Category: People

Our teeth

A recent post from The Conversation reveals all!

I have no excuse for not being better at looking after my teeth, for one of my elder sisters, Corinne, was a dental assistant and when I was in my mid-fifties I moved down to South-West England and bought a home just a few miles from Corinne’s home. Thereafter she looked after my teeth at the dental practice in Totnes.

But I was careless in following Corinne’s advice and it wasn’t until in my seventies, and living in Merlin, Oregon, that I saw the light; so to speak!

Read this!

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Healthy teeth are wondrous and priceless – a dentist explains why and how best to protect them

Healthy teeth are truly priceless. Moncherie/E+ via Getty Images

Samer Zaky, University of Pittsburgh

At an auction in England in 2011, one of John Lennon’s teeth sold for just over US$31,000.

How much are your teeth worth?

Teeth are amazing little miracles. They light up our smiles, we use them to speak and we chew with them more than 600 times at every meal.

Yet, in a society where 1 out of 5 Americans ages 75 and up live without their teeth, many people may not realize that teeth are designed to stay with us for a lifetime.

I’m a dentist and an assistant professor spanning clinical dentistry and craniofacial regeneration research. Researchers like me are still deepening our understanding of tooth development, with the ultimate goal of serving patients with on-demand regrown ones.

In the process, I have developed reverence for natural teeth and for the complex beauty of these biological and mechanical masterpieces.

Designed for lifelong function

The secret of teeth longevity lies in their durability as well as in how they are anchored to the jaw – picture a hammer and its hand grip. For each tooth, durability and anchorage are functions of the complex interface between six different tissues; each alone is a biological marvel.

For anchorage, the cementum, ligament and bone grip the tooth at its root portion that is buried under the gum. The ligament, a soft tissue that is about 0.2 millimeters wide (about the diameter of four hairs), attaches the cementum of the root on one end to the bone of the jaw on the other end. It serves to anchor the tooth as well as to cushion its movement during chewing.

For durability, however, the secret lies in the enamel, dentin and pulp – our focus in this discussion.

An illustration of tooth anatomy
Dentin and pulp are the body and heart of the tooth. Anna Koroleva/iStock via Getty Images

Enamel – the shield

The enamel is the protective shell that covers the visible part of the tooth above the gum. Thanks to its high mineral content, enamel is the hardest tissue in the body. It needs to be, since it acts as a shield against the constant impact of chewing.

Enamel does not contain cells, blood vessels or nerves, so it is nonliving and nonsensitive. Enamel is also non-regenerating. Once destroyed by decay or broken by misuse such as ice chewing, nail biting or bottle opening – or touched by the dental drill – that part of our priceless enamel is gone for good.

Because it interfaces with a germ-laden world, the enamel is also where decay starts. When acid-generating bacteria accumulate on unbrushed or poorly brushed teeth, they readily dissolve the minerals in the enamel.

How bacteria invade the teeth and cause cavities.

Like hair or fingernails, the non-innervated enamel is not sensitive. The decay advances through the 2.5-millimeter thick (tenth of an inch) layer of enamel painlessly. When caught at that phase during a dental checkup visit, the dentist can treat the decay with a relatively conservative filling that hardly compromises the tooth’s structural integrity.

Because of its high mineral content, enamel is stiff. Its lifelong support is provided by the more resilient infrastructure – the dentin.

Dentin and pulp – body and heart

With less mineral content than enamel, dentin is the resilient body of the tooth. It is a living tissue formed of parallel tiny tubes housing fluid and cellular extensions. Both originate from the pulp.

The pulp is the tooth’s soft tissue core. Vastly rich in cells, blood vessels and nerves, it is the life source of the tooth – its heart – and the key to its longevity.

Like smoke detectors communicating with a remote fire station, the cellular extensions within the dentin sense decay as soon as it breaks through the nonsensitive layer of enamel into dentin. Once the extensions communicate the danger signal to the pulp, our tooth sensitivity alarm goes off: The tooth heart is in flames.

The inflamed pulp initiates two protective actions. The first is to secrete an additional layer of dentin to delay the approaching attack. The second is toothache, a call to visit the dentist.

The earlier the visit, the less the drilling and the smaller the filling. If caught in time, most of the tooth’s natural tissues will be preserved and the pulp will likely regain its healthy state. If caught too late, the pulp slowly dies out.

Without its heart, a nonliving tooth has no defense against further decay invasion. Without a hydration source, a dried-out dentin will sooner or later break under the forces of constant chewing. Besides, a tooth that has already lost a significant portion of its natural structure to decay, cavity preparation or root canal instrumentation becomes weak, with limited longevity.

In other words, the tooth is never the same without its heart. Pulpless, the tooth loses its womb-to-tomb endurance and mother nature’s lifelong warranty.

The tooth coming together

More complex – and more precious – than a pearl within an oyster, the formation of a tooth within our jawbone involves layered mineral deposition. As tooth development progresses in a process of ultimate cellular engineering, the cells of the six aforementioned tissues – enamel, dentin, pulp, cementum, ligament and bone – multiply, specialize and mineralize synchronously with each other to form uniquely interlocking interfaces: enamel to dentin, dentin to pulp, cementum to dentin and cementum to ligament to bone.

https://www.youtube.com/embed/xrebAYBnKw0?wmode=transparent&start=0 Tooth development – the ultimate process of cellular engineering.

In a progress akin to 3D printing, the tooth crown grows vertically to full formation. Simultaneously, the root continues its elongation to eventually launch off the crown from within the bone across the gum to appear in the mouth – the event known as teething. It is about that time, around 12 years of age, that our set of adult teeth is complete. These pearls are set to endure a lifetime and are undoubtedly worth preserving.

Save your teeth, visit the dentist

Tooth decay, the most prevalent disease in humans, is both predictable and preventable. The earlier it is caught, the more the tooth integrity can be preserved. Since the process starts painlessly, it is imperative to visit the dentist regularly to keep those insidious germs in check.

During your checkup visit, the dental professional will clean your teeth and check for early decay. If you are diligent with your daily preventive measures, the good news for you will be no news – enough to make anyone smile.

Samer Zaky, Research Assistant Professor in Oral and Craniofacial Sciences, University of Pittsburgh

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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There’s that saying: “No news is good news.”

Stonehenge

A fascinating account of this English site.

Although I was born in London in 1944, as a result of an affair between my father and mother, my father had two daughters with his wife, Maud, and Rhona and Corinne, for they were their names, took me under their wing. In the 50s Maud, Rhona and Corinne all moved to Devon and I started going regularly to Totnes. When I started driving I usually stopped for a break close by Stonehenge so the site has a special interest to me.

So when I saw this article in The Conversation it had to be shared.

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Stonehenge may have aligned with the Moon as well as the Sun

Stonehenge during winter solstice sunset Chuta Kooanantkul/Shutterstock

Fabio Silva, Bournemouth University; Amanda Chadburn, Bournemouth University, and Erica Ellingson, University of Colorado Boulder

When it comes to its connection to the sky, Stonehenge is best known for its solar alignments. Every midsummer’s night tens of thousands of people gather at Stonehenge to celebrate and witness the rising Sun in alignment with the Heel stone standing outside of the circle. Six months later a smaller crowd congregates around the Heel stone to witness the midwinter Sun setting within the stone circle.

But a hypothesis has been around for 60 years that part of Stonehenge also aligns with moonrise and moonset at what is called a major lunar standstill. Although a correlation between the layout of certain stones and the major lunar standstill has been known about for several decades, no one has systematically observed and recorded the phenomenon at Stonehenge.

This is what we are aiming to do in a project bringing together archaeologists, astronomers and photographers from English Heritage, Oxford, Leicester and Bournemouth universities as well as the Royal Astronomical Society.

There is now an abundance of archaeological evidence that indicates the solar alignment was part of the architectural design of Stonehenge. Around 2500 BC, the people who put up the large stones and dug an avenue into the chalk seemed to want to cement the solstice axis into the architecture of Stonehenge.

Archaeological evidence from nearby Durrington Walls, the place where scientists believe the ancient people who visited Stonehenge stayed, indicates that of the two solstices it was the midwinter one that drew the largest crowd.

But Stonehenge includes other elements, such as 56 pits arranged in a circle, an earthwork bank and ditch, and other smaller features such as the four station stones. These are four sarsen stones, a form of silicified sandstone common in Wiltshire, that were carefully placed to form an almost exact rectangle encompassing the stone circle.

Only two of these stones are still there, and they pale in comparison to their larger counterparts as they are only a few feet high. So what could their purpose be?

Aerial view of Stonehenge
Only two of the station stones are still there. Drone Explorer/Shutterstock

Lunar standstill

The rectangle that they form is not just any rectangle. The shorter sides are parallel to the main axis of the stone circle and this may be a clue as to their purpose. The longer sides of the rectangle skirt the outside of the stone circle.

It is these longer sides that are thought to align with the major lunar standstill. If you marked the position of moonrise (or set) over the course of a month you would see that it moves between two points on the horizon. These southern and northern limits of moonrise (or set) change on a cycle of 18.6 years between a minimum and a maximum range – the so-called minor and major lunar standstills, respectively.

The major lunar standstill is a period of about one and a half to two years when the northernmost and southernmost moonrises (or sets) are furthest apart. When this happens the Moon rises (and sets) outside the range of sunrises and sets, which may have imbued this celestial phenomenon with meaning and significance.

Diagram showing Moonrise positions on a horizon.
The range of Moonrise positions on the horizon during minor and major lunar standstills. Fabio Silva, CC BY-NC

The strongest evidence we have for people marking the major lunar standstill comes from the US southwest. The Great House of Chimney Rock, a multi-level complex built by the ancestral Pueblo people in the San Juan National Forest, Colorado, more than 1,000 years ago.

It lies on a ridge that ends at a natural formation of twin rock pillars – an area that has cultural significance to more than 26 native American tribal nations. From the vantage point of the Great House, the Sun will never rise in the gap between the pillars.

However, during a major standstill the Moon does rise between them in awe-inspiring fashion. Excavations unearthed preserved wood that meant researchers could date to the year episodes of construction of the Great House.

Of six cutting dates, four correspond to major lunar standstill years between the years AD1018 and AD1093, indicating that the site was renewed, maintained or expanded on consecutive major standstills.

Returning to southern England, archaeologists think there is a connection between the major lunar standstill and the earliest construction phase of Stonehenge (3000-2500 BC), before the sarsen stones were brought in.

Several sets of cremated human remains from this phase of construction were found in the southeastern part of the monument in the general direction of the southernmost major standstill moonrise, where three timber posts were also set into the bank. It is possible that there was an early connection between the site of Stonehenge and the Moon, which was later emphasised when the station stone rectangle was built.

The major lunar standstill hypothesis, however, raises more questions than it answers. We don’t know if the lunar alignments of the station stones were symbolic or whether people were meant to observe the Moon through them. Neither do we know which phases of the Moon would be more dramatic to witness.

A search for answers

In our upcoming work, we will be trying to answer the questions the major lunar standstill hypothesis raises. It’s unclear whether the Moon would have been strong enough to cast shadows and how they would have interacted with the other stones. We will also need to check whether the alignments can still be seen today or if they are blocked by woods, traffic and other features.

The Moon will align with the station stone rectangle twice a month from about February 2024 to November 2025, giving us plenty of opportunities to observe this phenomenon in different seasons and phases of the Moon.

To bring our research to life, English Heritage will livestream the southernmost Moonrise in June 2024, and host a series of events throughout the year, including talks, a pop-up planetarium, stargazing and storytelling sessions.

Across the Atlantic, our partners at the US Forest Service are developing educational materials about the major lunar standstill at Chimney Rock National Monument. This collaboration will result in events showcasing and debating the lunar alignments at both Stonehenge and at Chimney Rock.

Fabio Silva, Senior Lecturer in Archaeological Modelling, Bournemouth University; Amanda Chadburn, Member of Kellogg College, University of Oxford and Visiting Fellow in Archaeology, Bournemouth University, and Erica Ellingson, Professor in Astrophysics, Emeritus, University of Colorado Boulder

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Well I learnt something from this, which just goes to show that we are never too old to learn.

To come back to the article, the skills of those ancient peoples were just awe-inspiring.

We humans!

No clear reaction comes to mind.

I came across this post yesterday and thought that it would make a good article for today. But the truth is that I, and I expect many other readers, do not understand the article.

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Employees Heartbroken When They See Someone Tied To ‘Do Not Abandon Animals’ Sign

She waited there 11 hours 💔

By Caitlin Jill Anders, Published on the 11th April, 2024.

Outside the front door of the Harbor Humane Society sits a sign. “Do not abandon an animal here,” the sign reads. “Wait until business hours. No fee for bringing an animal to HHS. For the sake of the animal, please be humane.” An older, outdated version of the same sign sits at the back of the shelter, too, near some picnic tables where employees can take a break. When they arrived at work one morning recently, there were no animals waiting for them out front.

Harbor Humane Society

Sadly, the same could not be said for the sign in the back.

Tied to the base of the “do not abandon animals” sign was a tiny dog who had been abandoned there the night before. Security footage showed the dog, later named Trixie, had been tied to the sign around 9 p.m. and wasn’t found until 7:30 a.m. the next morning, meaning she’d waited there for 11 hours.

Harbor Humane Society

“Our team member was just about to unarm the building (had just arrived to start their morning shift) when she noticed the dog tied to the signpost near our intake door located toward the back side of the shelter,” Jen Nuernberg, director of marketing and strategic initiatives at Harbor Humane Society, told The Dodo. “Initially, she was nervous and scared, barking at her. But once she crouched down and gave her some time, she quickly warmed up and crawled right into her lap. She has been very friendly ever since!”

Harbor Humane Society

Trixie was terrified out there all alone, wondering why she’d ended up there. As soon as she met her rescuer, though, all was well. She was rushed inside and eventually met the rest of the staff members, who were just as heartbroken by the situation. Thankfully, Trixie seemed to be pretty healthy, just a little confused — as was everyone at the shelter.

“When someone abandons an animal without any information, we are just left to guess,” Jen Self Aulgur, executive director at Harbor Humane Society, told The Dodo. “So we can assume she is about 3 to 4 years old, but we don’t know her story, her name, her likes, her favorite treats or toys. This is all information we try to get on animals when they are surrendered to the shelter.”

Harbor Humane Society

The shelter employees are still hoping someone might come forward to give them some information about Trixie before she’s adopted, just to make sure she’s getting the best care possible.

“This pup deserves to have her story and history known,” Self Aulgur said. “We do not want to shame or get you in trouble — we just want to help this poor pup.”

Harbor Humane Society

Trixie is safe now and will be available for adoption in about a week or so. Until then, she’s getting as many kisses and cuddles as the staff can give her while she dreams of her loving forever family.

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Let me add my wishes to the Harbor Humane Society in hoping that very soon Trixie will be adopted by that loving family.

A tribute to Julie Christie

Just a fabulous video!

There were so many things that I could have written about for today but they were all swept aside by an email that came in from an old friend of mine, Chris Snuggs.

Chris and I go back many years to the time when I was a visiting teacher at Isuga in France.

But the point of this post is to share the video that Chris provided about Julie Christie. Here is the first part of a WikiPedia article:

Julie Frances Christie (born 14 April 1940)[1] is a British actress. An icon of the Swinging Sixties, Christie is the recipient of numerous accolades including an Academy Award, a BAFTA Award, a Golden Globe, and a Screen Actors Guild Award. She has appeared in six films ranked in the British Film Institute‘s BFI Top 100 British films of the 20th century, and in 1997, she received the BAFTA Fellowship for lifetime achievement.

Now to the video:

Fantastic!

To state the obvious, it’s in the numbers!

A wonderful, and educational, item on The Conversation.

I was listening to an item on the BBC yesterday morning and counting came up. The need for counting was incredibly early on in our history. Here is a copy of the part of the introduction to The Universal History of Numbers: From Prehistory to the Invention of the Computer.

A riveting history of counting and calculating from the time of the cave dwellers to the late twentieth century, The Universal History of Numbers is the first complete account of the invention and evolution of numbers the world over. As different cultures around the globe struggled with problems of harvests, constructing buildings, educating their citizens, and exploring the wonders of science, each civilization created its own unique and wonderful mathematical system. 

Dubbed the “Indiana Jones of numbers,” Georges Ifrah traveled all over the world for ten years to uncover the little-known details of this amazing story. From India to China, and from Egypt to Chile, Ifrah talked to mathematicians, historians, archaeologists, and philosophers. He deciphered ancient writing on crumbling walls; scrutinized stones, tools, cylinders, and cones; and examined carved bones, elaborately knotted counting strings, and X-rays of the contents of never-opened ancient clay accounting balls. Conveying all the excitement and joy of the process of discovery, Ifrah writes in a delightful storytelling style, recounting a plethora of intriguing and amusing anecdotes along the way.

Now to that article on The Conversation.

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From thousands to millions to billions to trillions to quadrillions and beyond: Do numbers ever end?

The number zero was a relatively recent and crucial addition − it allows numbers to extend in both directions forever. pixel_dreams/iStock via Getty Images Plus

Manil Suri, University of Maryland, Baltimore County

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com.

Why don’t numbers end? – Reyhane, age 7, Tehran, Iran

Here’s a game: Ask a friend to give you any number and you’ll return one that’s bigger. Just add “1” to whatever number they come up with and you’re sure to win.

The reason is that numbers go on forever. There is no highest number. But why? As a professor of mathematics, I can help you find an answer.

First, you need to understand what numbers are and where they come from. You learned about numbers because they enabled you to count. Early humans had similar needs – whether to count animals killed in a hunt or keep track of how many days had passed. That’s why they invented numbers.

But back then, numbers were quite limited and had a very simple form. Often, the “numbers” were just notches on a bone, going up to a couple hundred at most.

How numbers evolved throughout the centuries.

When numbers got bigger

As time went on, people’s needs grew. Herds of livestock had to be counted, goods and services traded, and measurements made for buildings and navigation. This led to the invention of larger numbers and better ways of representing them.

About 5,000 years ago, the Egyptians began using symbols for various numbers, with a final symbol for one million. Since they didn’t usually encounter bigger quantities, they also used this same final symbol to depict “many.”

The Greeks, starting with Pythagoras, were the first to study numbers for their own sake, rather than viewing them as just counting tools. As someone who’s written a book on the importance of numbers, I can’t emphasize enough how crucial this step was for humanity.

By 500 BCE, Pythagoras and his disciples had not only realized that the counting numbers – 1, 2, 3 and so on – were endless, but also that they could be used to explain cool stuff like the sounds made when you pluck a taut string.

Zero is a critical number

But there was a problem. Although the Greeks could mentally think of very large numbers, they had difficulty writing them down. This was because they did not know about the number 0.

Think of how important zero is in expressing big numbers. You can start with 1, then add more and more zeroes at the end to quickly get numbers like a million – 1,000,000, or 1 followed by six zeros – or a billion, with nine zeros, or a trillion, 12 zeros.

It was only around 1200 CE that zero, invented centuries earlier in India, came to Europe. This led to the way we write numbers today.

This brief history makes clear that numbers were developed over thousands of years. And though the Egyptians didn’t have much use for a million, we certainly do. Economists will tell you that government expenditures are commonly measured in millions of dollars.

Also, science has taken us to a point where we need even larger numbers. For instance, there are about 100 billion stars in our galaxy – or 100,000,000,000 – and the number of atoms in our universe may be as high as 1 followed by 82 zeros.

Don’t worry if you find it hard to picture such big numbers. It’s fine to just think of them as “many,” much like the Egyptians treated numbers over a million. These examples point to one reason why numbers must continue endlessly. If we had a maximum, some new use or discovery would surely make us exceed it.

The symbols of math include +, -, x and =.

Exceptions to the rule

But under certain circumstances, sometimes numbers do have a maximum because people design them that way for a practical purpose.

A good example is a clock – or clock arithmetic, where we use only the numbers 1 through 12. There is no 13 o’clock, because after 12 o’clock we just go back to 1 o’clock again. If you played the “bigger number” game with a friend in clock arithmetic, you’d lose if they chose the number 12.

Since numbers are a human invention, how do we construct them so they continue without end? Mathematicians started looking at this question starting in the early 1900s. What they came up with was based on two assumptions: that 0 is the starting number, and when you add 1 to any number you always get a new number.

These assumptions immediately give us the list of counting numbers: 0 + 1 = 1, 1 + 1 = 2, 2 + 1 = 3, and so on, a progression that continues without end.

You might wonder why these two rules are assumptions. The reason for the first one is that we don’t really know how to define the number 0. For example: Is “0” the same as “nothing,” and if so, what exactly is meant by “nothing”?

The second might seem even more strange. After all, we can easily show that adding 1 to 2 gives us the new number 3, just like adding 1 to 2002 gives us the new number 2003.

But notice that we’re saying this has to hold for any number. We can’t very well verify this for every single case, since there are going to be an endless number of cases. As humans who can perform only a limited number of steps, we have to be careful anytime we make claims about an endless process. And mathematicians, in particular, refuse to take anything for granted.

Here, then, is the answer to why numbers don’t end: It’s because of the way in which we define them.

Now, the negative numbers

How do the negative numbers -1, -2, -3 and more fit into all this? Historically, people were very suspicious about such numbers, since it’s hard to picture a “minus one” apple or orange. As late as 1796, math textbooks warned against using negatives.

The negatives were created to address a calculation issue. The positive numbers are fine when you’re adding them together. But when you get to subtraction, they can’t handle differences like 1 minus 2, or 2 minus 4. If you want to be able to subtract numbers at will, you need negative numbers too.

A simple way to create negatives is to imagine all the numbers – 0, 1, 2, 3 and the rest – drawn equally spaced on a straight line. Now imagine a mirror placed at 0. Then define -1 to be the reflection of +1 on the line, -2 to be the reflection of +2, and so on. You’ll end up with all the negative numbers this way.

As a bonus, you’ll also know that since there are just as many negatives as there are positives, the negative numbers must also go on without end!

Hello, curious kids! Do you have a question you’d like an expert to answer? Ask an adult to send your question to CuriousKidsUS@theconversation.com. Please tell us your name, age and the city where you live.

And since curiosity has no age limit – adults, let us know what you’re wondering, too. We won’t be able to answer every question, but we will do our best.

Manil Suri, Professor of Mathematics and Statistics, University of Maryland, Baltimore County

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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This article was written for those a great deal younger than I am. But, to be honest, it is a fascinating account of something so utterly basic to humans and human cognition.

Enjoy!

Picture Parade Four Hundred and Twenty-Seven

And it has to be the 2024 Eclipse.

(With thanks to Unsplash.)

April 8th, 2024

Photo by Jeni Holland on Unsplash

Photo by Luis Olmos on Unsplash

Photo by Nikhil Mitra on Unsplash

Photo by Stephen Walker on Unsplash

Photo by Nikhil Mitra on Unsplash

These are just a few of the photographs available on Unsplash. These and the others are just wonderful.

An article on loneliness

A surprising find!

I shall be 80 in November and I find myself thinking about death more often than I did a few years ago. As an example of how my mind has changed, yesterday I was contemplating renewing my subscription to the Free Inquiry magazine and wondering if I should renew it for two or three years? In other words will I still be alive in three years time? Silly but it is the truth. And that is not taking into account that I go to the Club Northwest two days a week and try and bike ride another two or three times a week.

Then let us not get into the topic of whether I will die before Jean or the reverse. That is an enormous subject and, thank goodness, where we live in Oregon one has the choice to die: “Two states, Oregon and Washington, currently have statutes providing a procedure for a terminally ill patient to request medication to end his or her life. These laws are sometimes referred to as “death with dignity” or “physician-assisted suicide” laws.“

All of which is an introduction to a recent article published in The Conversation that I republish below:

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Loneliness can kill, and new research shows middle-aged Americans are particularly vulnerable

The desire to belong is a fundamental human need. Oliver Rossi/Stone via Getty Images

Frank J. Infurna, Arizona State University

Middle-aged Americans are lonelier than their European counterparts. That’s the key finding of my team’s recent study, published in American Psychologist.

Our study identified a trend that has been evolving for multiple generations, and affects both baby boomers and Gen Xers. Middle-aged adults in England and Mediterranean Europe are not that far behind the U.S. In contrast, middle-aged adults in continental and Nordic Europe reported the lowest levels of loneliness and stability over time.

We used survey data drawn from over 53,000 middle-aged adults from the U.S. and 13 European nations from 2002 to 2020. We tracked their reported changes in loneliness every two years across the midlife years of 45 to 65. This span provided us data from the so-called silent generation of people born between 1937 and 1945; baby boomers, born between 1946 and 1964; and members of Generation X, born between 1965 and 1974.

Our study makes clear that middle-aged Americans today are experiencing more loneliness than their peers in European nations. This coincides with existing evidence that mortality rates are rising for working-age adults in the U.S.

We focused on middle-aged adults for several reasons. Middle-aged adults form the backbone of society by constituting a majority of the workforce. But they also face increasing challenges today, notably greater demands for support from both their aging parents and their children.

Following the Great Recession from late 2007 to 2009, middle-aged adults in the U.S. reported poorer mental and physical health compared to same-aged peers in the 1990s. Compared to several European nations, U.S. middle-aged adults currently report more depressive symptoms and higher rates of chronic illness, pain and disability.

Why it matters

The desire to belong is an innate and fundamental need. When this is lacking, it can have downstream consequences.

Loneliness is bad for your health. Researchers have found that loneliness is as dangerous as smoking. Loneliness increases one’s vulnerability to sickness, depression, chronic illness and premature death.

Loneliness is considered a global public health issue. The U.S. surgeon general released an advisory report in 2023 documenting an epidemic of loneliness and a pressing need to increase social connection. Other nations, such as the U.K. and Japan, have appointed ministers of loneliness to ensure relationships and loneliness are considered in policymaking.

You can be lonely even when surrounded by people.

What still isn’t known

Why are middle-aged Americans exceptional when it comes to loneliness and poorer overall mental and physical health?

We did not directly test this in our study, but in the future we hope to zero in on the factors driving these trends. We think that the loneliness Americans are reporting compared to peer nations comes down to limited social safety nets and to cultural norms that prioritize individualism over community.

Individualization carries psychological costs, such as reductions in social connections and support structures, which are correlates of loneliness. Relative to the other nations in our study, Americans have a higher tendency to relocate, which is associated with weak social and community ties.

One of the reasons why we chose countries from across Europe is that they differ dramatically from the U.S. when it comes to social and economic opportunities and social safety nets. Social and economic inequalities likely increase one’s loneliness through undermining one’s ability to meet basic needs. Generous family and work policies likely lessen midlife loneliness through reducing financial pressures and work-family conflict, as well as addressing health and gender inequities.

Our findings on loneliness in conjunction with previous studies on life expectancy, health, well-being and cognition suggest that being middle-aged in America is a risk factor for poor mental and physical health outcomes.

The Research Brief is a short take on interesting academic work.

Frank J. Infurna, Associate Professor of Psychology, Arizona State University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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And on yesterday afternoon, the Sunday, I went for a bike ride of 22 miles. I loved the ride especially as I listened to music all the way; I have a portable speaker that clips near the front handlebars and plays tracks from my iPhone.

Then there was an article in March from the University of Bristol: “Happiness can be learnt, but we have to work at it – study finds.“

It reads:

Press release issued: 11 March 2024

We can learn to be happy, but only get lasting benefits if we keep practising, a first-of-its-kind study has revealed.

The team behind the University of Bristol’s ‘Science of Happiness’ course had already discovered that teaching students the latest scientific studies on happiness created a marked improvement in their wellbeing.

But their latest study found that these wellbeing boosts are short-lived unless the evidence-informed habits learnt on the course – such as gratitude, exercise, meditation or journaling – are kept up over the long-term.

Senior author Professor Bruce Hood said: “It’s like going to the gym – we can’t expect to do one class and be fit forever. Just as with physical health, we have to continuously work on our mental health, otherwise the improvements are temporary.”

Launched in 2018, the University of Bristol’s Science of Happiness course was the first of its kind in the UK. It involves no exams or coursework, and teaches students what the latest peer-reviewed studies in psychology and neuroscience say really makes us happy.

Students who took the course reported a 10 to 15% improvement in wellbeing. But only those who continued implementing the course learnings maintained that improved wellbeing when they were surveyed again two years on.

Published in the journal Higher Education, it is the first to track wellbeing of students on a happiness course long after they have left the course.

Professor Hood said: “This study shows that just doing a course – be that at the gym, a meditation retreat or on an evidence-based happiness course like ours – is just the start: you must commit to using what you learn on a regular basis.

“Much of what we teach revolves around positive psychology interventions that divert your attention away from yourself, by helping others, being with friends, gratitude or meditating.

“This is the opposite of the current ‘selfcare’ doctrine, but countless studies have shown that getting out of our own heads helps gets us away from negative ruminations which can be the basis of so many mental health problems.”

Professor Hood has distilled the Science of Happiness course into a new book, out on March 10. ‘The Science of Happiness: Seven Lessons for Living Well’ reveals an evidence-informed roadmap to better wellbeing.

The other paper authors are fellow University of Bristol academics Catherine Hobbs and Sarah Jelbert, and Laurie R Santos, a Yale academic whose course inspired Bristol’s Science of Happiness course.

Paper

‘Long‑term analysis of a psychoeducational course on university students’ mental well‑being‘ by Catherine Hobbs, Sarah Jelbert, Laurie R. Santos and Bruce Hood in Higher Education

Further information
  • Surprising take aways from the Science of Happiness course include:
    • Talking to strangers makes us happier, despite a majority of us shying away from such encounters.
    • Social media is not bad for everyone, but it can be bad for those who focus on their reputation.
    • Loneliness impacts on our health by impairing our immune systems.
    • Optimism increases life expectancy.
    • Giving gifts to others activates the reward centres in our brain – often providing more of a happiness boost than spending money on oneself.
    • Sleep deprivation impacts on how well we are liked by others.
    • Walking in nature deactivates part of the brain related to negative ruminations, which are associated with depression.
    • Kindness and happiness are correlated.

I sincerely hope you find today’s post, a long post, of interest.

Our forests

The challenge in deciding what is best for our forests.

As a great many of you already know, we live in a rural area in Southern Oregon. It is a beautiful place and we look out to the East upon Mount Sexton. But locally a great many houses are built on rural sites with the local forest just yards away.

Thus it was with interest that an article on The Conversation website ‘spoke’ to me.

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Fighting every wildfire ensures the big fires are more extreme, and may harm forests’ ability to adapt to climate change

Extreme fires leave forests struggling to recover in a warming world. Mark Kreider

Mark Kreider, University of Montana

In the U.S., wildland firefighters are able to stop about 98% of all wildfires before the fires have burned even 100 acres. That may seem comforting, but decades of quickly suppressing fires has had unintended consequences.

Fires are a natural part of many landscapes globally. When forests aren’t allowed to burn, they become more dense, and dead branches, leaves and other biomass accumulate, leaving more fuel for the next fire. This buildup leads to more extreme fires that are even harder to put out. That’s why land managers set controlled burns and thin forests to clear out the undergrowth.

However, fuel accumulation isn’t the only consequence of fire suppression.

Fire suppression also disproportionately reduces certain types of fire. In a new study, my colleagues and I show how this effect, known as the suppression bias, compounds the impacts of fuel accumulation and climate change.

What happened to all the low-intensity fires?

Most wildfires are low-intensity. They ignite when conditions aren’t too dry or windy, and they can often be quickly extinguished.

The 2% of fires that escape suppression are those that are more extreme and much harder to fight. They account for about 98% of the burned area in a typical year.

The author and colleagues discuss changing wildfire in Montana and Idaho’s Bitterroot Mountains. By Mark Kreider.

In other words, trying to put out all wildfires doesn’t reduce the total amount of fire equally – instead, it limits low-intensity fires while extreme fires still burn. This effect is worsened by climate change.

Too much suppression makes fires more severe

In our study, we used a fire modeling simulation to explore the effects of the fire suppression bias and see how they compared to the effects of global warming and fuel accumulation alone.

Fuel accumulation and global warming both inherently make fires more severe. But over thousands of simulated fires, we found that allowing forests to burn only under the very worst conditions increased fire severity by the same amount as more than a century’s worth of fuel accumulation or 21st-century climate change.

The suppression bias also changes the way plants and animals interact with fire.

By removing low-intensity fires, humans may be changing the course of evolution. Without exposure to low-intensity fires, species can lose traits crucial for surviving and recovering from such events.

After extreme fires, landscapes have fewer seed sources and less shade. New seedlings have a harder time becoming established, and for those that do, the hotter and drier conditions reduce their chance of survival.

In contrast, low-intensity fires free up space and resources for new growth, while still retaining living trees and other biological legacies that support seedlings in their vulnerable initial years.

By quickly putting out low-intensity fires and allowing only extreme fires to burn, conventional suppression reduces the opportunities for climate-adapted plants to establish and help ecosystems adjust to changes like global warming.

Firefighters keep watch for smoke from a fire tower in the Coeur d’Alene National Forest, Idaho, in 1932. Forest Service photo by K. D. Swan

Suppression makes burned area increase faster

As the climate becomes hotter and drier, more area is burning in wildfires. If suppression removes fire, it should help slow this increase, right?

In fact, we found it does just the opposite.

We found that while conventional suppression led to less total area burning, the yearly burned area increased more than three times faster under conventional suppression than under less aggressive suppression efforts. The amount of area burned doubled every 14 years with conventional fire suppression under simulated climate change, instead of every 44 years when low- and moderate-intensity fires were allowed to burn. That raises concerns for how quickly people and ecosystems will have to adapt to extreme fires in the future.

Two charts show fire area increasing faster in a warming climate climate under conventional fire suppression.
With conventional fire suppression, the average fire size will increase faster as the planet warms than it would under a less aggressive approach. Mark Kreider

The fact that the amount of area burned is increasing is undoubtedly driven by climate change. But our study shows that the rate of this increase may also be a result of conventional fire management.

The near total suppression of fires over the last century means that even a little additional fire in a more fire-prone future can create big changes. As climate change continues to fuel more fires, the relative increase in area burned will be much bigger.

This puts more stress on communities as they adapt to increased extreme wildfires, from dealing with more wildfire smoke to even changing where people can live.

A way forward

To address the wildfire crisis, fire managers can be less aggressive in suppressing low- and moderate-intensity fires when it is safe to do so. They can also increase the use of prescribed fire and cultural burning to clear away brush and other fuel for fires.

These low-intensity fires will not only reduce the risk of future extreme fires, but they also will create conditions that favor the establishment of species better suited to the changing climate, thereby helping ecosystems adapt to global warming.

Coexisting with wildfire requires developing technologies and approaches that enable the safe management of wildfires under moderate burning conditions. Our study shows that this may be just as necessary as other interventions, such as reducing the number of fires unintentionally started by human activities and mitigating climate change.

Mark Kreider, Ph.D. Candidate in Forest and Conservation Science, University of Montana

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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The article makes a great deal of sense and presents a solution that may not be our first thought. But especially the message is fundamentally important, and please watch the video because it very clearly presents the benefits of the solution.

So we want more low-intensity fires! Please! Or to say it another way, we want more prescribed fires.

More on our existence.

The Einstein-Freud Letters

I was born in London in November, 1944. Exactly six months before the Second World War ended in April, 1945.

Thus it was of great interest to me that yesterday Jean and I listened to a BBC Radio 4 programme about the letters that were exchanged between two great Jewish men: Einstein and Freud, in 1932. The programme was called Why War? The Einstein-Freud Letters.

The programme ends with offering the listener a fundamental choice, which I won’t spoil for you now. But to me it is an extension of my post (or Patrice’s post) that I published recently on March 19th.

I believe, and hope, you can listen to it by clicking on this link. Here also is the text that is at that link:

In 1932 the world-famous physicist Albert Einstein wrote a public letter to the founder of psychoanalysis, Sigmund Freud. Einstein, a keen advocate of the League of Nations and peace campaigner, asked Freud if he thought war and aggression was forever tied to human psychology and the course of international relations: could we ever secure a lasting world peace? 

Einstein’s letter is deeply prescient, as is Freud’s extraordinary response. The exchange was titled ‘Why War?’. The two thinkers explore the nature of war and peace in politics and in all human life; they think about human nature, the history of warfare and human aggression and the hope represented by the foundation of the League of Nations (precursor to the UN) and its promise of global security and a new architecture of international law. 

At the time of their exchange, Freud is in the last great phase of his career and has already introduced psychoanalysis into the field of politics and society. Einstein, the younger of the two, is using his huge international profile as a physicist for political and pacifist intervention.

For Einstein, future world security means a shared moral understanding across the global order – that humankind rise above the ‘state of nature’ never to devolve into total war again. He wrote to Freud, as ‘a citizen of the world…immune to nationalist bias…I greatly admire your passion to ascertain the truth. You have shown how the aggressive and destructive instincts are bound up in the human psyche with those of love and the lust for life. At the same time, you make manifest your devotion to the goal of liberation from the evils of war…’ Is it possible, Einstein asks Freud, to make us ‘proof against the psychoses of hate and destructiveness?’. Freud’s answer is fascinating and quite unexpected. 

The exchange of letters was sponsored by the International Institute of Intellectual Cooperation, an organisation promoting global security by using prominent thinkers, drawing on multiple fields of knowledge (from science to psychology, politics and law) to achieve a new language for international peace, following the lessons learned from the Great War of 1914-18. 

But even as Einstein wrote to Freud in the summer of 1932, the Nazi party became the largest political party in the German Reichstag. Both men felt a sense of apprehension about what was coming; both were pacifist, both Jewish, both would be driven into exile (both Einsteinian physics and Freudian psychoanalysis were denounced by the new regime). The letters were finally published in 1933 when Hitler came to power, suppressed in Germany, and as a result never achieved the circulation intended for them. 

Featuring readings from the Einstein–Freud letters and contributions from historians of warfare and psychoanalysis, war journalism and global security, this feature showcases the little-known exchange between two of the 20th century’s greatest thinkers, ‘Why War?’ – a question just as relevant in today’s world.

Contributors include historian of war and peace Margaret MacMillan, BBC chief international correspondent Lyse Doucet, defence and security expert Mark Galeotti, historian of international relations Patrick O Cohrs, author Lisa Appignanesi, who has written on Freud and the history of psychoanalysis, and Faisal Devji, historian of conflict and political violence in India and the Middle East. 

Readings are by Elliot Levey (Einstein) and Henry Goodman (Freud) 

Produced by Simon Hollis

A Brook Lapping production for BBC Radio 4

Albert Einstein

Portrait by Ferdinand Schmutzer, 1921

Sigmund Freud

Freud, 1921

Two very great men.

Our human existence!

We are a very strange bunch.

Jean and I live in an ideal part of America: Merlin in Southern Oregon. We did not plan to come here but in 2012 we wanted to move from Payson, Az. and fortune brought us here. However, I started this blog in 2009 when I had seen the integrity and happiness of dogs and wanted to write about them.

However the wider world is far, far from just the integrity and happiness of dogs.

On March 17th Patrice Ayme posted yet another post on his blog about war and I felt that it was important to be read by as many followers of Learning from Dogs as is possible. (The few small typographical changes are mine.)

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Want No War? A Symptom That Nazism Perdures

Do not whine that war is bad. Ask instead what it is for.

Friend of a friend Manfred Krieger: Will mankind ever learn that wars do no good to anyone?

Patrice Ayme: All over the world, the vermin helping Putin claim that war does not do any good. Similarly the Nazis, after claiming for years that they were the party of peace and minorities, accused big bad France of having launched WW2. France did, indeed, but that was after the Nazis had invaded a few countries, including two democracies, and officially killed a few hundred thousands of alleged mental retards and genetically defective (including a relative of Hitler).

Vermin helping Putin vermin has been crawling around the French and German leadership for a quarter of a century. That Putin was a war criminal was obvious as early as 1999. 

The Putinists claim that war never helped anyone. So the war to stop Hitler did not do good to anyone? Only an obdurate Nazi would hold that opinion.

My family was hunted by the Gestapo: I am delighted that more than five million Nazis got exterminated like the vicious vermin they were. It would have been better if the French Republic had declared war on the Nazi gangrene earlier. Destroying the vermin when it was weaker would have saved the lives of in excess of 50 million thoroughly innocent people who got killed as a result of having let the Axis fly from victory to victory, gathering alliances with nearly as equally repulsive tyrannies in the process.

This may well be happening now: the Chinese dictatorship is sitting on a fence, not trying to help the Kremlin tyrant too much. The fascist Iranian theocracy retreated a bit when threatened recently by the West after attacks in the Red Sea, the Gulf of Aden and Syria. 

This hesitancy on the part of fascists also happened in World War Two; for a long time Mussolini did not dare to join Hitler, but then they militarily cooperated attacking Spain and three years later, attacking France. But ultimately, except for Franco who looked degenerate, but was smarter, fellow dictators, even Stalin, sided with the Axis. 

In final analysis, WW2, and also WW1, happened because, primarily, not enough Germans fought the forces of fascist imperialistic plutocracy inside Germany.

So it is a lack of war, not an excess of it, which brought disaster.

That happened because not enough Morally Correct Germans realized in a timely manner that it would do some good to destroy the fascist imperialistic plutocratic mentality. 

None of this deplorable meta-mentality is obsolete; France and Germany encouraged and empowered the Kremlin vermin in the last quarter of a century, by building its economy and financing it with advantageous trade. Now the Kremlin vermin is potentially the greatest threat against humanity and civilization, ever. And what does the German government do? Claim that one should not fight the Kremlin gangrene too much, to not aggravate matters too much.

But that appeasement in face of the unacceptable only encourages the latter. Germans still have to understand the biggest lessons of history.

‘An appeaser is one who feeds the crocodile quality food, hoping

that the ferocious creature will die of indigestion.’

Patrice Ayme

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