To my mind, nothing beats the sights of the World’s oceans.
In the past, I spent four years living on a yacht, a Tradewind 33, out in Cyprus. During that time I cruised to Turkey, to Greece, to Algiers, and loved it.
Here’s an extract from World Oceans day website.
Why Earth’s oceans are so important
Earth’s oceans are critical to human survival. Indeed, more than half the oxygen in our atmosphere is generated via photosynthesis by phytoplankton and seaweed in oceans. In addition, millions of people depend on fish and other marine animals for food. Research on some marine organisms has led to the development of new medications. Moreover, ocean currents, known as global conveyor belts, help regulate Earth’s climate.
Sir David Attenborough has produced a film Ocean and the trailer follows:
There is so much more to view on the World Oceans Day website. Please go to it.
A shard of smooth bone etched with irregular marks dating back 20,000 years puzzled archaeologists until they noticed something unique – the etchings, lines like tally marks, may have represented prime numbers. Similarly, a clay tablet from 1800 B.C.E. inscribed with Babylonian numbers describes a number system built on prime numbers.
As the Ishango bone, the Plimpton 322 tablet and other artifacts throughout history display, prime numbers have fascinated and captivated people throughout history. Today, prime numbers and their properties are studied in number theory, a branch of mathematics and active area of research today.
Informally, a positive counting number larger than one is prime if that number of dots can be arranged only into a rectangular array with one column or one row. For example, 11 is a prime number since 11 dots form only rectangular arrays of sizes 1 by 11 and 11 by 1. Conversely, 12 is not prime since you can use 12 dots to make an array of 3 by 4 dots, with multiple rows and multiple columns. Math textbooks define a prime number as a whole number greater than one whose only positive divisors are only 1 and itself.
Math historian Peter S. Rudman suggests that Greek mathematicians were likely the first to understand the concept of prime numbers, around 500 B.C.E.
Around 300 B.C.E., the Greek mathematician and logician Euler proved that there are infinitely many prime numbers. Euler began by assuming that there is a finite number of primes. Then he came up with a prime that was not on the original list to create a contradiction. Since a fundamental principle of mathematics is being logically consistent with no contradictions, Euler then concluded that his original assumption must be false. So, there are infinitely many primes.
The argument established the existence of infinitely many primes, however it was not particularly constructive. Euler had no efficient method to list all the primes in an ascending list.
Prime numbers, when expressed as that number of dots, can be arranged only in a single row or column, rather than a square or rectangle. David Eppstein/Wikimedia Commons
In the middle ages, Arab mathematicians advanced the Greeks’ theory of prime numbers, referred to as hasam numbers during this time. The Persian mathematician Kamal al-Din al-Farisi formulated the fundamental theorem of arithmetic, which states that any positive integer larger than one can be expressed uniquely as a product of primes.
From this view, prime numbers are the basic building blocks for constructing any positive whole number using multiplication – akin to atoms combining to make molecules in chemistry.
Today, primes in this form are called Mersenne primes after the French monk Marin Mersenne. Many of the largest known primes follow this format.
Several early mathematicians believed that a number of the form (2p – 1) is prime whenever p is prime. But in 1536, mathematician Hudalricus Regius noticed that 11 is prime but not (211 – 1), which equals 2047. The number 2047 can be expressed as 11 times 89, disproving the conjecture.
While not always true, number theorists realized that the (2p – 1) shortcut often produces primes and gives a systematic way to search for large primes.
The search for large primes
The number (2p – 1) is much larger relative to the value of p and provides opportunities to identify large primes.
When the number (2p – 1) becomes sufficiently large, it is much harder to check whether (2p – 1) is prime – that is, if (2p – 1) dots can be arranged only into a rectangular array with one column or one row.
Fortunately, Édouard Lucas developed a prime number test in 1878, later proved by Derrick Henry Lehmer in 1930. Their work resulted in an efficient algorithm for evaluating potential Mersenne primes. Using this algorithm with hand computations on paper, Lucas showed in 1876 that the 39-digit number (2127 – 1) equals 170,141,183,460,469,231,731,687,303,715,884,105,727, and that value is prime.
Also known as M127, this number remains the largest prime verified by hand computations. It held the record for largest known prime for 75 years.
Researchers began using computers in the 1950s, and the pace of discovering new large primes increased. In 1952, Raphael M. Robinson identified five new Mersenne primes using a Standard Western Automatic Computer to carry out the Lucas-Lehmer prime number tests.
As computers improved, the list of Mersenne primes grew, especially with the Cray supercomputer’s arrival in 1964. Although there are infinitely many primes, researchers are unsure how many fit the type (2p – 1) and are Mersenne primes.
By the early 1980s, researchers had accumulated enough data to confidently believe that infinitely many Mersenne primes exist. They could even guess how often these prime numbers appear, on average. Mathematicians have not found proof so far, but new data continues to support these guesses.
George Woltman, a computer scientist, founded the Great Internet Mersenne Prime Search, or GIMPS, in 1996. Through this collaborative program, anyone can download freely available software from the GIMPS website to search for Mersenne prime numbers on their personal computers. The website contains specific instructions on how to participate.
GIMPS has now identified 18 Mersenne primes, primarily on personal computers using Intel chips. The program averages a new discovery about every one to two years.
The largest known prime
Luke Durant, a retired programmer, discovered the current record for the largest known prime, (2136,279,841 – 1), in October 2024.
Referred to as M136279841, this 41,024,320-digit number was the 52nd Mersenne prime identified and was found by running GIMPS on a publicly available cloud-based computing network.
This network used Nvidia chips and ran across 17 countries and 24 data centers. These advanced chips provide faster computing by handling thousands of calculations simultaneously. The result is shorter run times for algorithms such as prime number testing.
New and increasingly powerful computer chips have allowed prime-number hunters to find increasingly larger primes. Fritzchens Fritz/Flickr
The Electronic Frontier Foundation is a civil liberty group that offers cash prizes for identifying large primes. It awarded prizes in 2000 and 2009 for the first verified 1 million-digit and 10 million-digit prime numbers.
Large prime number enthusiasts’ next two challenges are to identify the first 100 million-digit and 1 billion-digit primes. EFF prizes of US$150,000 and $250,000, respectively, await the first successful individual or group.
Eight of the 10 largest known prime numbers are Mersenne primes, so GIMPS and cloud computing are poised to play a prominent role in the search for record-breaking large prime numbers.
Large prime numbers have a vital role in many encryption methods in cybersecurity, so every internet user stands to benefit from the search for large prime numbers. These searches help keep digital communications and sensitive information safe.
I find it unbelievable that there are prizes for the first 100 million-digit prime number and also the first 1 billion-digit prime number. It is so far away from my understanding of these numbers that all I can say is: I find it unbelievable!
NASA hasn’t landed humans on Mars yet. But thanks to robotic missions, scientists now know more about the planet’s surface than they did when the movie, The Martian, was released.
Our human knowledge is constantly growing. In many, many directions. Here is a fascinating (well it is to me!) article from The Conversation.
ooOOoo
A decade after the release of ‘The Martian’ and a decade out from the world it envisions, a planetary scientist checks in on real-life Mars exploration
‘The Martian’ protagonist Mark Watney contemplates his ordeal. 20th Century Fox
Andy Weir’s bestselling story “The Martian” predicts that by 2035 NASA will have landed humans on Mars three times, perfected return-to-Earth flight systems and collaborated with the China National Space Administration. We are now 10 years past the Hollywood adaptation’s 2015 release and 10 years shy of its fictional timeline. At this midpoint, Mars exploration looks a bit different than how it was portrayed in “The Martian,” with both more discoveries and more controversy.
Although concepts for crewed missions to Mars have gained popularity, NASA’s actual plans for landing humans on Mars remain fragile. Notably, over the last 10 years, it has been robotic, rather than crewed, missions that have propelled discovery and the human imagination forward.
NASA’s 2023 Moon to Mars Strategy and Objectives Development document lays out the steps the agency was shooting for at the time, to go first to the Moon, and from there to Mars. NASA
Robotic discoveries
Since 2015, satellites and rovers have reshaped scientists’ understanding of Mars. They have revealed countless insights into how its climate has changed over time.
As Earth’s neighbor, climate shifts on Mars also reflect solar system processes affecting Earth at a time when life was first taking hold. Thus, Mars has become a focal point for investigating the age old questions of “where do we come from?” and “are we alone?”
The Opportunity, Curiosity and Perseverance rovers have driven dozens of miles studying layered rock formations that serve as a record of Mars’ past. By studying sedimentary layers – rock formations stacked like layers of a cake – planetary geologists have pieced together a vivid tale of environmental change that dwarfs what Earth is currently experiencing.
Mars was once a world of erupting volcanoes, glaciers, lakes and flowing rivers – an environment not unlike early Earth. Then its core cooled, its magnetic field faltered and its atmosphere drifted away. The planet’s exposed surface has retained signs of those processes ever since in the form of landscape patterns, sequences of layered sediment and mineral mixtures.
Layered sedimentary rocks exposed within the craters of Arabia Terra, Mars, recording ancient surface processes. Photo from the Mars Reconnaissance Orbiter High Resolution Imaging Science Experiment. NASA/JPL/University of Arizona
Arabia Terra
One focus of scientific investigation over the last 10 years is particularly relevant to the setting of “The Martian” but fails to receive mention in the story. To reach his best chance of survival, protagonist Mark Watney, played by Matt Damon, must cross a vast, dusty and crater-pocked region of Mars known as Arabia Terra.
In 2022 and 2023, I, along with colleagues at Northern Arizona University and Johns Hopkins University, published detailed analyses of the layered materials there using imagery from the Mars Reconnaissance Orbiter and Mars Odyssey satellites.
By using infrared imagery and measuring the dimensions of surface features, we linked multiple layered deposits to the same episodes of formation and learned more about the widespread crumbling nature of the terrain seen there today. Because water tends to cement rock tightly together, that loose material indicates that around 3.5 billion years ago, that area had a drying climate.
To make the discussions about this area easier, we even worked with the International Astronomical Union to name a few previously unnamed craters that were mentioned in the story. For example, one that Watney would have driven right by is now named Kozova Crater, after a town in Ukraine.
More to explore
Despite rapid advances in Mars science, many unknowns remain. Scientists still aren’t sure of the precise ages, atmospheric conditions and possible signatures of life associated with each of the different rock types observed on the surface.
For instance, the Perseverance rover recently drilled into and analyzed a unique set of rocks hosting organic – that is, carbon-based – compounds. Organic compounds serve as the building blocks of life, but more detailed analysis is required to determine whether these specific rocks once hosted microbial life.
The in-development Mars Sample Return mission aims to address these basic outstanding questions by delivering the first-ever unaltered fragments of another world to Earth. The Perseverance rover is already caching rock and soil samples, including ones hosting organic compounds, in sealed tubes. A future lander will then need to pick up and launch the caches back to Earth.
Sampling Mars rocks could tell scientists more about the red planet’s past, and whether it could have hosted life.
Once home, researchers can examine these materials with instruments orders of magnitude more sensitive than anything that could be flown on a spacecraft. Scientists stand to learn far more about the habitability, geologic history and presence of any signs of life on Mars through the sample return campaign than by sending humans to the surface.
This perspective is why NASA, the European Space Agency and others have invested some US$30 billion in robotic Mars exploration since the 1960s. The payoff has been staggering: That work has triggered rapid technological advances in robotics, telecommunications and materials science. For example, Mars mission technology has led to better sutures for heart surgery and cars that can drive themselves.
A selfie from NASA’s Perseverance Mars rover with the Ingenuity helicopter, taken with the rover’s extendable arm on April 6, 2021. NASA/JPL-Caltech/MSSS
Calling the red planet home?
Colonizing Mars has a seductive appeal. It’s hard not to cheer for the indomitable human spirit while watching Watney battle dust storms, oxygen shortages and food scarcity over 140 million miles from rescue.
Much of the momentum toward colonizing Mars is now tied to SpaceX and its CEO Elon Musk, whose stated mission to make humanity a “multi-planetary species” has become a sort of rallying cry. But while Mars colonization is romantic on paper, it is extremely difficult to actually carry out, and many critics have questioned the viability of a Mars habitation as a refuge far from Earth.
Now, with NASA potentially facing a nearly 50% reduction to its science budget, the U.S. risks dissolving its planetary science and robotic operations portfolio altogether, including sample return.
Nonetheless, President Donald Trump and Musk have pushed for human space exploration to somehow continue to progress, despite those proposed cuts – effectively sidelining the robotic, science-driven programs that have underpinned all of Mars exploration to date.
Yet, it is these programs that have yielded humanity’s richest insights into the red planet and given both scientists and storytellers like Andy Weir the foundation to imagine what it must be like to stand on Mars’ surface at all.
Nothing to add from yours truly except to say that this quote is highly relevant: “Challenges are what make life interesting and overcoming them is what makes life meaningful.” – Joshua J. Marine
(And this was the result of me looking online for quotes and coming across 50 quotes from USA Today.)
There is more to this topic that many of us do not know.
Photons are massless. They travel at a speed that 99% of us do not really comprehend. But over to Prof. Jarred Roberts who does comprehend the subject.
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Do photons wear out? An astrophysicist explains light’s ability to travel vast cosmic distances without losing energy
My telescope, set up for astrophotography in my light-polluted San Diego backyard, was pointed at a galaxy unfathomably far from Earth. My wife, Cristina, walked up just as the first space photo streamed to my tablet. It sparkled on the screen in front of us.
“That’s the Pinwheel galaxy,” I said. The name is derived from its shape – albeit this pinwheel contains about a trillion stars.
The light from the Pinwheel traveled for 25 million years across the universe – about 150 quintillion miles – to get to my telescope.
My wife wondered: “Doesn’t light get tired during such a long journey?”
Her curiosity triggered a thought-provoking conversation about light. Ultimately, why doesn’t light wear out and lose energy over time?
Let’s talk about light
I am an astrophysicist, and one of the first things I learned in my studies is how light often behaves in ways that defy our intuitions.
The author’s photo of the Pinwheel galaxy. Jarred Roberts
Light is electromagnetic radiation: basically, an electric wave and a magnetic wave coupled together and traveling through space-time. It has no mass. That point is critical because the mass of an object, whether a speck of dust or a spaceship, limits the top speed it can travel through space.
But because light is massless, it’s able to reach the maximum speed limit in a vacuum – about 186,000 miles (300,000 kilometers) per second, or almost 6 trillion miles per year (9.6 trillion kilometers). Nothing traveling through space is faster. To put that into perspective: In the time it takes you to blink your eyes, a particle of light travels around the circumference of the Earth more than twice.
As incredibly fast as that is, space is incredibly spread out. Light from the Sun, which is 93 million miles (about 150 million kilometers) from Earth, takes just over eight minutes to reach us. In other words, the sunlight you see is eight minutes old.
Alpha Centauri, the nearest star to us after the Sun, is 26 trillion miles away (about 41 trillion kilometers). So by the time you see it in the night sky, its light is just over four years old. Or, as astronomers say, it’s four light years away. Imagine – a trip around the world at the speed of light.
With those enormous distances in mind, consider Cristina’s question: How can light travel across the universe and not slowly lose energy?
Actually, some light does lose energy. This happens when it bounces off something, such as interstellar dust, and is scattered about.
But most light just goes and goes, without colliding with anything. This is almost always the case because space is mostly empty – nothingness. So there’s nothing in the way.
When light travels unimpeded, it loses no energy. It can maintain that 186,000-mile-per-second speed forever.
It’s about time
Here’s another concept: Picture yourself as an astronaut on board the International Space Station. You’re orbiting at 17,000 miles (about 27,000 kilometers) per hour. Compared with someone on Earth, your wristwatch will tick 0.01 seconds slower over one year.
That’s an example of time dilation – time moving at different speeds under different conditions. If you’re moving really fast, or close to a large gravitational field, your clock will tick more slowly than someone moving slower than you, or who is further from a large gravitational field. To say it succinctly, time is relative.
Even astronauts aboard the International Space Station experience time dilation, although the effect is extremely small. NASA
Now consider that light is inextricably connected to time. Picture sitting on a photon, a fundamental particle of light; here, you’d experience maximum time dilation. Everyone on Earth would clock you at the speed of light, but from your reference frame, time would completely stop.
That’s because the “clocks” measuring time are in two different places going vastly different speeds: the photon moving at the speed of light, and the comparatively slowpoke speed of Earth going around the Sun.
What’s more, when you’re traveling at or close to the speed of light, the distance between where you are and where you’re going gets shorter. That is, space itself becomes more compact in the direction of motion – so the faster you can go, the shorter your journey has to be. In other words, for the photon, space gets squished.
Which brings us back to my picture of the Pinwheel galaxy. From the photon’s perspective, a star within the galaxy emitted it, and then a single pixel in my backyard camera absorbed it, at exactly the same time. Because space is squished, to the photon the journey was infinitely fast and infinitely short, a tiny fraction of a second.
But from our perspective on Earth, the photon left the galaxy 25 million years ago and traveled 25 million light years across space until it landed on my tablet in my backyard.
And there, on a cool spring night, its stunning image inspired a delightful conversation between a nerdy scientist and his curious wife.
This remark jumped out at me when I first read the article: ‘In the time it takes you to blink your eyes, a particle of light travels around the circumference of the Earth more than twice.’
Vision to Reality: Building a Profitable Vet Clinic
Launching a veterinary clinic is a significant endeavor that requires meticulous planning and strategic decision-making. This venture combines a passion for animal care with the intricacies of managing a successful business. Aspiring clinic owners must navigate several critical steps to lay a strong foundation and ensure operational excellence. Starting your own clinic promises not only to fulfill a dream of helping animals but also to establish a thriving enterprise in the community.
Build a Strong Foundation with an Effective Marketing Strategy
A robust marketing strategy is essential to attract potential clients in the digital era. Establishing a professional online presence through a user-friendly website that details your services, team, and location builds trust among pet owners. Engage actively on social media with regular updates and client testimonials to showcase your expertise and commitment to animal care. Forge partnerships with local pet-related businesses to increase visibility and drive traffic to your clinic, enhancing both your and your partners’ customer bases.
Craft a Clear and Detailed Business Plan
A well-constructed business plan acts as your clinic’s roadmap, detailing your mission, services offered, and the specific target market. Identify your niche early—whether it’s specializing in certain animals or treatments—to attract the appropriate clientele. Include comprehensive financial projections and a marketing budget in your plan to ensure financial preparedness and support your clinic’s promotional activities.
Enhance Your Business Knowledge by Pursuing an MBA
Running a veterinary clinic demands a blend of clinical and business expertise. Pursuing a master’s of business administration online can boost your proficiency in key business areas such as strategy, management, and finance. An MBA not only deepens your understanding of business operations but also enhances leadership skills and self-assessment capabilities. These competencies are essential for balancing the medical and business demands of your clinic, ensuring its long-term success.
Safeguard Your Business with Proper Insurance
Operating a veterinary clinic comes with inherent risks, making comprehensive insurance coverage essential. Essential policies include malpractice insurance to handle legal issues and general liability insurance for accidents on your premises. Property insurance is crucial to protect your clinic’s infrastructure and equipment against unexpected events. Consulting with an insurance expert can ensure that you have thorough coverage to protect against potential financial setbacks.
Invest in High-Quality Veterinary Equipment
Providing top-tier care necessitates investing in high-quality veterinary equipment. Essential tools like X-ray machines, surgical instruments, and lab equipment should be of the highest standard to ensure accurate diagnoses and treatments. Modern technologies, such as digital imaging systems, not only enhance patient care but also improve operational efficiency. While the initial cost may be higher, investing in quality equipment pays off in the long run by boosting efficiency and minimizing errors.
Secure the Necessary Funding for Your Clinic
Securing sufficient funding is critical when starting a veterinary clinic. Estimate your startup costs accurately to understand your financial needs, including equipment, premises, staffing, and marketing. Explore diverse financing options, such as bank loans, private investors, and specialty medical practice loans that might offer favorable terms. Adequate initial funding prevents cash flow problems and supports your clinic’s growth trajectory.
Choose the Right Location for Your Clinic
The location of your clinic is pivotal to its success, necessitating a spot with a high demand for veterinary services. Conduct thorough market research to choose a community rich in pet owners who need your services. Select a location that is accessible, visible, and has ample parking to ensure convenience for your clients. Proximity to complementary services like pet groomers or dog trainers can further enhance client traffic and provide expansion opportunities.
Opening a veterinary clinic is both challenging and rewarding, demanding a careful blend of dedication and strategic foresight. Success in this field not only enhances the well-being of pets but also contributes positively to the local community. It requires ongoing commitment to adapt and grow in a dynamic environment. Ultimately, the fulfillment of running a successful veterinary clinic comes from both the impact on animal health and the achievement of entrepreneurial goals.
Discover the timeless wisdom that dogs offer at Learning from Dogs, where integrity and living in the present are celebrated. Dive into our content and embrace the lessons from our four-legged friends.
Vision to Reality: Building a Profitable Vet Clinic
Launching a veterinary clinic is a significant endeavor that requires meticulous planning and strategic decision-making. This venture combines a passion for animal care with the intricacies of managing a successful business. Aspiring clinic owners must navigate several critical steps to lay a strong foundation and ensure operational excellence. Starting your own clinic promises not only to fulfill a dream of helping animals but also to establish a thriving enterprise in the community.
Build a Strong Foundation with an Effective Marketing Strategy
A robust marketing strategy is essential to attract potential clients in the digital era. Establishing a professional online presence through a user-friendly website that details your services, team, and location builds trust among pet owners. Engage actively on social media with regular updates and client testimonials to showcase your expertise and commitment to animal care. Forge partnerships with local pet-related businesses to increase visibility and drive traffic to your clinic, enhancing both your and your partners’ customer bases.
Craft a Clear and Detailed Business Plan
A well-constructed business plan acts as your clinic’s roadmap, detailing your mission, services offered, and the specific target market. Identify your niche early—whether it’s specializing in certain animals or treatments—to attract the appropriate clientele. Include comprehensive financial projections and a marketing budget in your plan to ensure financial preparedness and support your clinic’s promotional activities.
Enhance Your Business Knowledge by Pursuing an MBA
Running a veterinary clinic demands a blend of clinical and business expertise. Pursuing a master’s of business administration online can boost your proficiency in key business areas such as strategy, management, and finance. An MBA not only deepens your understanding of business operations but also enhances leadership skills and self-assessment capabilities. These competencies are essential for balancing the medical and business demands of your clinic, ensuring its long-term success.
Safeguard Your Business with Proper Insurance
Operating a veterinary clinic comes with inherent risks, making comprehensive insurance coverage essential. Essential policies include malpractice insurance to handle legal issues and general liability insurance for accidents on your premises. Property insurance is crucial to protect your clinic’s infrastructure and equipment against unexpected events. Consulting with an insurance expert can ensure that you have thorough coverage to protect against potential financial setbacks.
Invest in High-Quality Veterinary Equipment
Providing top-tier care necessitates investing in high-quality veterinary equipment. Essential tools like X-ray machines, surgical instruments, and lab equipment should be of the highest standard to ensure accurate diagnoses and treatments. Modern technologies, such as digital imaging systems, not only enhance patient care but also improve operational efficiency. While the initial cost may be higher, investing in quality equipment pays off in the long run by boosting efficiency and minimizing errors.
Secure the Necessary Funding for Your Clinic
Securing sufficient funding is critical when starting a veterinary clinic. Estimate your startup costs accurately to understand your financial needs, including equipment, premises, staffing, and marketing. Explore diverse financing options, such as bank loans, private investors, and specialty medical practice loans that might offer favorable terms. Adequate initial funding prevents cash flow problems and supports your clinic’s growth trajectory.
Choose the Right Location for Your Clinic
The location of your clinic is pivotal to its success, necessitating a spot with a high demand for veterinary services. Conduct thorough market research to choose a community rich in pet owners who need your services. Select a location that is accessible, visible, and has ample parking to ensure convenience for your clients. Proximity to complementary services like pet groomers or dog trainers can further enhance client traffic and provide expansion opportunities.
Opening a veterinary clinic is both challenging and rewarding, demanding a careful blend of dedication and strategic foresight. Success in this field not only enhances the well-being of pets but also contributes positively to the local community. It requires ongoing commitment to adapt and grow in a dynamic environment. Ultimately, the fulfillment of running a successful veterinary clinic comes from both the impact on animal health and the achievement of entrepreneurial goals.
Discover the timeless wisdom that dogs offer at Learning from Dogs, where integrity and living in the present are celebrated. Dive into our content and embrace the lessons from our four-legged friends.
ooOOoo
Opening a vet clinic is well beyond me even though many years ago I was an entrepreneur.
However, one hopes that somewhere a person or two find this very useful.
Want to know whether “talking” dogs like Bunny are for real? When UC San Diego Professor Federico Rossano first saw Bunny’s videos, he was a skeptic. After all, he knows all about the complicated and messy history of animal communication studies – like the woman who tried to teach a dolphin to speak. But after studying these button-pushing pups for years, his team has published some research that will make you rethink just how much dogs are capable of telling us. Federico’s study is still looking for participants! Sign up here: https://cclab.ucsd.edu/pet-cognition-…
Every day, people are constantly learning and forming new memories. When you pick up a new hobby, try a recipe a friend recommended or read the latest world news, your brain stores many of these memories for years or decades.
But how does your brain achieve this incredible feat?
The human brain is made up of billions of nerve cells. These neurons conduct electrical pulses that carry information, much like how computers use binary code to carry data.
These electrical pulses are communicated with other neurons through connections between them called synapses. Individual neurons have branching extensions known as dendrites that can receive thousands of electrical inputs from other cells. Dendrites transmit these inputs to the main body of the neuron, where it then integrates all these signals to generate its own electrical pulses.
It is the collective activity of these electrical pulses across specific groups of neurons that form the representations of different information and experiences within the brain.
For decades, neuroscientists have thought that the brain learns by changing how neurons are connected to one another. As new information and experiences alter how neurons communicate with each other and change their collective activity patterns, some synaptic connections are made stronger while others are made weaker. This process of synaptic plasticity is what produces representations of new information and experiences within your brain.
In order for your brain to produce the correct representations during learning, however, the right synaptic connections must undergo the right changes at the right time. The “rules” that your brain uses to select which synapses to change during learning – what neuroscientists call the credit assignment problem – have remained largely unclear.
Defining the rules
We decided to monitor the activity of individual synaptic connections within the brain during learning to see whether we could identify activity patterns that determine which connections would get stronger or weaker.
To do this, we genetically encoded biosensors in the neurons of mice that would light up in response to synaptic and neural activity. We monitored this activity in real time as the mice learned a task that involved pressing a lever to a certain position after a sound cue in order to receive water.
We were surprised to find that the synapses on a neuron don’t all follow the same rule. For example, scientists have often thought that neurons follow what are called Hebbian rules, where neurons that consistently fire together, wire together. Instead, we saw that synapses on different locations of dendrites of the same neuron followed different rules to determine whether connections got stronger or weaker. Some synapses adhered to the traditional Hebbian rule where neurons that consistently fire together strengthen their connections. Other synapses did something different and completely independent of the neuron’s activity.
Our findings suggest that neurons, by simultaneously using two different sets of rules for learning across different groups of synapses, rather than a single uniform rule, can more precisely tune the different types of inputs they receive to appropriately represent new information in the brain.
In other words, by following different rules in the process of learning, neurons can multitask and perform multiple functions in parallel.
Future applications
This discovery provides a clearer understanding of how the connections between neurons change during learning. Given that most brain disorders, including degenerative and psychiatric conditions, involve some form of malfunctioning synapses, this has potentially important implications for human health and society.
For example, depression may develop from an excessive weakening of the synaptic connections within certain areas of the brain that make it harder to experience pleasure. By understanding how synaptic plasticity normally operates, scientists may be able to better understand what goes wrong in depression and then develop therapies to more effectively treat it.
These findings may also have implications for artificial intelligence. The artificial neural networks underlying AI have largely been inspired by how the brain works. However, the learning rules researchers use to update the connections within the networks and train the models are usually uniform and also not biologically plausible. Our research may provide insights into how to develop more biologically realistic AI models that are more efficient, have better performance, or both.
There is still a long way to go before we can use this information to develop new therapies for human brain disorders. While we found that synaptic connections on different groups of dendrites use different learning rules, we don’t know exactly why or how. In addition, while the ability of neurons to simultaneously use multiple learning methods increases their capacity to encode information, what other properties this may give them isn’t yet clear.
Future research will hopefully answer these questions and further our understanding of how the brain learns.
Our human brains are incredible. Billions of nerve cells. Yet we are still getting to know the science of our brains and as that last sentence was written: “Future research will hopefully answer these questions and further our understanding of how the brain learns.”
But first I want to publish a comment left by me on Tuesday morning.
This is (marginally) beyond my intellect. But I understood sufficient to be amazed by the incredible facts of the vastness of space.
We live just far enough away from the nearest town so that the electric lights do not interfere with the night sky.
When we have a clear moonless night I stand on our rear deck and look up at the stars and become lost, in the sense that I do not think, in gazing and gazing and g….. and g…. and ..
The vastness of space!
Now to the article.
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Abstract: Modern cosmological theories of the 2010s are incredibly precise. Those Lambda Cold Dark Matter (ΛLCDM) theories have a problem: the acceleration of the expansion of the universe computed in our cosmic neighborhood disagrees with the acceleration of the expansion computed using what is viewed as the early universe. It is a question of 73 locally versus 68 early on. But these are accelerations…
Only SQPR has something deep to say about this situation, because in that theory “Dark Energy” augments with time (so the local Hubble constant should be higher than any old one…) .
***
In the first half of the 20C a number of European and US astronomers, including Hubble, a lawyer turned astronomer using the world’s most powerful telescope (in California), established that the universe was expanding. Isolated galaxies, and giant clusters of galaxies, were observed to separate from each other. When Hubble announced the expansion (which had been guessed by some of his European colleagues), he got a number that was so high that the universe was younger than the Sun. That was corrected by Baade, a German astronomer.
***
DARK MATTER:
Meanwhile, in 1933 Fritz Zwicky, a Swiss at Caltech, studying the giant Coma cluster of more than 1,000 galaxies, saw that they were moving too fast for the observed mass, and announced Dunkle Materie, Dark Matter. Nobody liked that, and ignoring it was facilitated by what was viewed as Zwicky’s insufferable, eccentric personality (as all people of exceptional intellect). Fritz also coined the term “supernova” while fostering the concept of neutron stars.(Zwicky also pushed for “Tired Light” theory (which SQPR predicts)… what was viewed as a major irritant by the Big Bangists…)
A generation later, Vera Rubin, an astronomer at Carnegie, confirmed after studying 60 galaxies and Andromeda with a state of the art spectrometer, that, well, the galaxies rotated too much like plates (and not just like vortices)… confirming Zwicky’s Dark Matter. She was not ignored, although a woman and a mother to boot. A major observatory coming on line at high altitude in the Atacama desert bears her name. It’s not called the Zwicky. Maybe Zwicky should have claimed to be a woman?
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DARK ENERGY:
Dark Energy is the name given to whatever is causing the accelerating expansion of the universe. Here’s a quick presentation of what We (Sort of) Know:
In the late 1990s, astronomers studying distant supernovae discovered that the universe’s expansion is speeding up, not slowing down. This was unexpected—gravity, a constant force towards the center of mass (whatever that is!) should be pulling everything together, slowing the expansion down. Something must be pushing it apart (another explanation -not usually considered- would be that gravity weakens over ultra-cosmological distances… as SQPR would have it).
That “something” supposedly pushing galactic clusters apart, is what we call Dark Energy. It’s not directly observed, but, like many things in science, inferred from its effects. How Much of the Universe Is It?
According to the reigning current models (like Lambda-CDM), the universe is roughly: 68% dark energy, 27% dark matter… and 5% regular matter (you, me, stars, planets, etc.)
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What Might Dark Energy Be? There are a few theoriescharacterized by a parcimony of imagination:
Cosmological Constant (Λ) – Einstein originally added this to his equations of general relativity. It represents a constant energy density filling space uniformly. Einstein put it in to prevent the equation representing gravitation in the universe to collapse the universe gravitationally. As a prima donna, he later claimed that to be his “greatest mistake”, as otherwise he, Einstein The Great Again, would have “predicted” the expansion of the universe. In any case, the Cosmological Constant (Λ) explains nothing, it’s just a description of behavior (but supposes a few things one may be able to contradict)..
Quintessence – Turning the constant Λ into a dynamic field, evolving over space and time.
Modified Gravity – Maybe gravity doesn’t work quite the way we think on cosmic scales, and we don’t need a “dark energy” at all. The problem is that the “official” MONDs (MOdified Newtonian Dynamics) were devised to explain Dark Matter in galaxies… But they failed.
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The only proposed theory that is not just a description of behavior, is SQPR, Sub Quantic, Physical Reality.y Is Dark Energy So Weird:
The energy density of dark energy stays constant (or nearly so), even as the universe expands.
This means more space = more dark energy, which further accelerates expansion.
In SQPR this is directly explained by the weakening of gravity as the carrier bosons are ripped apart…Because the Quantum Interaction is not of infinite range…
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73 – 68 = 5… 5 km/s per Megaparsec…Let’s meditate on this. Over a billion years, if we have two objects the distance of which augments at 15,000 km/s. It turns out that affects severely the famed high precision of the age of the universe… which I always took with a bucket of salt…
A higher Hubble constant affects key cosmic stats — assuming a flat universe with ΛCDM (standard model). These numbers are approximate and based on best-fit ΛCDM calculations — exact values depend on details like matter/dark energy density. The difference might not seem huge in light-years, but in cosmology, even a 5% shift is massive — it changes how we model the early universe, galaxy formation, and fundamental physics.
Hubble Constant (H₀) 67 km/s/Mpc (Planck satellite): Age of Universe ~13.8 billion years; Radius of Observable Universe ~46.5 billion light-years; Diameter ~93 BLY
At the higher 73 km/s/Mpc ( from Local data), the age of the universe is only ~13.0 billion years, the observable radius ~43.8 billion light-years, its diameter, ~87.6 BLY
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Astronomy has long led towards new physics. F = ma, the crucial “2nd law” of mechanics was discovered by Buridan, circa 1340 CE, by mentally exploring what happened to a falling body (I read Buridan directly and made that conclusion myself). Then Buridan suggested that his first law (no force, no change of impetus; implicitly considers them to be vectors) implied that planets would keep rotating indefinitely… Then of course there was the synthesis in the 17C from Kepler to Newton… Observing the satellites of Jupiter and their twenty minute delay when they are the furthest from Earth, gave the speed of light..
Supposing that the Quantum Interaction which teleports quantum states does so at finite speed, gives Dark Matter and Dark Energy….
Is a very simple modification… but quite at odds from the way physicists learn Quantum Physics.
Anyway, the mildly called “Hubble Tension” is turning into the “Hubble Crisis”. Good, With enough crises, we may get somewhere…
Patrice Ayme
Please contemplate below with what the scandal started, the Coma Cluster of 1,000+ galaxies… Zwicky computed that the visible mass would have to be multiplied by 400 to hold the cluster together…
Learning from Dogs 
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