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This is your brain on pandemic: What chronic stress is doing to us – CBC.ca

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Back in the 1980s, there was a public service announcement on TV that you may remember — or may have seen on YouTube.

A guy in a kitchen held up an egg and said, “This is your brain.” Then he cracked the egg into a hot frying pan, and said, “This is your brain on drugs.”

One year into this pandemic, your brain might be feeling a bit like that egg: Fried.

“Everything is so much harder,” said Stephanie Johnson, a client relationship executive at Sun Life who lives in Toronto. “I don’t have the motivation that I used to have. I don’t have the efficiency that I used to have.”

“Defeated” is how Vas Smountas, a freelance graphic designer, describes it. Also living in Toronto, she describes herself these days as “tired, defeated, foggy, unmotivated.”

And research suggests those feelings are not uncommon right now, as the chronic stress of the pandemic has both affected our brains — and robbed us of normal, healthy ways to cope.

Reduced cognition due to stress

Just shy of one year into the pandemic, a national survey of Canadians suggested that more than half of all respondents — 56 per cent — said they were feeling increased stress or anxiety as a result of COVID-19.  Among those aged 18-34, it was even higher, at 63 per cent. 

You don’t have to be lonely or depressed — you’re just living through a pandemic. Or as Dr. Roger McIntyre describes it, “daily, unpredictable, malignant stress.”

McIntyre, a professor of psychiatry and pharmacology at the University of Toronto’s Temerty Faculty of Medicine, has recently co-authored a review on cognitive impairment in patients with COVID-19, which found prevalence of delirium and markers of inflammation.

You don’t have to be lonely or depressed to be feeling lethargic or disengaged from life right now. (DGLimages/Shutterstock)

For the rest of us, living in a world changed by the disease, McIntyre says our cognitive issues come from stress.

He describes two kinds of stress: one which is short and predictable and has an end point, and another which is long in duration, unpredictable and seems interminable.

That second one sound familiar? Yup. Pandemic. 

Unpredictability upon layers of unpredictability, as McIntyre put it. 

‘It’s just a lot to take in’

Even among the most optimistic and positive people, the resulting stress is having an impact. 

“Chronic stress, predictably, has this pronounced effect on our motivation, our energy, our get-up-and-go, our sense of joie de vivre,” said McIntyre. 

It also affects brain tissue. 

“The brain is no different than the motherboard on your PC. It is a set of circuits and networks, all interconnected,” McIntyre said. 

“Work that’s looked at the effect of chronic, malignant, unpredictable stress on the brain has shown loss of brain tissue. And not just randomly anywhere in the brain. Key brain areas that are responsible for what you and I need to do each day: think and feel.”

“It’s just a lot to take in,” said Smountas. “Every day, you get up and it’s the same thing. And you feel like you’re in this Groundhog Day movie that just doesn’t end without any learnings at the end of it. It’s been trying.”

Vas Smountas says the pandemic has left her feeling tired, foggy, and unmotivated. (Robin Tampas)

It’s not just about mood. 

“I literally don’t think I go a day without saying my brain isn’t functioning. Like, I can’t remember. I’m not operating at 100 per cent,” Johnson said.

“What happens is stress systems have been activated,” McIntyre explains.

“You’ve got hormones, you’ve got inflammatory proteins, you’ve got a variety of neurochemicals, [and they] have created a mix which, in the longer term, jeopardizes the brain’s health, creating this loss of brain tissue, resulting in a loss of brain interconnectivity.”

Stress — or just boredom?

Some people have wondered if what they’re feeling is just straight up boredom. 

But boredom, in all its tediousness, can actually be a good thing, according to Erin Westgate, an assistant professor of psychology at the University of Florida who has studied boredom for years. 

Stephanie Johnson says she is having trouble remembering things and feels like she is not functioning at 100 per cent. (Submitted by Stephanie Johnson)

It’s usually a signal that something is wrong — telling a person that what they are doing right now isn’t engaging or doesn’t feel meaningful and that they need to do something to change that. 

“But boredom wasn’t designed to let us know that there’s a pandemic going on,” said Westgate. 

“We know that boredom is caused by a lack of meaning and a lack of attention. And finding ways to challenge yourself, finding ways to reintroduce the meaning into your life, can reduce boredom,” she said. “But ultimately, it’s sort of like trying to push a rock up a big hill, you know. The way to solve boredom during the pandemic is to end the pandemic.”

Not something you can do yourself. And in addition to having no control over when this will end, the pandemic has also taken away the systems to which we normally turn in stressful times for comfort and healing.

LISTEN | Separating stress from burnout:

Airplay6:51How to tell when stress becomes burnout

Money columnist Bruce Sellery says it’s important for everyone to realize how stressful the past year has been, and how dangerous workplace stress and burnout can be. 6:51

Brains can heal

With so-called “normal” stress — that which is predictable and finite — and even the biggest stressors in life such as death or divorce or the loss of a job, people are able to rely on different ways of coping: having a job, hanging out with friends or extended family, going to a place of worship or to a community centre.

But in many cases, those have been compromised, too. 

The pandemic has also gotten in the way of strategies we could normally use to relieve stress, like gathering with friends and family. But the brain does heal, too. (Ben Nelms/CBC)

The brain does heal, though.

“The brain is incredibly plastic and incredibly modifiable and incredibly able to regenerate,” McIntyre said. And once the source of stress is removed, the brain circuits begin to normalize again. 

“You see a correction of brain circuit function, and you also see a rejuvenation of brain tissue because our brains, our neurons, our brain cells, continue to grow.”

And in the case of the pandemic, once most people are fully vaccinated, once life returns to what is commonly thought of as “normal” — with kids in school, and people at work, and restaurants full of people hanging out together without masks on — McIntyre says brain recoverability should follow in short order.

“Based on research that looks at brain function and brain anatomy before and then after intervention for people who’ve gone through stress-related conditions, you start to see changes fairly quickly.”


The Ipsos survey cited in this article was conducted between February 8-10, 2021. A sample of 1,000 Canadians aged 18+ was interviewed online, with a margin of error of ± 3.5 percentage points, 19 times out of 20. 

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NASA's Perseverance Mars Rover Extracts First Oxygen from Red Planet – Stockhouse

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WASHINGTON , April 21, 2021 /PRNewswire/ — The growing list of “firsts” for Perseverance, NASA’s newest six-wheeled robot on the Martian surface, includes converting some of the Red Planet’s thin, carbon dioxide-rich atmosphere into oxygen. A toaster-size, experimental instrument aboard Perseverance called the Mars Oxygen In-Situ Resource Utilization Experiment ( MOXIE ) accomplished the task. The test took place April 20 , the 60th Martian day, or sol, since the mission landed Feb. 18 .

While the technology demonstration is just getting started, it could pave the way for science fiction to become science fact – isolating and storing oxygen on Mars to help power rockets that could lift astronauts off the planet’s surface. Such devices also might one day provide breathable air for astronauts themselves. MOXIE is an exploration technology investigation – as is the Mars Environmental Dynamics Analyzer ( MEDA ) weather station – and is sponsored by NASA’s Space Technology Mission Directorate (STMD) and Human Exploration and Operations Mission Directorate.

“This is a critical first step at converting carbon dioxide to oxygen on Mars,” said Jim Reuter , associate administrator for STMD. “MOXIE has more work to do, but the results from this technology demonstration are full of promise as we move toward our goal of one day seeing humans on Mars. Oxygen isn’t just the stuff we breathe. Rocket propellant depends on oxygen, and future explorers will depend on producing propellant on Mars to make the trip home.”

For rockets or astronauts, oxygen is key, said MOXIE’s principal investigator, Michael Hecht of the Massachusetts Institute of Technology’s Haystack Observatory.

To burn its fuel, a rocket must have more oxygen by weight. Getting four astronauts off the Martian surface on a future mission would require approximately 15,000 pounds (7 metric tons) of rocket fuel and 55,000 pounds (25 metric tons) of oxygen. In contrast, astronauts living and working on Mars would require far less oxygen to breathe. “The astronauts who spend a year on the surface will maybe use one metric ton between them,” Hecht said.

Hauling 25 metric tons of oxygen from Earth to Mars would be an arduous task. Transporting a one-ton oxygen converter – a larger, more powerful descendant of MOXIE that could produce those 25 tons – would be far more economical and practical.

Mars’ atmosphere is 96% carbon dioxide. MOXIE works by separating oxygen atoms from carbon dioxide molecules, which are made up of one carbon atom and two oxygen atoms. A waste product, carbon monoxide, is emitted into the Martian atmosphere.

The conversion process requires high levels of heat to reach a temperature of approximately 1,470 degrees Fahrenheit (800 Celsius). To accommodate this, the MOXIE unit is made with heat-tolerant materials. These include 3D-printed nickel alloy parts, which heat and cool the gases flowing through it, and a lightweight aerogel that helps hold in the heat. A thin gold coating on the outside of MOXIE reflects infrared heat, keeping it from radiating outward and potentially damaging other parts of Perseverance.

In this first operation, MOXIE’s oxygen production was quite modest – about 5 grams, equivalent to about 10 minutes worth of breathable oxygen for an astronaut. MOXIE is designed to generate up to 10 grams of oxygen per hour.

This technology demonstration was designed to ensure the instrument survived the launch from Earth, a nearly seven-month journey through deep space, and touchdown with Perseverance on Feb. 18 . MOXIE is expected to extract oxygen at least nine more times over the course of a Martian year (nearly two years on Earth).

These oxygen-production runs will come in three phases. The first phase will check out and characterize the instrument’s function, while the second phase will run the instrument in varying atmospheric conditions, such as different times of day and seasons. In the third phase, Hecht said, “we’ll push the envelope” – trying new operating modes, or introducing “new wrinkles, such as a run where we compare operations at three or more different temperatures.”

“MOXIE isn’t just the first instrument to produce oxygen on another world,” said Trudy Kortes , director of technology demonstrations within STMD. It’s the first technology of its kind that will help future missions “live off the land,” using elements of another world’s environment, also known as in-situ resource utilization .

“It’s taking regolith, the substance you find on the ground, and putting it through a processing plant, making it into a large structure, or taking carbon dioxide – the bulk of the atmosphere – and converting it into oxygen,” she said. “This process allows us to convert these abundant materials into useable things: propellant, breathable air, or, combined with hydrogen, water.”

More About Perseverance

A key objective of Perseverance’s mission on Mars is astrobiology , including the search for signs of ancient microbial life. The rover will characterize the planet’s geology and past climate, pave the way for human exploration of the Red Planet, and be the first mission to collect and cache Martian rock and regolith (broken rock and dust).

Subsequent NASA missions, in cooperation with ESA (European Space Agency), would send spacecraft to Mars to collect these sealed samples from the surface and return them to Earth for in-depth analysis.

The Mars 2020 Perseverance mission is part of NASA’s Moon to Mars exploration approach, which includes Artemis missions to the Moon that will help prepare for human exploration of the Red Planet.

NASA’s Jet Propulsion Laboratory in Southern California , which is managed for NASA by Caltech in Pasadena, California , built and manages operations of the Perseverance rover.

For more about Perseverance:

https://mars.nasa.gov/mars2020/

and

https://www.nasa.gov/perseverance

Cision View original content to download multimedia: http://www.prnewswire.com/news-releases/nasas-perseverance-mars-rover-extracts-first-oxygen-from-red-planet-301274247.html

SOURCE NASA

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Breathtaking NASA Image Shows a Magical ‘Sea of Dunes’ on Mars

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On Thursday, NASA released a stunning photo of a sea of dunes on Mars.

It also shows wind-sculpted lines surrounding Mars’ frosty northern polar cap.

The section captured in the shot represents an area that is 31 kilometers (19 miles) wide, NASA said. The sea of dunes, however, actually covers an area as large as Texas.

The photo is a false color image, meaning that the colors are representative of temperatures. Blue represents cooler climes, and the shades of yellow mark out “sun-warmed dunes,” the US space agency wrote.

Sea of dark dunes surrounds Mars’ northern polar cap.(NASA/JPL-Caltech/ASU)

The photo is made of a combination of images captured by the Thermal Emission Imaging System instrument on the Mars Odyssey orbiter, NASA wrote.

Captured during the period from December 2002 to November 2004, the breathtaking images have been released to mark the 20th anniversary of Odyssey.

The Mars Odyssey orbiter is a robotic spacecraft circling Mars that uses a thermal imager to detect evidence of water and ice on the planet.

It was launched in 2001, making it the longest-working Mars spacecraft in history.

Source:- ScienceAlert

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Humans actually hunted large animals and ate mostly meat for 2 millions years: study – CTV News

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TORONTO —
Despite a widespread belief that humans owe their evolution to the dietary flexibility in eating both meat and vegetables, researchers in Israel suggest that early humans were actually apex predators who hunted large animals for two million years before they sought vegetables to supplement their diet.

In a study recently published in the American Journal of Physical Anthropology, academics from Tel Aviv University in Israel and the University of Minho in Portugal examined modern biology to determine if stone-age humans were specialized carnivores or generalist omnivores.

“So far, attempts to reconstruct the diet of Stone-Age humans were mostly based on comparisons to 20th century hunter-gatherer societies,” one of the study’s authors, Miki Ben-Dor, a researcher at Tel Aviv University, said in a press release.

“This comparison is futile, however, because two million years ago hunter-gatherer societies could hunt and consume elephants and other large animals – while today’s hunter gatherers do not have access to such bounty.”

Instead, the researchers looked at approximately 400 previous scientific studies on human anatomy and physiology as well as archeological evidence from the Pleistocene period, or “Ice Age” period, which began about 2.6 million years ago, and lasted until 11,700 years ago.

“We decided to use other methods to reconstruct the diet of Stone-Age humans: to examine the memory preserved in our own bodies, our metabolism, genetics and physical build,” Ben-Dor said.

“Human behaviour changes rapidly, but evolution is slow. The body remembers.”

They discovered 25 lines of evidence from the studied papers on human biology that seem to show that earlier Homo sapiens were apex predators at the top of the food chain.

For example, the academics explained that humans have a high acidity in their stomachs when compared to omnivores or even other predators, which is important for consuming animal products.

“Strong acidity provides protection from harmful bacteria found in meat, and prehistoric humans, hunting large animals whose meat sufficed for days or even weeks, often consumed old meat containing large quantities of bacteria, and thus needed to maintain a high level of acidity,” Ben-Dor said.

Another piece of evidence, according to the study, is the structure of human fat cells.

“In the bodies of omnivores, fat is stored in a relatively small number of large fat cells, while in predators, including humans, it’s the other way around: we have a much larger number of smaller fat cells,” Ben-Dor said.

HUNTING EXPERTS

In addition to the evidence they collected by studying human biology, the researchers said archeological evidence from the Pleistocene period supports their theory.

In one example, the study’s authors examined stable isotopes in the bones of prehistoric humans as well as their hunting practices and concluded these early humans specialized in hunting large and medium-sized animals with high fat content.

“Comparing humans to large social predators of today, all of whom hunt large animals and obtain more than 70% of their energy from animal sources, reinforced the conclusion that humans specialized in hunting large animals and were in fact hypercarnivores,” the academics noted.

Ben-Dor said Stone-Age humans’ expertise in hunting large animals played a major role in the extinction of certain large animals, such as mammoths, mastodons, and giant sloths.

“Most probably, like in current-day predators, hunting itself was a focal human activity throughout most of human evolution. Other archeological evidence – like the fact that specialized tools for obtaining and processing vegetable foods only appeared in the later stages of human evolution – also supports the centrality of large animals in the human diet, throughout most of human history,” he said.

This is not to say, however, that humans during this period didn’t eat any plants. Ben-Dor said they also consumed plants, but they weren’t a major component of their diet until the end of the era when the decline of animal food sources led humans to increase their vegetable intake.

Eventually, the researchers said humans had no choice but to domesticate both plants and animals and become farmers.

Ran Barkai, one of the study’s authors and a professor at Tel Aviv University, said their findings have modern-day implications.

“For many people today, the Paleolithic diet is a critical issue, not only with regard to the past, but also concerning the present and future. It is hard to convince a devout vegetarian that his/her ancestors were not vegetarians, and people tend to confuse personal beliefs with scientific reality,” he said. 

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