Questões de Concursos UECE

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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 canbe 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

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EL TIGRE, Venezuela — Thousands of workers are fleeing Venezuela’s state-owned oil company, abandoning once-coveted jobs made worthless by the worst inflation in the world. And now the hemorrhaging is threatening the nation’s chances of overcoming its long economic collapse.

Desperate oil workers and criminals are also stripping the oil company of vital equipment, vehicles, pumps and copper wiring, carrying off whatever they can to make money. The double drain — of people and hardware — is further crippling a company that has been teetering for years yet remains the country’s most important source of income.

The timing could not be worse for Venezuela’s increasingly authoritarian president, Nicolás Maduro, who was re-elected last month in a vote that has been widely condemned by leaders across the hemisphere. Prominent opposition politicians were either barred from competing in the election, imprisoned or in exile.

But while Mr. Maduro has firm control over the country, Venezuela is on its knees economically, buckled by hyperinflation and a history of mismanagement. Widespread hunger, political strife, devastating shortages of medicine and an exodus of well over a million people in recent years have turned this country, once the economic envy of many of its neighbors, into a crisis that is spilling over international borders.

If Mr. Maduro is going to find a way out of the mess, the key will be oil: virtually the only source of hard currency for a nation with the world’s largest estimated petroleum reserves. But each month Venezuela produces less of it. Offices at the state oil company are emptying out, crews in the field are at half strength, pickup trucks are stolen and vital materials vanish. All of this is adding to the severe problems at the company that were already acute because of corruption, poor maintenance, crippling debts, the loss of professionals and even a lack of spare parts.

Now workers at all levels are walking away in large numbers, sometimes literally taking piecesof the company with them, union leaders, oil executives and workers say.

A job with Petróleos de Venezuela, known as Pdvsa, used to be a ticket to the Venezuelan Dream. No more.

Inflation in Venezuela is projected to reach an astounding 13,000 percent this year, according to the International Monetary Fund. When The New York Times interviewed Mr. Navas in May, the monthly salary for a worker like him was barely enough to buy a whole chicken or two pounds of beef. But with prices going up so quickly, it buys even less now.

Junior Martínez, 28, who has worked in the oil industry for eight years, is assembling papers, including his diploma as a chemical engineer. His wife and her daughter left three months ago to earn money in Brazil. “I get 1,400,000 bolívars a week and it isn’t even enough to buy a carton of eggs or a tube of toothpaste,”Mr. Martínez said of his salary in bolívars, Venezuela’s currency.

Mr. Martínez’s father, Ovidio Martínez, 55, recalled growing up here when the oil boom began. He cried as he spoke of his son’s determination to leave the country. “You watch your children leave and you can’t stop them,” the elder Mr. Martínez said, fighting back tears. “In this country, they don’t have a future.”

In El Tigre, hundreds of people stood in line one recent morning outside a supermarket, many waiting since the evening before to buy whatever food they could.

From: www.nytimes.com/June 14, 2018. Adapted.

How a Canadian Chain Is Reinventing Book Selling

By Alexandra Alter

About a decade ago, Heather Reisman, the chief executive of Canada’s largest bookstore chain, was having tea with the novelist Margaret Atwood when Ms. Atwood inadvertently gave her an idea for a new product. Ms. Atwood announced that she planned to go home, put on a pair of cozy socks and curl up with a book. Ms. Reisman thought about how appealing that sounded. Not long after, her company, Indigo, developed its own brand of plush “reading socks.” They quickly became one of Indigo’s signature gift items.

“Last year, all my friends got reading socks,” said Arianna Huffington, the HuffPost cofounder and a friend of Ms. Reisman’s, who also gave the socks as gifts to employees at her organization Thrive. “Most people don’t have reading socks — not like Heather’s reading socks.”

Over the last few years, Indigo has designed dozens of other products, including beach mats, scented candles, inspirational wall art, Mason jars, crystal pillars, bento lunchboxes, herb growing kits, copper cheese knife sets, stemless champagne flutes, throw pillows and scarves.

It may seem strange for a bookstore chain to be developing and selling artisanal soup bowls and organic cotton baby onesies. But Indigo’s approach seems not only novel but crucial to its success and longevity. The superstore concept, with hulking retail spaces stocking 100,000 titles, has become increasingly hard to sustain in the era of online retail, when it’s impossible to match Amazon’s vast selection.

Indigo is experimenting with a new model, positioning itself as a “cultural department store” where customers who wander in to browse through books often end up lingering as they impulsively shop for cashmere slippers and crystal facial rollers, or a knife set to go with a new Paleo cookbook. Over the past few years, Ms. Reisman has reinvented Indigo as a Goop-like, curated lifestyle brand, with sections devoted to food, health and wellness, and home décor.

Ms. Reisman is now importing Indigo’s approach to the United States. Last year, Indigo opened its first American outpost, at a luxury mall in Millburn, N.J., and she eventually plans to open a cluster of Indigos in the Northeast. Indigo’s ascendance is all the more notable given the challenges that big bookstore chains have faced in the United States. Borders, which once had more than 650 locations, filed for bankruptcy in 2011. Barnes & Noble now operates 627 stores, down from 720 in 2010, and the company put itself up for sale last year. Lately, it has been opening smaller stores, including an 8,300-square-foot outlet in Fairfax County, Va.

“Cross-merchandising is Retail 101, and it’s hard to do in a typical bookstore,” said Peter Hildick-Smith, president of the Codex Group, which analyzes the book industry. “Indigo found a way to create an extra aura around the bookbuying experience, by creating a physical extension of what you’re reading about.”

The atmosphere is unabashedly intimate, cozy and feminine — an aesthetic choice that also makes commercial sense, given that women account for some 60 percent of book buyers. A section called “The Joy of the Table” stocks Indigobrand ceramics, glassware and acacia wood serving platters with the cookbooks. The home décor section has pillows and throws, woven baskets, vases and scented candles. There’s a subsection called “In Her Words,” which features idea-driven books and memoirs by women. An area labeled “A Room of Her Own” looks like a lushdressing room, with vegan leather purses, soft gray shawls, a velvet chair, scarves and journals alongside art, design and fashion books.

Books still account for just over 50 percent of Indigo’s sales and remain the central draw; the New Jersey store stocks around 55,000 titles. But they also serve another purpose: providing a window into consumers’ interests, hobbies, desires and anxieties, which makes it easier to develop and sell related products.

Publishing executives, who have watched with growing alarm as Barnes & Noble has struggled, have responded enthusiastically to Ms. Reisman’s strategy. “Heather pioneered and perfected the art of integrating books and nonbook products,” Markus Dohle, the chief executive of Penguin Random House, said in an email.

Ms. Reisman has made herself and her own tastes and interests central to the brand. The front of the New Jersey store features a section labeled “Heather’s Picks,” with a display table covered with dozens of titles. A sign identifies her as the chain’s “founder, C.E.O., Chief Booklover and the Heather in Heather’s Picks.” She appears regularly at author signings and store events, and has interviewed prominent authors like Malcolm Gladwell, James Comey, Sally Field, Bill Clinton and Nora Ephron.

When Ms. Reisman opened the first Indigo store in Burlington, Ontario, in 1997, she had already run her own consulting firm and later served as president of a soft drink and beverage company, Cott. Still, bookselling is an idiosyncratic industry, and many questioned whether Indigo could compete with Canada’s biggest bookseller, Chapters. Skepticism dissolved a few years later when Indigo merged with Chapters, inheriting its fleet of national stores. The company now has more than 200 outlets across Canada, including 89 “superstores.” Indigo opened its first revamped concept store in 2016.

The new approach has proved lucrative: In its 2017 fiscal year, the company’s revenue exceeded $1 billion Canadian for the first time. In its 2018 fiscal year, Indigo reported a revenue increase of nearly $60 million Canadian over the previous year, making it the most profitable year in the chain’s history.

The company’s dominance in Canada doesn’t guarantee it will thrive in the United States, where it has to compete not only with Amazon and Barnes & Noble, but with a resurgent wave of independent booksellers. After years of decline, independent stores have rebounded, with some 2,470 locations, up from 1,651 a decade ago, according to the American Booksellers Association. And Amazon has expanded into the physical retail market, with around 20 bookstores across the United States.

Ms. Reisman acknowledges that the company faces challenges as it expands southward. Still, she’s optimistic, and is already scouting locations for a second store near New York.

https://www.nytimes.com/2019/05/01

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Britain, Norway and the United States join forces with businesses to protect tropical forests.

Britain, Norway and the United States said Thursday they would join forces with some of the world’s biggest companies in an effort to rally more than $1 billion for countries that can show they are lowering emissions by protecting tropical forests. The goal is to make intact forests more economically valuable than they would be if the land were cleared for timber and agriculture.

The initiative comes as the world loses acre after acre of forests to feed global demand for soy, palm oil, timber and cattle. Those forests, from Brazil to Indonesia, are essential to limiting the linked crises of climate change and a global biodiversity collapse. They are also home to Indigenous and other forest communities. Amazon, Nestlé, Unilever, GlaxoSmithKline and Salesforce are among the companies promising money for the new initiative, known as the LEAF Coalition.

Last year, despite the global downturn triggered by the pandemic, tropical deforestation was up 12 percent from 2019, collectively wiping out an area about the size of Switzerland. That destruction released about twice as much carbon dioxide into the atmosphere as cars in the United States emit annually.

“The LEAF Coalition is a groundbreaking example of the scale and type of collaboration that is needed to fight the climate crisis and achieve net-zero emissions globally by 2050,” John Kerry, President Biden’s senior climate envoy, said in a statement. “Bringing together government and privatesector resources is a necessary step in supporting the large-scale efforts that must be mobilized to halt deforestation and begin to restore tropical and subtropical forests.”

An existing global effort called REDD+ has struggled to attract sufficient investment and gotten mired in bureaucratic slowdowns. This initiative builds on it, bringing private capital to the table at the country or state level. Until now, companies have invested in forests more informally, sometimes supporting questionable projects that prompted accusations of corruption and “greenwashing,” when a company or brand portrays itself as an environmental steward but its true actions don’t support the claim.

The new initiative will use satellite imagery to verify results across wide areas to guard against those problems. Monitoring entire jurisdictions would, in theory, prevent governments from saving forestland in one place only to let it be cut down elsewhere.

Under the plan, countries, states or provinces with tropical forests would commit to reducing deforestation and degradation. Each year or two, they would submit their results, calculating the number of tons of carbon dioxide reduced by their efforts. An independent monitor would verify their claims using satellite images and other measures. Companies and governments would contribute to a pool of money that would pay the national or regional government at least $10 per ton of reduced carbon dioxide.

Companies will not be allowed to participate unless they have a scientifically sound plan to reach net zero emissions, according to Nigel Purvis, the chief executive of Climate Advisers, a group affiliated with the initiative. “Their number one obligation to the world from a climate standpoint is to reduce their own emissions across their supply chains, across their products, everything,” Mr. Purvis said. He also emphasized that the coalition’s plans would respect the rights of Indigenous and forest communities.

From: www.nytimes.com/April 22, 2021