. The Spanish flu pandemic of 1918, which killed 50 million to 100 million people, was a potent version of the “swine flu” that emerged in 2009. The H5N1 “avian flu” strain, deadly in 60% of cases, came about in the 1990s when a virus that sickened birds made the jump to a human. Ebola, HIV and Zika took a similar route.

                                                                                                     (www.economist.com, 08.02.2018. Adaptado.)

Leia o texto para responder às questões

Prescriptions for fighting epidemics 

    Epidemics have plagued humanity since the dawn of settled life. Yet, success in conquering them remains patchy. Experts predict that a global one that could kill more than 300 million people would come round in the next 20 to 40 years. What pathogen would cause it is anybody’s guess. Chances are that it will be a virus that lurks in birds or mammals, or one that that has not yet hatched. The scariest are both highly lethal and spread easily among humans. Thankfully, bugs that excel at the first tend to be weak at the other. But mutations – ordinary business for germs – can change that in a blink. Moreover, when humans get too close to beasts, either wild or packed in farms, an animal disease can become a human one.
    A front-runner for global pandemics is the seasonal influenza virus, which mutates so much that a vaccine must be custom-made every year. The Spanish flu pandemic of 1918, which killed 50 million to 100 million people, was a potent version of the “swine flu” that emerged in 2009. The H5N1 “avian flu” strain, deadly in 60% of cases, came about in the 1990s when a virus that sickened birds made the jump to a human. Ebola, HIV and Zika took a similar route.

                                                                                                     (www.economist.com, 08.02.2018. Adaptado.)

Leia o texto para responder às questões

Prescriptions for fighting epidemics 

    Epidemics have plagued humanity since the dawn of settled life. Yet, success in conquering them remains patchy. Experts predict that a global one that could kill more than 300 million people would come round in the next 20 to 40 years. What pathogen would cause it is anybody’s guess. Chances are that it will be a virus that lurks in birds or mammals, or one that that has not yet hatched. The scariest are both highly lethal and spread easily among humans. Thankfully, bugs that excel at the first tend to be weak at the other. But mutations – ordinary business for germs – can change that in a blink. Moreover, when humans get too close to beasts, either wild or packed in farms, an animal disease can become a human one.
    A front-runner for global pandemics is the seasonal influenza virus, which mutates so much that a vaccine must be custom-made every year. The Spanish flu pandemic of 1918, which killed 50 million to 100 million people, was a potent version of the “swine flu” that emerged in 2009. The H5N1 “avian flu” strain, deadly in 60% of cases, came about in the 1990s when a virus that sickened birds made the jump to a human. Ebola, HIV and Zika took a similar route.

                                                                                                     (www.economist.com, 08.02.2018. Adaptado.)

                   Fake news could ruin social media, but there’s still hope

by: Guðrun í Jákupsstovu

Camille Francois, director of research and analysis at Graphika, told the audience of her talk at TNW Conference:

“Disinformation campaigns, or fake news is a concept we’ve known about for years, but few people realize how varied the concept can be and how many forms it comes in. When the first instances of fake news started to surface, they were connected with bots. These flooded conversations with alternative stories in order to create noise and, in turn, silence what was actually being said”.

According to Francois, today’s disinformation campaigns are far more varied than just bots – and much harder to detect. For example, targeted harassment campaigns are carried out against journalists and human-rights activists who are critical of governments or big organizations.

“We see this kind of campaigns happening at large scale in countries like the Philippines, Turkey, Ecuador, and Venezuela. The point of these campaigns is to flood the narrative these people try to create with so much noise that their original message gets silenced, their reputation gets damaged, and their credibility undermined. I call this patriotic trolling.”

There are also examples of disinformation campaigns mobilizing people. This was evident during the US elections in 2016 when many fake events suddenly started popping up on Facebook. One Russian Facebook page “organized” an anti-Islam event, while another “organized” a pro-Islam demonstration. The two fake events gathered activists to the same street in Texas, leading to a stand-off.

Francois explains how amazed she is that, in spite of social media being the main medium for these different disinformation campaigns, actual people also still use it to protest properly.

If we look at countries, like Turkey – where there’s a huge amount of censorship and smear campaigns directed at human right defenders and journalists – citizens around the world and in those places still use social media to denounce corruption, to organize human rights movements and this proves that we still haven’t lost the battle of who owns social media.

This is an ongoing battle, and it lets us recognize the actors who are trying to remove the option for people to use social media for good. But everyday you still have people all over the world turning to social media to support their democratic activities. This gives me hope and a desire to protect people’s ability to use social media for good, for denouncing corruption and protecting human rights.

Adapted from:<https://thenextweb.com/socialmedia/2018/05/25/> . Access 09 Oct. 2018.

Glossary

bot: (short for "robot"): um programa automático que roda na Internet; to flood: inundar; trolling: fazer postagem deliberadamente ofensiva para provocar alguém; popping up: surgir, aparecer; stand-off: impasse: smear campaigns: campanhas de difamação.

                                         T E X T

                          Can you learn in your sleep?

      Sleep is known to be crucial for learning and memory formation. What's more, scientists have even managed to pick out specific memories and consolidate them during sleep. However, the exact mechanisms behind this were unknown — until now.

      Those among us who grew up with the popular cartoon "Dexter's Laboratory" might remember the famous episode wherein Dexter's trying to learn French overnight. He creates a device that helps him to learn in his sleep by playing French phrases to him. Of course, since the show is a comedy, Dexter's record gets stuck on the phrase "Omelette du fromage" and the next day he's incapable of saying anything else. This is, of course, a problem that puts him through a series of hilarious situations.

      The idea that we can learn in our sleep has captivated the minds of artists and scientists alike; the possibility that one day we could all drastically improve our productivity by learning in our sleep is very appealing. But could such a scenario ever become a reality?

      New research seems to suggest so, and scientists in general are moving closer to understanding precisely what goes on in the brain when we sleep and how the restful state affects learning and memory formation.

      For instance, previous studies have shown that non-rapid eye movement (non-REM) sleep — or dreamless sleep — is crucial for consolidating memories. It has also been shown that sleep spindles, or sudden spikes in oscillatory brain activity that can be seen on an electroencephalogram (EEG) during the second stage of non-REM sleep, are key for this memory consolidation. Scientists were also able to specifically target certain memories and reactivate, or strengthen, them by using auditory cues.

      However, the mechanism behind such achievements remained mysterious until now. Researchers were also unaware if such mechanisms would help with memorizing new information.

      Therefore, a team of researchers set out to investigate. Scott Cairney, from the University of York in the United Kingdom, co-led the research with Bernhard Staresina, who works at the University of Birmingham, also in the U.K. Their findings were published in the journal Current Biology.

      Cairney explains the motivation for the research, saying, "We are quite certain that memories are reactivated in the brain during sleep, but we don't know the neural processes that underpin this phenomenon." "Sleep spindles," he continues, "have been linked to the benefits of sleep for memory in previous research, so we wanted to investigate whether these brain waves mediate reactivation. If they support memory reactivation, we further reasoned that it could be possible to decipher memory signals at the time that these spindles took place."

      To test their hypotheses, Cairney and his colleagues asked 46 participants "to learn associations between words and pictures of objects or scenes before a nap." Afterward, some of the participants took a 90-minute nap, whereas others stayed awake. To those who napped, "Half of the words were [...] replayed during the nap to trigger the reactivation of the newly learned picture memories," explains Cairney.

      "When the participants woke after a good period of sleep," he says, "we presented them again with the words and asked them to recall the object and scene pictures. We found that their memory was better for the pictures that were connected to the words that were presented in sleep, compared to those words that weren't," Cairney reports.

      Using an EEG machine, the researchers were also able to see that playing the associated words to reactivate memories triggered sleep spindles in the participants' brains. More specifically, the EEG sleep spindle patterns "told" the researchers whether the participants were processing memories related to objects or memories related to scenes.

      "Our data suggest that spindles facilitate processing of relevant memory features during sleep and that this process boosts memory consolidation," says Staresina. "While it has been shown previously," he continues, "that targeted memory reactivation can boost memory consolidation during sleep, we now show that sleep spindles might represent the key underlying mechanism."

      Cairney adds, "When you are awake you learn new things, but when you are asleep you refine them, making it easier to retrieve them and apply them correctly when you need them the most. This is important for how we learn but also for how we might help retain healthy brain functions."

      Staresina suggests that this newly gained knowledge could lead to effective strategies for boosting memory while sleeping.

      So, though learning things from scratch à la "Dexter's Lab" may take a while to become a reality, we can safely say that our brains continue to learn while we sleep, and that researchers just got a lot closer to understanding why this happens.

                                From: https://www.medicalnewstoday.com/articles/Mar/2018

                                         T E X T

                          Can you learn in your sleep?

      Sleep is known to be crucial for learning and memory formation. What's more, scientists have even managed to pick out specific memories and consolidate them during sleep. However, the exact mechanisms behind this were unknown — until now.

      Those among us who grew up with the popular cartoon "Dexter's Laboratory" might remember the famous episode wherein Dexter's trying to learn French overnight. He creates a device that helps him to learn in his sleep by playing French phrases to him. Of course, since the show is a comedy, Dexter's record gets stuck on the phrase "Omelette du fromage" and the next day he's incapable of saying anything else. This is, of course, a problem that puts him through a series of hilarious situations.

      The idea that we can learn in our sleep has captivated the minds of artists and scientists alike; the possibility that one day we could all drastically improve our productivity by learning in our sleep is very appealing. But could such a scenario ever become a reality?

      New research seems to suggest so, and scientists in general are moving closer to understanding precisely what goes on in the brain when we sleep and how the restful state affects learning and memory formation.

      For instance, previous studies have shown that non-rapid eye movement (non-REM) sleep — or dreamless sleep — is crucial for consolidating memories. It has also been shown that sleep spindles, or sudden spikes in oscillatory brain activity that can be seen on an electroencephalogram (EEG) during the second stage of non-REM sleep, are key for this memory consolidation. Scientists were also able to specifically target certain memories and reactivate, or strengthen, them by using auditory cues.

      However, the mechanism behind such achievements remained mysterious until now. Researchers were also unaware if such mechanisms would help with memorizing new information.

      Therefore, a team of researchers set out to investigate. Scott Cairney, from the University of York in the United Kingdom, co-led the research with Bernhard Staresina, who works at the University of Birmingham, also in the U.K. Their findings were published in the journal Current Biology.

      Cairney explains the motivation for the research, saying, "We are quite certain that memories are reactivated in the brain during sleep, but we don't know the neural processes that underpin this phenomenon." "Sleep spindles," he continues, "have been linked to the benefits of sleep for memory in previous research, so we wanted to investigate whether these brain waves mediate reactivation. If they support memory reactivation, we further reasoned that it could be possible to decipher memory signals at the time that these spindles took place."

      To test their hypotheses, Cairney and his colleagues asked 46 participants "to learn associations between words and pictures of objects or scenes before a nap." Afterward, some of the participants took a 90-minute nap, whereas others stayed awake. To those who napped, "Half of the words were [...] replayed during the nap to trigger the reactivation of the newly learned picture memories," explains Cairney.

      "When the participants woke after a good period of sleep," he says, "we presented them again with the words and asked them to recall the object and scene pictures. We found that their memory was better for the pictures that were connected to the words that were presented in sleep, compared to those words that weren't," Cairney reports.

      Using an EEG machine, the researchers were also able to see that playing the associated words to reactivate memories triggered sleep spindles in the participants' brains. More specifically, the EEG sleep spindle patterns "told" the researchers whether the participants were processing memories related to objects or memories related to scenes.

      "Our data suggest that spindles facilitate processing of relevant memory features during sleep and that this process boosts memory consolidation," says Staresina. "While it has been shown previously," he continues, "that targeted memory reactivation can boost memory consolidation during sleep, we now show that sleep spindles might represent the key underlying mechanism."

      Cairney adds, "When you are awake you learn new things, but when you are asleep you refine them, making it easier to retrieve them and apply them correctly when you need them the most. This is important for how we learn but also for how we might help retain healthy brain functions."

      Staresina suggests that this newly gained knowledge could lead to effective strategies for boosting memory while sleeping.

      So, though learning things from scratch à la "Dexter's Lab" may take a while to become a reality, we can safely say that our brains continue to learn while we sleep, and that researchers just got a lot closer to understanding why this happens.

                                From: https://www.medicalnewstoday.com/articles/Mar/2018

                        More than 100 South African gold miners

                                treated for smoke inhalation

      JOHANNESBURG (Reuters) – Hundreds of South African gold mine workers were rescued and over 100 treated for smoke inhalation after an underground fire, the National Union of Mineworkers (NUM) said on Thursday.

      Safety is a huge issue in South Africa’s dangerous deep-level mines and a focus for investors. A spate of deaths at SibanyeStillwater’s gold operations, including a seismic event that killed seven miners in early May, has highlighted the risks.

      In the latest incident, more than 600 miners were initially trapped after a fire broke out at a mine east of Johannesburg operated by unlisted Gold One, NUM said.

      This comes almost two weeks after five miners died in an underground fire at a South African copper mine operated by unlisted Palabora Mining Company in Limpopo.

      Company officials could not immediately be reached for comment.

      “As the NUM, we vehemently condemn this kind of incident as it is becoming a trend”, the union said in a statement.

(Disponível em:<https://www.reuters.com/article/us-safrica-mining-fire/more-than-100-south-african-gold-miners-treated-for-smoke-inhalation-idUSKBN1KG294  .)

TEXTO 3:

THIS SIMPLE MIND TRICK CAN INSTANTLY BOOST

YOUR WILLPOWER BY

ELISA ROLAND

A good dose of willpower is often necessary to see any task through, whether it’s sticking to a spending plan or finishing that great American novel.

And if you want to increase that willpower, you just simply have to believe you have it, suggests a new study supported by the Swiss National Science Foundation.

“What matters most is what we think about our willpower,” leader study author Christopher Napolitano, educational psychology professor at the University of Illinois told the University of Illinois News Bureau. “When we view our willpower as limited, it’s similar to a muscle that gets tired and needs rest. If we believe it is a finite resource, we act that way, feeling exhausted and needing breaks between demanding mental tasks, while people who view their willpower as a limitless resource get energized instead.”

Napolitano and study co-author Veronika Job of the University of Zurich tested the validity of the Implicit Theory of Willpower for Strenuous Mental Activities Scale, a psychological assessment tool. They asked 1,100 Americans and 1,600 Europeans to weigh in on statements such as “After a strenuous mental activity, your energy is depleted, and you must rest to get it refueled again.”

Although there was little difference between men and women overall, Americans were more likely to admit to needing breaks after completing mentally challenging tasks, while European participants became more invigorated to keep going.

Based on the findings, Napolitano suggests that the key to amp up your willpower is to believe that you have an abundant supply of it.

“Your feelings about your willpower affect the way you behave—but these feelings are changeable,” he said. “Changing your beliefs about the nature of your self-control can have positive effects on development, leading to healthier behaviors and perceptions of others.”

Now that you have the drive, make sure you have the other winning attributes all successful people have in common.

Available at: <https://www.rd.com/advice/work-career/trick-boost-willpower/>.

Verifique se as sentenças abaixo são verdadeiras ou falsas de acordo com o texto:

( ) Um novo estudo sugere que a chave para aumentar sua força de vontade é acreditar que você tem uma oferta abundante dela.

( ) Pessoas que acreditam que sua força de vontade é finita não conseguem realizar tarefas mentais mais exigentes.

( ) O estudo revelou que os Americanos eram propensos a admitir a necessidade de pausas após a conclusão de tarefas mentalmente desafiadoras.

( ) Segundo Napolitano, os sentimentos sobre a força de vontade afetam a maneira como um indivíduo se comporta, porém esses sentimentos não são mutáveis.

Assinale a sequência correta:

TEXTO 2:

                                                                                                    24 March 2018

             Drivers are being temporarily blinded by modern vehicle

                       headlights, according to an RAC survey.

      Two-thirds of drivers say they are "regularly dazzled" by oncoming headlights even though they are dipped, the survey of 2,061 motorists suggests.

      And 67% of those said it can take up to fi ve seconds for their sight to clear with a further 10% claiming the eff ect on their eyes lasts up to 10 seconds.

The RAC said advances in headlight technology were causing the problem.

      About 15% of those drivers polled said they had nearly suff ered a collision as a result of being dazzled by other drivers using full-beam headlights.

'Unwanted risk'

      RAC road safety spokesman Pete Williams said: "The intensity and brightness of some new car headlights is clearly causing diffi culty for other road users.

      "Headlight technology has advanced considerably in recent years, but while that may be better for the drivers of those particular vehicles, it is presenting an unwanted, new road safety risk for anyone driving towards them or even trying to pull out at a junction.”

      All cars sold for road use in the UK have to be fi tted with headlamps that conform to standards set by the EU in line with the UN's World Forum for Harmonization of Vehicle Regulations.

      A UN working party is currently looking at the issue of headlight glare with its next meeting due to be held at the end of next month.

Available at: <http://www.bbc.com/news/uk-43525525>

TEXTO 1:

               YOUTUBE TO BAN VIDEOS PROMOTING GUN SALES

                                                            By NIRAJ CHOKSHI    MARCH 22, 2018

      YouTube said this week that it would tighten restrictions on some firearm videos, its latest policy announcement since coming under scrutiny after last month’s mass shooting at a high school in Parkland, Fla.

      The video-streaming service, which is owned by Google, said it would ban videos that promote either the construction or sale of firearms and their accessories. The new policy, developed with expert advice over the last four months, will go into effect next month, it said.

      “While we’ve long prohibited the sale of firearms, we recently notified creators of updates we will be making around content promoting the sale or manufacture of firearms and their accessories, specifically, items like ammunition, gatling triggers, and drop-in auto sears,” YouTube said in a statement.

      YouTube, which described the move as part of “regular changes” to policy, notified users in a Monday forum post. The company had previously banned videos showing how to make firearms discharge faster, a technique used by the gunman who killed 58 people in Las Vegas last fall.

      The announcement comes days before planned student-led protests against gun violence on Saturday. It was met with frustration from gun rights advocates.

      “Much like Facebook, YouTube now acts as a virtual public square,” the National Shooting Sports Foundation, a private group representing gun makers, said in a statement. “The exercise of what amounts to censorship, then, can legitimately be viewed as the stifling of commercial free speech, which has constitutional protection. Such actions also impinge on the Second Amendment.”

      The policy shift comes as YouTube and other technology platforms face increased scrutiny after the Parkland shooting, in which 17 people were killed at Marjory Stoneman Douglas High School.

      Days after that massacre, a video promoting a baseless conspiracy about a shooting survivor became the top-trending video on YouTube, prompting a crackdown on such videos. YouTube’s chief executive also said that the platform planned to fight misinformation by working in partnership with Wikipedia, the nonprofit userrun online encyclopedia. But Wikipedia said it knew nothing about that plan.

      Other businesses have also made changes amid growing pressure following the Parkland attack.

      Dick’s Sporting Goods, Walmart and Kroger all raised the age limit for firearm purchases to 21. The retail chains REI and Mountain Equipment Co-op suspended orders of some popular products because the company that owns those brands, Vista Outdoor, also manufactures assault-style rifles.

      In 2016, Facebook announced a ban on private gun sales on its flagship website as well as on Instagram, the photo-sharing social network it owns. Anti-gun activists have complained that sellers still found ways around Facebook’s ban.

Available at:<https://www.nytimes.com/2018/03/22/business/youtube-gun-ban.h...m_unit&version=latest&contentPlacement=5&pgtype=sectionfront>.