NASA's Mars Perseverance rover provides front-row seat to landing, first audio recording of Red Planet

 New video from NASA's Mars 2020 Perseverance rover chronicles major milestones during the final minutes of its entry, descent, and landing (EDL) on the Red Planet on Feb. 18 as the spacecraft plummeted, parachuted, and rocketed toward the surface of Mars. A microphone on the rover also has provided the first audio recording of sounds from Mars.

From the moment of parachute inflation, the camera system covers the entirety of the descent process, showing some of the rover's intense ride to Mars' Jezero Crater. The footage from high-definition cameras aboard the spacecraft starts 7 miles (11 kilometers) above the surface, showing the supersonic deployment of the most massive parachute ever sent to another world, and ends with the rover's touchdown in the crater.

A microphone attached to the rover did not collect usable data during the descent, but the commercial off-the-shelf device survived the highly dynamic descent to the surface and obtained sounds from Jezero Crater on Feb. 20. About 10 seconds into the 60-second recording, a Martian breeze is audible for a few seconds, as are mechanical sounds of the rover operating on the surface.

"For those who wonder how you land on Mars -- or why it is so difficult -- or how cool it would be to do so -- you need look no further," said acting NASA Administrator Steve Jurczyk. "Perseverance is just getting started, and already has provided some of the most iconic visuals in space exploration history. It reinforces the remarkable level of engineering and precision that is required to build and fly a vehicle to the Red Planet."

Also released Monday was the mission's first panorama of the rover's landing location, taken by the two Navigation Cameras located on its mast. The six-wheeled robotic astrobiologist, the fifth rover the agency has landed on Mars, currently is undergoing an extensive checkout of all its systems and instruments.

"This video of Perseverance's descent is the closest you can get to landing on Mars without putting on a pressure suit," said Thomas Zurbuchen, NASA associate administrator for science. "It should become mandatory viewing for young women and men who not only want to explore other worlds and build the spacecraft that will take them there, but also want to be part of the diverse teams achieving all the audacious goals in our future."

The world's most intimate view of a Mars landing begins about 230 seconds after the spacecraft entered the Red Planet's upper atmosphere at 12,500 mph (20,100 kph). The video opens in black, with the camera lens still covered within the parachute compartment. Within less than a second, the spacecraft's parachute deploys and transforms from a compressed 18-by-26 inch (46-by-66 centimeter) cylinder of nylon, Technora, and Kevlar into a fully inflated 70.5-foot-wide (21.5-meter-wide) canopy -- the largest ever sent to Mars. The tens of thousands of pounds of force that the parachute generates in such a short period stresses both the parachute and the vehicle.

"Now we finally have a front-row view to what we call 'the seven minutes of terror' while landing on Mars," said Michael Watkins, director of NASA's Jet Propulsion Laboratory in Southern California, which manages the mission for the agency. "From the explosive opening of the parachute to the landing rockets' plume sending dust and debris flying at touchdown, it's absolutely awe-inspiring."

The video also captures the heat shield dropping away after protecting Perseverance from scorching temperatures during its entry into the Martian atmosphere. The downward view from the rover sways gently like a pendulum as the descent stage, with Perseverance attached, hangs from the back shell and parachute. The Martian landscape quickly pitches as the descent stage -- the rover's free-flying "jetpack," which decelerates using rocket engines and then lowers the rover on cables to the surface -- breaks free, its eight thrusters engaging to put distance between it and the now-discarded back shell and the parachute.

Then, 80 seconds and 7,000 feet (2,130 meters) later, the cameras capture the descent stage performing the sky crane maneuver over the landing site -- the plume of its rocket engines kicking up dust and small rocks that have likely been in place for billions of years.

"We put the EDL camera system onto the spacecraft not only for the opportunity to gain a better understanding of our spacecraft's performance during entry, descent, and landing, but also because we wanted to take the public along for the ride of a lifetime -- landing on the surface of Mars," said Dave Gruel, lead engineer for Mars 2020 Perseverance's EDL camera and microphone subsystem at JPL. "We know the public is fascinated with Mars exploration, so we added the EDL Cam microphone to the vehicle because we hoped it could enhance the experience, especially for visually-impaired space fans, and engage and inspire people around the world."

The footage ends with Perseverance's aluminum wheels making contact with the surface at 1.61 mph (2.6 kph), and then pyrotechnically fired blades sever the cables connecting it to the still-hovering descent stage. The descent stage then climbs and accelerates away in the preplanned flyaway maneuver.

"If this were an old Western movie, I'd say the descent stage was our hero riding slowly into the setting Sun, but the heroes are actually back here on Earth," said Matt Wallace, Mars 2020 Perseverance deputy project manager at JPL. "I've been waiting 25 years for the opportunity to see a spacecraft land on Mars. It was worth the wait. Being able to share this with the world is a great moment for our team."

Five commercial off-the-shelf cameras located on three different spacecraft components collected the imagery. Two cameras on the back shell, which encapsulated the rover on its journey, took pictures of the parachute inflating. A camera on the descent stage provided a downward view -- including the top of the rover -- while two on the rover chassis offered both upward and downward perspectives.

The rover team continues its initial inspection of Perseverance's systems and its immediate surroundings. Monday, the team will check out five of the rover's seven instruments and take the first weather observations with the Mars Environmental Dynamics Analyzer instrument. In the coming days, a 360-degree panorama of Jezero by the Mastcam-Z should be transmitted down, providing the highest resolution look at the road ahead.

More About the Mission

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.

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.

Read more at Science Daily

First black hole ever detected is more massive than we thought

 New observations of the first black hole ever detected have led astronomers to question what they know about the Universe's most mysterious objects.

Published today in the journal Science, the research shows the system known as Cygnus X-1 contains the most massive stellar-mass black hole ever detected without the use of gravitational waves.

Cygnus X-1 is one of the closest black holes to Earth. It was discovered in 1964 when a pair of Geiger counters were carried on board a sub-orbital rocket launched from New Mexico.

The object was the focus of a famous scientific wager between physicists Stephen Hawking and Kip Thorne, with Hawking betting in 1974 that it was not a black hole. Hawking conceded the bet in 1990.

In this latest work, an international team of astronomers used the Very Long Baseline Array -- a continent-sized radio telescope made up of 10 dishes spread across the United States -- together with a clever technique to measure distances in space.

"If we can view the same object from different locations, we can calculate its distance away from us by measuring how far the object appears to move relative to the background," said lead researcher, Professor James Miller-Jones from Curtin University and the International Centre for Radio Astronomy Research (ICRAR).

"If you hold your finger out in front of your eyes and view it with one eye at a time, you'll notice your finger appears to jump from one spot to another. It's exactly the same principle."

"Over six days we observed a full orbit of the black hole and used observations taken of the same system with the same telescope array in 2011," Professor Miller-Jones said. "This method and our new measurements show the system is further away than previously thought, with a black hole that's significantly more massive."

Co-author Professor Ilya Mandel from Monash University and the ARC Centre of Excellence in Gravitational Wave Discovery (OzGrav) said the black hole is so massive it's actually challenging how astronomers thought they formed.

"Stars lose mass to their surrounding environment through stellar winds that blow away from their surface. But to make a black hole this heavy, we need to dial down the amount of mass that bright stars lose during their lifetimes" he said.

"The black hole in the Cygnus X-1 system began life as a star approximately 60 times the mass of the Sun and collapsed tens of thousands of years ago," he said. "Incredibly, it's orbiting its companion star -- a supergiant -- every five and a half days at just one-fifth of the distance between the Earth and the Sun.

"These new observations tell us the black hole is more than 20 times the mass of our Sun -- a 50 per cent increase on previous estimates."

Xueshan Zhao is a co-author on the paper and a PhD candidate studying at the National Astronomical Observatories -- part of the Chinese Academy of Sciences (NAOC) in Beijing.

"Using the updated measurements for the black hole's mass and its distance away from Earth, I was able to confirm that Cygnus X-1 is spinning incredibly quickly -- very close to the speed of light and faster than any other black hole found to date," she said.

"I'm at the beginning of my research career, so being a part of an international team and helping to refine the properties of the first black hole ever discovered has been a great opportunity."

Next year, the world's biggest radio telescope -- the Square Kilometre Array (SKA) -- will begin construction in Australia and South Africa.

"Studying black holes is like shining a light on the Universe's best kept secret -- it's a challenging but exciting area of research," Professor Miller-Jones said.

"As the next generation of telescopes comes online, their improved sensitivity reveals the Universe in increasingly more detail, leveraging decades of effort invested by scientists and research teams around the world to better understand the cosmos and the exotic and extreme objects that exist.

Read more at Science Daily

Psychological 'signature' for the extremist mind uncovered

 Researchers have mapped an underlying "psychological signature" for people who are predisposed to holding extreme social, political or religious attitudes, and support violence in the name of ideology.

A new study suggests that a particular mix of personality traits and unconscious cognition -- the ways our brains take in basic information -- is a strong predictor for extremist views across a range of beliefs, including nationalism and religious fervour.

These mental characteristics include poorer working memory and slower "perceptual strategies" -- the unconscious processing of changing stimuli, such as shape and colour -- as well as tendencies towards impulsivity and sensation seeking.

This combination of cognitive and emotional attributes predicts the endorsement of violence in support of a person's ideological "group," according to findings published today in Philosophical Transactions of the Royal Society B.

The study also maps the psychological signatures that underpin fierce political conservatism, as well as "dogmatism": people who have a fixed worldview and are resistant to evidence.

Psychologists found that conservatism is linked to cognitive "caution": slow-and-accurate unconscious decision-making, compared to the fast-and-imprecise "perceptual strategies" found in more liberal minds.

Brains of more dogmatic people are slower to process perceptual evidence, but they are more impulsive personality-wise. The mental signature for extremism across the board is a blend of conservative and dogmatic psychologies.

Researchers from the University of Cambridge say that, while still in early stages, this research could help to better identify and support people most vulnerable to radicalisation across the political and religious spectrum.

Approaches to radicalisation policy mainly rely on basic demographic information such as age, race and gender. By adding cognitive and personality assessments, the psychologists created a statistical model that is between four and fifteen times more powerful at predicting ideological worldviews than demographics alone.

"I'm interested in the role that hidden cognitive functions play in sculpting ideological thinking," said Dr Leor Zmigrod, lead author from Cambridge's Department of Psychology.

"Many people will know those in their communities who have become radicalised or adopted increasingly extreme political views, whether on the left or right. We want to know why particular individuals are more susceptible."

"By examining 'hot' emotional cognition alongside the 'cold' unconscious cognition of basic information processing we can see a psychological signature for those at risk of engaging with an ideology in an extreme way," Zmigrod said.

"Subtle difficulties with complex mental processing may subconsciously push people towards extreme doctrines that provide clearer, more defined explanations of the world, making them susceptible to toxic forms of dogmatic and authoritarian ideologies."

The research is published as part of a special issue of the Royal Society journal dedicated to "the political brain" compiled and co-edited by Zmigrod.

It is the latest in a series of studies by Zmigrod investigating the relationship between ideology and cognition. She has previously published findings on links between cognitive "inflexibility" and religious extremism, willingness to self-sacrifice for a cause, and a vote for Brexit.

A 2019 study by Zmigrod showed that this cognitive inflexibility is found in those with extreme attitudes on both the far right and far left of the political divide.

The latest research builds on work from Stanford University in which hundreds of study participants performed 37 different cognitive tasks and took 22 different personality surveys in 2016 and 2017.

Zmigrod and colleagues, including Cambridge psychologist Professor Trevor Robbins, conducted a series of follow-up tests in 2018 on 334 of the original participants, using a further 16 surveys to determine attitudes and strength of feeling towards various ideologies.

Political conservatism and nationalism was related to "caution" in unconscious decision-making, as well as "temporal discounting" -- when rewards are seen to lose value if delayed -- and slightly reduced strategic information processing in the cognitive domain.

Personality traits for conservatism and nationalism included greater goal-directedness, impulsivity and reward sensitivity, and reduced social risk-taking. Demographics alone had a predictive power of less than 8% for these ideologies, but adding the psychological signature boosted it to 32.5%.

Dogmatism was linked to reduced speed of perceptual "evidence accumulation," and reduced social risk-taking and agreeableness but heightened impulsivity and ethical risk-taking in the personality domain. Religiosity was cognitively similar to conservatism, but with higher levels of agreeableness and "risk perception."

Adding the psychological signatures to demographics increased the predictive power for dogmatism from 1.53% to 23.6%, and religiosity from 2.9% to 23.4%.

Across all ideologies investigated by the researchers, people who endorsed "extreme pro-group action," including ideologically-motivated violence against others, had a surprisingly consistent psychological profile.

The extremist mind -- a mixture of conservative and dogmatic psychological signatures -- is cognitively cautious, slower at perceptual processing and has a weaker working memory. This is combined with impulsive personality traits that seek sensation and risky experiences.

Added Zmigrod: "There appear to be hidden similarities in the minds of those most willing to take extreme measures to support their ideological doctrines. Understanding this could help us to support those individuals vulnerable to extremism, and foster social understanding across ideological divides."

Study participants were all from the United States, 49.4% were female, and ages ranged from 22-63.

Part of the study used tests of "executive functions" that help us to plan, organise and execute tasks e.g. restacking coloured disks to match guidelines, and keeping a series of categorised words in mind as new ones are added.

Additionally, results from various rapid decision-making tests -- switching between visual stimuli based on evolving instructions, for example -- were fed into computational models, allowing analyses of small differences in perceptual processing.

Researchers took the results of the in-depth, self-reported personality tests and boiled them down to 12 key factors ranging from goal-directedness and emotional control to financial risk-taking.

The examination of social and political attitudes took in a host of ideological positions including patriotism, religiosity and levels of authoritarianism on the left and right.

Read more at Science Daily

Dogs synchronize their behavior with children, but not as much as with adults, study finds

 Dogs synchronize their behavior with the children in their family, but not as much as they do with adults, a new study from Oregon State University researchers found.

The findings are important because there is a growing body of evidence that dogs can help children in many ways, including with social development, increasing physical activity, managing anxiety or as a source of attachment in the face of changing family structures, the researchers said. Yet, very little research has focused on how dogs perceive and socially engage with children.

"The great news is that this study suggests dogs are paying a lot of attention to the kids that they live with," said Oregon State animal behaviorist Monique Udell, the lead author of the study. "They are responsive to them and, in many cases, behaving in synchrony with them, indicators of positive affiliation and a foundation for building strong bonds.

"One interesting thing we have observed is that dogs are matching their child's behavior less frequently than what we have seen between dogs and adult caretakers, which suggests that while they may view children as social companions, there are also some differences that we need to understand better."

The paper was recently published in the journal Animal Cognition. Co-authors were Shelby Wanser, a faculty research assistant in Udell's lab, and Megan MacDonald, an associate professor in Oregon State's College of Public Health and Human Sciences, who studies how motor skills and physically active lifestyles improve the lives of children with and without disabilities

The researchers recruited 30 youth between the ages of 8 and 17 years old -- 83% of which had a developmental disability -- to take part in the study with their family dog. The experiments took place in a large empty room. Color-coded taped lines were placed on the floor, and the children were given instructions on how to walk the lines in a standardized way with their off-leash dog.

The researchers videotaped the experiments and analyzed behavior based on three things: (1) activity synchrony, which means how much time the dog and child were moving or stationary at the same time; (2) proximity, or how much time the dog and child were within 1 meter of each other; and (3) orientation, how much time the dog was oriented in the same direction as the child.

They found that dogs exhibited behavioral synchronization with the children at a higher rate than would be expected by chance for all three variables. During their assessments, they found:
 

• Active synchrony for an average of 60.2% of the time. Broken down further, the dogs were moving an average of 73.1% of the time that the children were moving and were stationary an average of 41.2% of the time the children were stationary.
• Proximity within 1 meter of each other for an average of 27.1% of the time.
• Orientation in the same direction for an average of 33.5% of the time.

While child-dog synchrony occurred more often that what would be expected by chance, those percentages are all lower than what other researchers have found when studying interactions between dogs and adults in their household. Those studies found "active synchrony" 81.8% of the time, but at 49.1% with shelter dogs. They found "proximity" 72.9% of the time and 39.7% with shelter dogs. No studies on dog-human behavioral synchronization have previously assessed body orientation.

The Oregon State researchers are conducting more research to better understand factors that contribute to differences in levels of synchrony and other aspects of bond quality between dogs and children compared to dogs and adults, including participation in animal assisted interventions and increasing the child's responsibility for the dog's care.

While research has found dogs can have a lot of positive impacts on a child's life, there are also risks associated with the dog-child relationship, the researchers said. For example, other studies have found dogs are more apt to bite children versus adults.

"We still have a lot to learn about the dog-child relationship" Udell said. "We're hoping this research can inform the best ways to shape positive outcomes and mitigate risks by helping children interact with dogs in a manner that improves the relationship and ultimately the welfare of both individuals."

Read more at Science Daily

Advancing understanding of hop genome to aid brewers, medical researchers

 Oregon State University and U.S. Department of Agriculture researchers have significantly expanded the understanding of the hop genome, a development with important implications for the brewing industry and scientists who study the potential medical benefits of hops.

"This research has the unique ability to impact several different fields," said David Hendrix, an associate professor in the Department of Biochemistry and Biophysics and the School of Electrical Engineering and Computer Science at Oregon State. "If you're talking to beer drinkers, they will be excited about the brewing side. If you are talking to the medical field, they are going to be excited about the pharmaceutical potential."

The findings are outlined in a paper just published in the journal The Plant Genome. Hendrix and John Henning, a hop geneticist with the U.S. Department of Agriculture who has an appointment in the Oregon State College of Agricultural Sciences, are co-corresponding authors of the paper.

Demand for hops has surged in recent years as the craft beer industry has grown, fueled by beers, such as India pale ales, that are brewed with a lot of hops. This has led brewers to seek out new varieties of hops. With a better understanding of the hop genome, scientists will have an easier time developing new varieties, which may have qualities such as different flavor profiles or resistance to diseases that infect and damage hop plants.

"This really opens the door wide for breeding hops at the molecular level," Henning said. "We now have a much better understanding of how traits are being controlled and what genes are involved."

Compounds founds in hops are also increasingly of interest to medical researchers. For example, scientists at Oregon State have shown that xanthohumol, a natural flavonoid found in hops, may aid in combating cancer and metabolic syndrome. Knowing more about hop genes and how they are regulated creates potential for better understanding how compounds are produced and finding other hop compounds that could improve people's health.

Hops are part of the Cannabaceae family of plants, which also includes hemp and marijuana. In the just-published paper, the Oregon State researchers found gene structures in the hop genome that were similar to cannabidolic acid synthase, or CBDAS, which produces the precursor structure to CBD, the compound in cannabis plants that has surged in popularity in recent years because of its potential health benefits.

The Oregon State researchers stressed that their finding doesn't necessarily mean that hops produce CBDA, but it raises questions about the potential to identify new genes involved in the production of different compounds associated with flavoring or therapeutic benefit, and the potential to uncover new compounds in hops.

The researchers sequenced the genome of Cascade, a hop cultivar developed by USDA Agricultural Research Service in the 1960s and credited with helping to launch the craft beer movement. It is the second most widely grown hop variety in the United States today.

The United States is the top hop producing country in the world and Washington, Oregon and Idaho account for nearly all the hop acreage in the United States. In 2019, production of hops in the United States was worth more than $600 million.

Other scientists have attempted to sequence the hop genome, but they have had limited success because it is large -- similar in size to the human genome -- and complex, Hendrix said. The current research was made possible in part by new genome sequencing and assembly technology developed by Pacific Biosciences of California.

"The previous genomes were basically broken up," Hendrix said. "They were sequencing a lot of the genes, but they were isolated islands of the genome and they were not really getting the full context of what was going on in those islands. We were able to reveal a more complete and continuous genomic sequence."

In addition to Hendrix and Henning, the lead author on this paper was Lillian K. Padgitt-Cobb and co-authors of the paper are: Jackson Wells, Brent Kronmiller, Justin Elser and Pankaj Jaiswal, all of Oregon State; Daniel Moore of USDA Agricultural Research Service; Sarah B. Kingan, Gregory Concepcion, Paul Peluso and David Rank, all of Pacific Biosciences of California.

Read more at Science Daily

Sewage study shows which countries like to party hard

 Despite deaths and hospitalisations linked to many new psychoactive substances (NPS), an international wastewater study led by the University of South Australia shows just how prevalent 'party pills' and 'bath salts' are in different parts of the world.

In a new paper published in Water Research, the world's most comprehensive wastewater analysis of NPS shows the pattern of designer drug use in the 2019/2020 New Year in 14 sites across Australia, New Zealand, China, The Netherlands, Spain, Italy, Norway and the United States.

UniSA analytical chemist Dr Richard Bade says samples were collected over the New Year in each country and shipped to South Australia for analysis.

More than 200 synthetic drugs across all countries were monitored and 16 substances found.

"Of the eight countries studied, only Norway showed no traces of NPS," he says.

New psychoactive substances (NPS) are a range of drugs that have been designed to mimic established illicit drugs, such as cannabis, cocaine, MDMA and LSD.

"The Netherlands recorded the highest usage, followed by Australia, New Zealand and the United States. Spain, Italy and China had the lowest incidence of designer drug use in cities participating in the study."

N-ethylpentylone, which is known to cause fatalities, was seen in Australia, New Zealand and the US. It has previously been detected in forensic samples and at music festivals in Australia and New Zealand.

Another designer drug called mephedrone (often referred to as drone, M-CAT, White Magic and meow meow), was found only in Australia and New Zealand, with the latter country recording a 20-fold spike in usage on New Year's Eve.

"It is a very powerful drug that produces effects similar to those of cocaine and MDMA and is popular among ecstasy and simulant users in Australia and NZ," Dr Bade says.

The Netherlands recorded traces of six of 10 quantifiable drugs. Seven additional recreational drugs were also identified in the samples after screening.

Of these, ketamine (a human and veterinary anaesthetic) and its metabolite, norketamine, were found in every country.

A newer drug on the market -- eutylone -- was seen in Australia, New Zealand, the US and The Netherlands. Warnings were issued in 2020 that this designer drug was being incorrectly marketed as MDMA in New Zealand due to its visual similarity to the latter. High doses of it have been linked to intense and particularly dangerous side effects.

Traces of mitragynine, a drug involved in almost half of NPS-related deaths in 2019, were found only in the United States.

Another synthetic opioid, acetyl fentanyl, was also restricted to US wastewater samples. It is also linked to high fatalities in that country.

Of all the drugs, methcathinone was detected in seven countries, followed by N- ethylpentylone and 3-MMC (in three countries each).

"What makes the NPS so dangerous is that they were originally sold as legal alternatives to conventional illicit drugs such as ecstasy and cannabis, suggesting they were safe when, in fact, there was very little information about their toxicity," Dr Bade says.

"Governments soon intervened after hospitalisations and fatalities were linked to these class of drugs with some countries enforcing blanket bans. However, despite these bans, NPS are still synthesised, transported and consumed across the world, often with fatal consequences."

Read more at Science Daily

Friends fur life help build skills for life

 A new UBC Okanagan study finds children not only reap the benefits of working with therapy dogs-they enjoy it too.

"Dog lovers often have an assumption that canine-assisted interventions are going to be effective because other people are going to love dogs," says Nicole Harris, who conducted this research while a master's student in the School of Education. "While we do frequently see children improve in therapy dog programs, we didn't have data to support that they enjoyed the time as well."

Harris was the lead researcher in the study that explored how children reacted while participating in a social skill-training program with therapy dogs.

The research saw 22 children from the Okanagan Boys and Girls Club take part in a series of sessions to help them build their social skills. Over six weeks, the children were accompanied by therapy dogs from UBC Okanagan's Building Academic Retention through K9s (BARK) program as they completed lessons.

Each week the children were taught a new skill, such as introducing themselves or giving directions to others. The children would first practice with their assigned therapy dog before running through the exercise with the rest of the group. In the final phase, the children -- accompanied by their new furry friend and volunteer handler -- would practice their new skills with university students located in the building.

"Therapy dogs are often able to reach children and facilitate their growth in surprising ways. We saw evidence of this in the social skills of children when they were paired with a therapy dog," says Dr. John-Tyler Binfet, associate professor in the School of Education and director of BARK. "The dogs helped create a non-threatening climate while the children were learning these new skills. We saw the children practice and hone their social skills with and alongside the dogs."

While the children were learning and practising their new skills, the research team collected data.

"Findings from our observations suggested that canine-assisted social and emotional learning initiatives can provide unique advantages," says Harris. "Our team saw that by interacting with the therapy dogs, the children's moods improved and their engagement in their lessons increased."

In fact, 87 per cent of the team rated the children's engagement level as very or extremely engaged during the sessions.

At the end of the six weeks, Harris interviewed eight children, aged 5 to 11 years old, who regularly attended the sessions. Each child indicated the social skill-training program was an enjoyable and positive experience and the dogs were a meaningful and essential part of the program.

One participant noticed that the children behaved better at the sessions than at their regular after-school care program, and they thought it was because the children liked being around the dogs.

Half of the children mentioned ways that they felt the dogs helped with their emotional well-being, with one participant crediting a dog with helping him "become more responsible and control his silliness."

As a full-time elementary school teacher, Harris notes that schools have become increasingly important in helping students develop social and emotional skills, and this research could contribute to the development of future school-based or after-school programs.

"Dogs have the ability to provide many stress-reducing and confidence-boosting benefits to children," says Harris. "It was really heartwarming to see the impact the program had on the kids."

Read more at Science Daily

Boys who play video games have lower depression risk

 Boys who regularly play video games at age 11 are less likely to develop depressive symptoms three years later, finds a new study led by a UCL researcher.

The study, published in Psychological Medicine, also found that girls who spend more time on social media appear to develop more depressive symptoms.

Taken together, the findings demonstrate how different types of screen time can positively or negatively influence young people's mental health, and may also impact boys and girls differently.

Lead author, PhD student Aaron Kandola (UCL Psychiatry) said: "Screens allow us to engage in a wide range of activities. Guidelines and recommendations about screen time should be based on our understanding of how these different activities might influence mental health and whether that influence is meaningful.

"While we cannot confirm whether playing video games actually improves mental health, it didn't appear harmful in our study and may have some benefits. Particularly during the pandemic, video games have been an important social platform for young people.

"We need to reduce how much time children -- and adults -- spend sitting down, for their physical and mental health, but that doesn't mean that screen use is inherently harmful."

Kandola has previously led studies finding that sedentary behaviour (sitting still) appeared to increase the risk of depression and anxiety in adolescents. To gain more insight into what drives that relationship, he and colleagues chose to investigate screen time as it is responsible for much of sedentary behaviour in adolescents. Other studies have found mixed results, and many did not differentiate between different types of screen time, compare between genders, or follow such a large group of young people over multiple years.

The research team from UCL, Karolinska Institutet (Sweden) and the Baker Heart and Diabetes Institute (Australia) reviewed data from 11,341 adolescents who are part of the Millennium Cohort Study, a nationally representative sample of young people who have been involved in research since they were born in the UK in 2000-2002.

The study participants had all answered questions about their time spent on social media, playing video games, or using the internet, at age 11, and also answered questions about depressive symptoms, such as low mood, loss of pleasure and poor concentration, at age 14. The clinical questionnaire measures depressive symptoms and their severity on a spectrum, rather than providing a clinical diagnosis.

In the analysis, the research team accounted for other factors that might have explained the results, such as socioeconomic status, physical activity levels, reports of bullying, and prior emotional symptoms.

The researchers found that boys who played video games most days had 24% fewer depressive symptoms, three years later, than boys who played video games less than once a month, although this effect was only significant among boys with low physical activity levels, and was not found among girls. The researchers say this might suggest that less active boys could derive more enjoyment and social interaction from video games.

While their study cannot confirm if the relationship is causal, the researchers say there are some positive aspects of video games which could support mental health, such as problem-solving, and social, cooperative and engaging elements.

There may also be other explanations for the link between video games and depression, such as differences in social contact or parenting styles, which the researchers did not have data for. They also did not have data on hours of screen time per day, so they cannot confirm whether multiple hours of screen time each day could impact depression risks.

The researchers found that girls (but not boys) who used social media most days at age 11 had 13% more depressive symptoms three years later than those who used social media less than once a month, although they did not find an association for more moderate use of social media. Other studies have previously found similar trends, and researchers have suggested that frequent social media use could increase feelings of social isolation.

Screen use patterns between boys and girls may have influenced the findings, as boys in the study played video games more often than girls and used social media less frequently.

The researchers did not find clear associations between general internet use and depressive symptoms in either gender.

Senior author Dr Mats Hallgren (Karolinska Institutet) has conducted other studies in adults finding that mentally-active types of screen time, such as playing video games or working at a computer, might not affect depression risk in the way that more passive forms of screen time appear to do.

Read more at Science Daily

How a longevity gene protects brain stem cells from stress

 A gene linked to unusually long lifespans in humans protects brain stem cells from the harmful effects of stress, according to a new study by Weill Cornell Medicine investigators.

Studies of humans who live longer than 100 years have shown that many share an unusual version of a gene called Forkhead box protein O3 (FOXO3). That discovery led Dr. Jihye Paik, associate professor of pathology and laboratory medicine at Weill Cornell Medicine, and her colleagues to investigate how this gene contributes to brain health during aging.

In 2018, Dr. Paik and her team showed that mice who lack the FOXO3 gene in their brain are unable to cope with stressful conditions in the brain, which leads to the progressive death of brain cells. Their new study, published Jan. 28 in Nature Communications, reveals that FOXO3 preserves the brain's ability to regenerate by preventing stem cells from dividing until the environment will support the new cells' survival.

"Stem cells produce new brain cells, which are essential for learning and memory throughout our adult lives," said Dr. Paik, who is also a member of the Sandra and Edward Meyer Cancer Center at Weill Cornell Medicine. "If stem cells divide without control, they get depleted. The FOXO3 gene appears to do its job by stopping the stem cells from dividing until after the stress has passed."

Many challenges like inflammation, radiation or a lack of adequate nutrients can stress the brain. But Dr. Paik and her colleagues looked specifically what happens when brain stem cells are exposed to oxidative stress, which occurs when harmful types of oxygen build up in the body.

"We learned that the FOXO3 protein is directly modified by oxidative stress," she said. This modification sends the protein into the nucleus of the stem cell where it turns on stress response genes.

The resulting stress response leads to the depletion of a nutrient called s-adenosylmethionine (SAM). This nutrient is needed to help a protein called lamin form a protective envelope around the DNA in the nucleus of the stem cell.

"Without SAM, lamin can't form this strong barrier and DNA starts leaking out," she said.

The cell mistakes this DNA for a virus infection, which triggers an immune response called the type-I interferon response. This causes the stem cell to go dormant and stop producing new neurons.

"This response is actually very good for the stem cells because the outside environment is not ideal for newly born neurons," Dr. Paik explained. "If new cells were made in such stressful conditions they would be killed. It's better for stem cells to remain dormant and wait until the stress is gone to produce neurons."

The study may help explain why certain versions of the FOXO3 are linked to extraordinarily long and healthy lives -- they may help people keep a good reserve of brain stem cells. It may also help explain why regular exercise, which boosts FOXO3 helps preserve mental sharpness. But Dr. Paik cautioned it is too early to know whether this new information could be used to create new therapies for brain diseases.

"It could be a double-edged sword," Dr. Paik explained. "Over activating FOXO3 could be very harmful. We don't want to keep this on all the time."

Read more at Science Daily

Touchdown! NASA's Mars Perseverance rover safely lands on Red Planet

 The largest, most advanced rover NASA has sent to another world touched down on Mars Thursday, after a 203-day journey traversing 293 million miles (472 million kilometers). Confirmation of the successful touchdown was announced in mission control at NASA's Jet Propulsion Laboratory in Southern California at 3:55 p.m. EST (12:55 p.m. PST).

Packed with groundbreaking technology, the Mars 2020 mission launched July 30, 2020, from Cape Canaveral Space Force Station in Florida. The Perseverance rover mission marks an ambitious first step in the effort to collect Mars samples and return them to Earth.

"This landing is one of those pivotal moments for NASA, the United States, and space exploration globally -- when we know we are on the cusp of discovery and sharpening our pencils, so to speak, to rewrite the textbooks," said acting NASA Administrator Steve Jurczyk. "The Mars 2020 Perseverance mission embodies our nation's spirit of persevering even in the most challenging of situations, inspiring, and advancing science and exploration. The mission itself personifies the human ideal of persevering toward the future and will help us prepare for human exploration of the Red Planet."

About the size of a car, the 2,263-pound (1,026-kilogram) robotic geologist and astrobiologist will undergo several weeks of testing before it begins its two-year science investigation of Mars' Jezero Crater. While the rover will investigate the rock and sediment of Jezero's ancient lakebed and river delta to characterize the region's geology and past climate, a fundamental part of its mission is astrobiology, including the search for signs of ancient microbial life. To that end, the Mars Sample Return campaign, being planned by NASA and ESA (European Space Agency), will allow scientists on Earth to study samples collected by Perseverance to search for definitive signs of past life using instruments too large and complex to send to the Red Planet.

"Because of today's exciting events, the first pristine samples from carefully documented locations on another planet are another step closer to being returned to Earth," said Thomas Zurbuchen, associate administrator for science at NASA. "Perseverance is the first step in bringing back rock and regolith from Mars. We don't know what these pristine samples from Mars will tell us. But what they could tell us is monumental -- including that life might have once existed beyond Earth."

Some 28 miles (45 kilometers) wide, Jezero Crater sits on the western edge of Isidis Planitia, a giant impact basin just north of the Martian equator. Scientists have determined that 3.5 billion years ago the crater had its own river delta and was filled with water.

The power system that provides electricity and heat for Perseverance through its exploration of Jezero Crater is a Multi-Mission Radioisotope Thermoelectric Generator, or MMRTG. The U.S. Department of Energy (DOE) provided it to NASA through an ongoing partnership to develop power systems for civil space applications.

Equipped with seven primary science instruments, the most cameras ever sent to Mars, and its exquisitely complex sample caching system -- the first of its kind sent into space -- Perseverance will scour the Jezero region for fossilized remains of ancient microscopic Martian life, taking samples along the way.

"Perseverance is the most sophisticated robotic geologist ever made, but verifying that microscopic life once existed carries an enormous burden of proof," said Lori Glaze, director of NASA's Planetary Science Division. "While we'll learn a lot with the great instruments we have aboard the rover, it may very well require the far more capable laboratories and instruments back here on Earth to tell us whether our samples carry evidence that Mars once harbored life."

Paving the Way for Human Missions

"Landing on Mars is always an incredibly difficult task and we are proud to continue building on our past success," said JPL Director Michael Watkins. "But, while Perseverance advances that success, this rover is also blazing its own path and daring new challenges in the surface mission. We built the rover not just to land but to find and collect the best scientific samples for return to Earth, and its incredibly complex sampling system and autonomy not only enable that mission, they set the stage for future robotic and crewed missions."

The Mars Entry, Descent, and Landing Instrumentation 2 (MEDLI2) sensor suite collected data about Mars' atmosphere during entry, and the Terrain-Relative Navigation system autonomously guided the spacecraft during final descent. The data from both are expected to help future human missions land on other worlds more safely and with larger payloads.

On the surface of Mars, Perseverance's science instruments will have an opportunity to scientifically shine. Mastcam-Z is a pair of zoomable science cameras on Perseverance's remote sensing mast, or head, that creates high-resolution, color 3D panoramas of the Martian landscape. Also located on the mast, the SuperCam uses a pulsed laser to study the chemistry of rocks and sediment and has its own microphone to help scientists better understand the property of the rocks, including their hardness.

Located on a turret at the end of the rover's robotic arm, the Planetary Instrument for X-ray Lithochemistry (PIXL) and the Scanning Habitable Environments with Raman & Luminescence for Organics & Chemicals (SHERLOC) instruments will work together to collect data on Mars' geology close-up. PIXL will use an X-ray beam and suite of sensors to delve into a rock's elemental chemistry. SHERLOC's ultraviolet laser and spectrometer, along with its Wide Angle Topographic Sensor for Operations and eNgineering (WATSON) imager, will study rock surfaces, mapping out the presence of certain minerals and organic molecules, which are the carbon-based building blocks of life on Earth.

The rover chassis is home to three science instruments, as well. The Radar Imager for Mars' Subsurface Experiment (RIMFAX) is the first ground-penetrating radar on the surface of Mars and will be used to determine how different layers of the Martian surface formed over time. The data could help pave the way for future sensors that hunt for subsurface water ice deposits.

Also with an eye on future Red Planet explorations, the Mars Oxygen In-Situ Resource Utilization Experiment (MOXIE) technology demonstration will attempt to manufacture oxygen out of thin air -- the Red Planet's tenuous and mostly carbon dioxide atmosphere. The rover's Mars Environmental Dynamics Analyzer (MEDA) instrument, which has sensors on the mast and chassis, will provide key information about present-day Mars weather, climate, and dust.

Currently attached to the belly of Perseverance, the diminutive Ingenuity Mars Helicopter is a technology demonstration that will attempt the first powered, controlled flight on another planet.

Project engineers and scientists will now put Perseverance through its paces, testing every instrument, subsystem, and subroutine over the next month or two. Only then will they deploy the helicopter to the surface for the flight test phase. If successful, Ingenuity could add an aerial dimension to exploration of the Red Planet in which such helicopters serve as a scouts or make deliveries for future astronauts away from their base.

Once Ingenuity's test flights are complete, the rover's search for evidence of ancient microbial life will begin in earnest.

"Perseverance is more than a rover, and more than this amazing collection of men and women that built it and got us here," said John McNamee, project manager of the Mars 2020 Perseverance rover mission at JPL. "It is even more than the 10.9 million people who signed up to be part of our mission. This mission is about what humans can achieve when they persevere. We made it this far. Now, watch us go."

More About the Mission

A primary objective for Perseverance's mission on Mars is astrobiology research, including the search for signs of ancient microbial life. The rover will characterize the planet's geology and past climate and be the first mission to collect and cache Martian rock and regolith, paving the way for human exploration of the Red Planet.

Subsequent NASA missions, in cooperation with ESA, will send spacecraft to Mars to collect these cached 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.

Read more at Science Daily