Students worldwide study this course at roughly the same age he died. A coincidence that feels strangely poetic. With that in mind, I invite you to discover the story of the young rebel behind that name, a man who faced his era with unyielding conviction. He challenged authority and paid a high price for his ideals: Évariste Galois

⚔️Duel

May 29th, 1832

Évariste Galois knew it was the last night of his life. The young, fiery, and rebellious mathematician knew that, by the next day, he would probably be dead at the age of twenty. He had agreed to face a Captain of the Guard in a duel, and, fully aware of his inferiority and the fatal consequences, he spent the last night of his life writing letters to his relatives.

“Show my work to Jacobi and to Gauss”. -His last letter, to his friend Chevalier

The duel wasn’t born of calm reflection. It was an example of the pride and devotion to duty that marked Galois’s short life. He had a gift for making enemies. The reasons that drove this brilliant student to a duel on the outskirts of Paris still remain a mystery; it may have been a romantic affair or a political act.

The following day, the weapon of the Captain of the Guard, whether a bullet or a blade, tore through the abdomen of Évariste Galois. That mind, as insolent as it was ingenious, was extinguished at 20 years old on that dark morning of 1832. Far too soon.

“Don’t cry, Alfred! I need all my courage to die at twenty” -His last words.

🛡️A man under siege

If I had to define Évariste’s life, I would do so with a single word: Insolence. After his father’s suicide, he inherited a passion for politics and joined the Republicans who overthrew King Charles X in favour of Philippe of Orléans. Unsatisfied with the new king, he offered a very peculiar coronation toast: raising his glass in one hand, brandishing a dagger in the other. Charged with sedition, he was sentenced to six months in prison.

This clash with authority became a recurring theme in his short life. Despite starting out as a promising student, he was eventually expelled from school for his behaviour. Thus, he had to dedicate his life to mastering algebra on his own, relying on nothing and nobody but his inner brilliance.

Frustration marked his path to higher education. Twice he attempted to enter the prestigious École Polytechnique, the heart of French science, and twice he was rejected. It wasn't for lack of knowledge, but a clash of temperaments: Galois solved the complex problems in his head, skipping the intermediate steps that his examiners demanded. Frustrated by what he saw as their mediocrity, he reportedly threw a blackboard eraser at one of them. To the academic elite, he was just an insolent student whose ideas were as incomprehensible as his attitude was unbearable. His arrogance often overshadowed his genius.

He was always a man of conviction. After failing in his academic career, he redirected his intellectual energy toward the revolutionary cause. He unsuccessfully attempted to enlist in the army as part of Poland’s Voluntary Revolutionary Legion.

“Examiners are machines who only know how to ask questions, but do not know how to listen to answers”. -Evariste Galois

🧩The problem

Galois solved a problem that had resisted mathematicians for centuries, and did so with a complete and elegant solution.

He proved that there is no general formula to solve equations of the fifth degree or higher, a mystery that had baffled the greatest minds since the Renaissance. To achieve this, Galois looked beyond the numbers themselves; he focused on the underlying symmetries of their roots. In doing so, he laid the foundation for what we now call Group Theory, changing the landscape of algebra forever by demonstrating that the limits of mathematics are defined by its internal structure.

His work opened entirely new directions in mathematics. Today, the ideas he introduced help describe the behaviour of elementary particles in the Universe and, at the same time, explain the symmetries found in the floors and walls of the Nasrid Palace in the Alhambra of Granada.

In these times when misinformation is everywhere, I will be gathering and updating the different peculiarities of this stellar body, always in favour of objectivity and thus avoiding the sensationalism and opportunism I see in some other media channels.

The goal is that we all have enough information to form a critical opinion so we can enjoy this phenomenon together, regardless of the wild theory that might be living in our heads ;)

👾Anomalies

1) Extra-solar origin

Its path follows Newton’s equations: a hyperbolic trajectory. But unlike other well-described comets we know (Halley, Encke…), this shape is open. It is neither an ellipse nor a circle; it is a Hyperbola. That means the Sun cannot capture it because its speed is too high. Its inertia beats the Sun’s gravity, so it escapes forever.
This tells us something important: it does not belong to our Solar System. It comes from outside, from another star system. That alone makes it extremely interesting, because only three such objects are known: 1I/‘Oumuamua, 2I/Borisov, and itself: 3I/ATLAS.

2) Large size

Like any active comet, it has a solid icy nucleus. As it approaches the Sun, the ice sublimates, forming a gas-and-dust coma.
The coma makes it hard to measure its size, but early estimates suggested ~20 km. Newer observations place it between 300 m and 5 km. For putting it in comparison, it is 5 times the size of 2I/Borisov or 25 times larger than Oumuamua

3) Galactic-centre procendence

Its incoming direction points from the constellation Sagittarius, close to the galactic plane, a region rich in stars. This hints at a possible origin deep in the Milky Way. (There was also mention of a 9% difference with the “Wow!” signal, but the context is unclear.)

4) Extremely high Speed

Around 200,000 km/h, making it the fastest comet ever observed from Earth.

5) Older than the Solar System

And also the oldest object ever seen in the Solar System. It could be as old as 11 billion years, or even more.
For context:

• The Universe is about 13 billion years old

• The Solar System is about 4 billion years old.

• Anything we see within it is at most that age.

So we are talking about an object formed at the dawn of the cosmos, long before we appeared in the Universe. This already gives hints at how strange it might be.

6) Strange trajectory

Its passage through the Solar System is also peculiar because, unlike the other two extragalactic visitors, 3i/ATLAS travels within the plane of the Solar System, also known as the ecliptic, the same plane in which all planets and the Sun lie.
Besides being a great coincidence, it is great luck, because it gives many opportunities to observe and measure it carefully. This is not only because we have more time, but also because it passes close to planets and therefore close to our telescopes spread across the system.

7) Confusing composition

When the composition of this object is analysed, something truly strange appears. It contains only 4% water vapour by mass, and its CO₂ content is much higher than usual, at almost 32%.
A 1:8 CO₂–water ratio like this has been observed only once in the history of Solar System comets. It is highly abnormal and arouses tons of sci-fi theories.

8) Metal composition of the coma

The gas plume above 3I/ATLAS contains much more nickel than iron; a spaceship? I don’t think so, but it is definitely something extremely unusual.

9. Negative polarisation

Negative polarisation was measured before perihelion, a phenomenon not observed in other known comets, including 2I/Borisov.
It is a very narrow and extremely deep curve, as stated by the authors themselves in the paper “Extreme Negative Polarisation of New Interstellar Comet 3I/ATLAS“, written by a large international collaboration.
They openly recognise that they are facing something totally new, never seen before. They suggest it must be a new type of comet, something completely rare and strange compared to what is known so far, almost more similar to a small planet than a comet.

10. Tail behaviour

Usually, a comet has a tail, nothing surprising at all. This is due to the Sun’s rays acting on the comet. It is well known that heat causes ice to sublime, leaving behind a trail of gas and dust.
Well, with ATLAS, something abnormal happened. During July and August, the tail pointed in the opposite direction from usual. Instead of pointing away from the Sun, it pointed toward the Sun, and only later changed and formed the characteristic comet tail we all imagine.

11. Pulses?

There have been some peculiar articles, news posts, and online comments suggesting that ATLAS emits a signal that could be a message to its original planet, as if it’s contacting “home”.
This sounds strange, and in fact, after looking for the original source, nothing has been found. I have no confirmation of this wild feature.

12. Brightness increase

The latest images of 3I/ATLAS, taken before it was hidden by the Sun, show a rapid and remarkable increase in brightness. This was published in a scientific article titled “Rapid Brightening of 3I/ATLAS Before Perihelion”, by scientists at the Lowell Observatory in Arizona, using several instruments: STEREO, SOHO, and GOES, following 3I/ATLAS during September and October. They observed that the brightness intensity had changed by a factor of 5 compared to its value at the beginning of the month.

13. Colour change

Apparently, the object has changed its brightness colour from reddish to greenish, and finally to bluish.

• The reddish tone can be attributed to dust scattering.

• The greenish stage can be explained by the emission of specific gases.

• But the reason why it has now turned blue is not understood at all.

It is a great mystery. This colour might be explained by light refraction or by the object’s temperature. Colours toward the blue imply higher temperatures.

14. Non-gravitational acceleration

There is a possible natural explanation based on Newton’s third law: it might be expelling gases. If sublimation releases gases with a rocket-like effect, the object could accelerate.
How much would it need to lose? We can calculate the mass it would have to shed to produce that acceleration. The estimate is about 5.5 trillion tons lost after passing the Sun. This is a lot, around 15% of its initial mass, something that should be detectable.

Last review: 28/11/2025

To illustrate what I mean, here’s a real conversation I had last week with a university classmate:
→ Him: Hey, I heard that you have a blog. Can I take a look?
→ Me: Of course. *I type the URL on his laptop*
→ Him: *Clicks on two random articles* Wow, looks interesting… but don’t you think you’ve used too much AI?
→ Me: >:(

🐘 The Blue Elephant in the Room

Nowadays, anyone can write a grammatically correct text using AI. Gone are the days when a bad text could be spotted by spelling errors, incoherence, or awkward phrasing. Today, everyone can write something “acceptable,” but behind that correctness, there is nothing more than empty, unneeded words. It is readable, but redundant and lacks content. It seems good, but is not.

That’s where the danger lies. Behind every AI-generated text hides an enormous lack of personality. By design, AI has swallowed so many voices, tones, and writing styles that what comes out is a tasteless average; an algorithmic stew of human expression.

It’s like cooking with too many spices. There’s so much mixed in that you can’t taste anything distinct anymore; you don’t even feel the intention of the cooker.

⚙️ The Problem

I’ve never been a fan of glorifying effort for its own sake. After all, I grew up memorising endless paragraphs and repeating math exercises that led nowhere. It’s an efficient way to classify students by performance, but it kills creativity. It rewards mental horsepower over imagination.

And here’s the paradox: if I had a tool that allowed me to write these articles faster without lowering quality, I’d use it without hesitation. I am the first one who relies on Grammarly or Google Translate to check my English. But that’s where the real mistake begins: believing that automation can create something with charisma.

You only need to open LinkedIn to witness the damage. Scroll for five minutes, and you’ll find endless AI-written posts that look more similar to prompts than real writing. Too many people are “delighted” or “thrilled” to announce something. The space that was once meant to highlight professional achievements is now overrun by parasites chasing likes and followers.

We’re closer than ever to the so-called Dead Internet: a dystopia where columnists and writers disappear, giving way to faceless algorithms. Information no longer lives in Google’s search bar but inside chatboxes of millions of lines of code: a digital oracle with no soul.

AI needs writers, not the other way around. As long as there are passionate writers, there will always be passionate readers -”myself”

⚔️ My Personal Crusade

This personal crusade against AI has two opposite effects on me: one positive, one negative.

The positive one is creativity. I simply can’t afford to write a mediocre article. In a world where anyone with access to AI can produce something passable, I must explore new ideas, new structures, and new messages. That’s how I stay out of the algorithmic crowd.

It also pushes me to design formats that no AI could ever dream of creating. From my Bingos to mock conversations, I keep trying to build something that feels uniquely human.

And above all, this battle has taught me not to fear being myself. Be more humanly, more imperfectly, more me. Anyone can write, but no one can write like me. If I want to be special, I have to show my voice as it is: unpolished, raw, and personal. Without hiding behind synonyms or trying to sound smarter than I am. Without fearing not to be understood.

Yet the shadow of AI is always there. It’s the first and last thing I think whenever I write. It changes how I express myself. I delete generic phrases, switch from neutral tones to personal ones, and sometimes overcorrect just to feel human again.

I’ve adopted British expressions and words (realise instead of realize), I refuse to use “—” in my essays, I use semicolons “;” and I actively avoid words overused by AI (thrilled, delighted, empowered…). I’ve even considered removing emojis from my titles, even though they’ve been part of my blog’s identity since day one.

These changes are neither natural nor comfortable, but they’re necessary. At first impression, I want readers to feel that behind this blog, there’s not an algorithm but a young student made of flesh and bones. A Spanish writer who tries to rediscover literature while sharing his passion for learning.

These were Carl Sagan's first words on the program Cosmos, and these were precisely the words that come to mind when I think about the universe.

🌌A temporal Frontier

When I think about the universe, I imagine something so vast that it feels infinite. Yet only a few centuries ago, many believed the end of the world lay just beyond the Atlantic Ocean, somewhere past the legendary Cabo de Finisterre (curiously close to my city). Then, America was discovered, revealing the New World. And now, centuries have flown by, but we still face another kind of frontier, invisible but very real.

The observable universe extends roughly 46 billion light-years in every direction. Beyond that limit, the cosmos continues, yet becomes forever unreachable. This border is not made of matter or energy; it is made by time.

The reason lies in the universe's accelerated expansion. From the very beginning, the cosmos has not been expanding into something. Instead, space itself stretches. The galaxies are not travelling through space; they are carried by it.

Some galaxies are already so distant that their light will never reach us. The space between them and us expands faster than light can travel across it. This is why astronomers refer to a cosmic bubble. Everything we see, from galaxies and clusters to the faint background radiation, belongs to the portion of the universe whose light has had enough time to reach us since the Big Bang.

🔚The Edges of the Known World

Beyond that bubble, the universe continues, perhaps endlessly, but disconnected from our reality. Even if we waited for eternity, we would never receive a single photon from those distant places. They are, quite literally, beyond existence as we can define it.

“What does it mean to know the universe if all we can ever hold is a fragment of its light?”

However, this bubble is not the same for everyone. If an observer were positioned elsewhere in the cosmos, their own observable universe would be centred on them, enclosing regions we could never see from here.

Every point in space lives inside its own horizon of the visible. If we could instantly travel to a galaxy twenty billion light-years away, we would observe new regions of the universe but also lose others. Knowledge would not grow; it would simply change perspective.

And this horizon keeps changing. With every passing second, the cosmos grows a little more, and some galaxies quietly slip beyond the edge of visibility. They do not disappear; they simply become unreachable, like ships fading into an ocean that grows faster than they can sail.

In the far future, even the closest galaxies will vanish from sight. The night sky will empty, the traces of our origin will fade, and the universe will finally turn silent, infinite, and invisible.

So the only question left is, does curiosity itself have a horizon?

This year, I took it one step further: I MADE A BINGO. I collected the clichés and everything that cannot be missing from a good Nobel ceremony, and I put them in small squares to tick off as the show unfolded. Alea iacta est.

Not even a row, I am not a good guesser for sure ;)

🪐 Between Two Universes

Imagine for a moment that there are two parallel universes separated by an impenetrable barrier. The first is ours; the solid, predictable universe. The world of rocks, planets, and laws we can trust. If you throw a ball, you know exactly where it will land. It is a world that feels real.

But on the other side of the barrier lies a ghostly universe: the quantum world, a place where particles behave like whispers, capable of being in two places at the same time. A realm where crossing walls is not just possible but constantly happening. For a century, physicists could only spy on that world through a tiny keyhole, believing its magic would never touch ours.

But what if I told you that three men did not settle for mere watching. They decided to build a bridge, a door that connects these two parallel universes. That is the true story behind their Nobel Prize. Not just an equation, not just an experiment. A crossing.

🕳️Brief explanation

"For the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit"

In our everyday universe, everything obeys a law we rarely question: if you throw a ball at a wall, it stops. That is classical physics. Predictable. Solid. Like planets orbiting or stones falling, there is no mystery in where things will land.

But in the quantum world, particles behave like waves. And a wave does not end at the wall. It leaks through it. There is a chance — small, but real — that the particle can appear on the other side, without breaking or climbing the barrier. It is neither magic nor teleportation; it is a consequence of probability itself.

Superconductivity is one of those rare states of matter where nature behaves almost too perfectly. When certain materials are cooled to extremely low temperatures, something remarkable happens: their electrical resistance drops to zero. Current can flow forever, without losing energy, without heating, and without friction. It is like turning off gravity for electricity.

In this frozen state, electrons do not move as individuals. They form what physicists call Cooper pairs — a single, unified wave. They stop behaving like particles and start acting like a collective entity that follows quantum rules on a macroscopic scale.

Now imagine taking this perfect supercurrent and interrupting it with a tiny gap. No wire. No bridge. Just a few nanometers of insulating material between two superconductors.

This gap is called a Josephson Junction. According to classical physics, it should stop everything. If electrons cannot pass through a wire, they should halt at the barrier.

And this is what makes the 2025 Nobel so powerful. The laureates did not observe tunnelling in atoms or radioactive decay. They caught it inside a visible circuit, built with human hands. A ghost from the quantum world, leaving a measurable signal in our own.

🎭 A Gala That Left Me Cold

If I had to define this year's gala in one word, it would be depressing. I know it is unfair to compare modern laureates with giants like Dirac, Feynman, or Schrödinger. Physics has changed. That world where solitary minds in remote laboratories uncovered hidden symmetries now exists only in our books. Today, discoveries are made by executives. Main chairs of laboratories with the budget of small nations. Places where imagination has been quietly replaced by publication metrics and institutional clickbait.

“We are fortunate to live in a world where there are still discoveries to be made” - Marie Curie

And since everyone has an opinion, here is mine. The gala was a disaster. Not only because some laureates did not attend, but also because it felt so lifeless. The jury looked aged and absent. The organisation lacked vitality. The only moment of light came from the laureate himself, Martinis. Despite visible nerves at the beginning, he delivered a masterful explanation of his work. Simple, but never trivial. You could feel a life dedicated to understanding.

The worst moment arrived with the questions. Basics, misplaced, almost uncomfortable. How is it possible that no one thought to put scientifically trained people in charge of interviewing a Nobel physicist? In a ceremony meant to honour science, ignorance took the microphone.

-What is matter made of? Atoms, science says.

-Does gravity exist? Yes, science says so.

-What is the formula for water? H2O, science says

But science does not say anything for itself, because it is not an inscrutable deterministic power that comes from something higher. And that’s the key, because it is precisely why science is not indisputable, not fixed, not absolute, and certainly not entirely objective.

Science was not revealed to humans; it emerges from humankind.

⚛️Atomic Model

Let me start with a confession; although it is one of my favourite theories in both science and its history, it leaves me with a bit of a scientific existential crisis:

1. It began in ancient Greece with Leucippus and his student Democritus, who proposed that all matter is made of indivisible particles called atoms that move in a void. But it did not end there.

2. In 1803, John Dalton revisited the idea, arguing that matter is made of solid, spherical atoms that are identical for each element. Still, it did not end there.

3. In 1904, J. J. Thomson discovered the electron and proposed the plum pudding model, where electrons are embedded in a sphere of positive charge. Yet it did not end there.

4. In 1911, Ernest Rutherford showed that the atom has a dense, positively charged nucleus at its centre, with electrons orbiting around it, which changed our understanding of atomic structure. And it did not end there.

5. In 1913, Niels Bohr introduced quantised energy levels for electrons, suggesting that they orbit in fixed paths around the nucleus. And again, it did not end there.

6. In 1926, the quantum mechanical model was developed from the wave equation, describing electrons as probability distributions around the nucleus. Those ideas kept evolving and now form the basis of the current model. Does it end here? No. We will keep redefining reality as more advanced technology becomes available.

And of course, thinking about what I’ve learned, I realise something: reality isn’t a fixed point. It isn’t that the models of Dalton, Thomson, Rutherford, or Bohr were simply “wrong”; each served its purpose in its historical context and offered a useful, predictive picture of reality. The same is true of the quantum mechanical model: it is complex, more complete and accurate than its predecessors, and still evolving.

Just as our knowledge advances, so too do our models.

This is why I do not like to speak of science as if it provided absolute truths. In practice, we try to understand and predict reality through definitions and models, knowing that these will change over time, because change is the intrinsic property of science.

⚗️Scientific Revolution, Sir Isaac Newton

The scientific revolution is a progressive rejection of entrenched dogmas that gradually separated other systems from empirically testable knowledge. Alchemy, astrology, physiognomy, numerology, humoralism… drifted away from what we now call scientific knowledge. Change defined the sixteenth and seventeenth centuries.

It is well known that Isaac Newton, one of the most influential scientists in history, referred to himself as an alchemist. He produced a substantial corpus of over a million words on alchemy. A compilation that far exceeds the combined volume of his work in mathematics, optics and physics.

With these statements, I don’t want to dismiss Newton; I admire him deeply. What I want to highlight is that. Even though he dedicates most of his life exploring ideas that lack a modern rational foundation, None could dare that his discoveries are unmatched, being considered by many (including myself) as the best science ever born.

“And now we might add something concerning a certain most subtle Spirit which pervades and lies hid in all gross bodies; by the force and action of which Spirit the particles of bodies mutually attract one another at near distances… and all sensation is excited, and the members of animal bodies move at the command of the will.” — Principia

🧠 Biases

There is nothing more human than an opinion, but science is the discipline of shaping opinions through methods. Bias can slip in at every step: the questions we ask, the measures we utilise, the results we publish, and the findings we silently dismiss.

A quick example: A famous paper on pluripotent cells was cited 4,482 times. Later, a detailed audit found two figures with identical regions shown in different contexts. In plain terms, the images had been altered, so those panels contained falsified data. By then, the paper had already been echoed through thousands of articles as background or support, showing how errors or misconduct can survive peer review and propagate across a field.

Another example is the sugar industry’s influence in the 1960s. The Sugar Research Foundation funded Harvard researchers to write a high-profile review that downplayed links between sugar and heart disease while shifting blame to saturated fat. The payments weren’t disclosed (journals didn’t require it at the time), and the review shaped decades of public debate and policy. Decades later, internal documents surfaced showing the funder’s role, and re-analyses have painted a more mixed picture of sugar’s risks. It’s a textbook case of how well-funded interests can seed the literature and public messaging to tilt opinion.

🧭 A Living Method

Science is not a catalogue of final answers. It is a way of asking better questions, building models that predict, and replacing them when a better one comes along. Because it is human work, it grows with our tools, our data, and our imagination.

So let’s keep our grip light. Hold theories firmly enough to use them, lightly enough to improve them. Be curious, test ideas, welcome surprises, and resist turning methods into dogmas :)

We all carry that quiet voice inside telling us we don’t belong. Sitting in a classroom, staring at the board, and thinking maybe I’m the only one who doesn’t get it. Walking into a new place and feeling like everyone else is already two steps ahead. These are feelings that every scientist learns to deal with.

But here’s the secret: nobody has all the answers. Not even the people we admire the most. What sets them apart is not certainty; it’s curiosity.

And yet, some of the brightest minds in history felt the same. Richard Feynman, Nobel Prize winner and one of the most brilliant physicists of the 20th century, never pretended to know everything. In his Fun to Imagine interviews, he spoke with joy about not having all the answers. For him, ignorance wasn’t shameful; it was the starting point of wonder.

“I can live with doubt and uncertainty and not knowing. I think it’s much more interesting to live not knowing than to have answers which might be wrong.” — Richard Feynman

✨Fun to imagine

—> Full interview

I remember the first time I pressed play on Richard Feynman’s Fun to Imagine. It didn’t feel like watching a lecture. Instead, it was like joining a conversation with someone who carried the universe in his pocket. No chalkboards, no equations. Just Feynman, leaning forward in his chair, eyes sparkling as he unravelled the hidden forces shaping our world.

He jumped from magnets to fire, from rubber bands to water patterns. Every day, things suddenly stretched into infinity. A simple cup of tea became a story of atoms in motion, a flower into a tale of evolution and sunlight, a glass of wine into the history of the cosmos condensed into liquid.

What stayed with me wasn’t just the knowledge but the feeling. He made science feel alive, not as something locked away in books, but as a way to see the world differently. Watching him, I realised curiosity isn’t just about finding answers; it’s about learning to live in a universe where even the smallest detail can reveal a miracle.

He spoke with the sparkle of someone who saw the world not as a series of facts, but as an endless collection of little miracles.

🔮Miracle People

—> Interview

The highlight of “Fun to Imagine” is when Feynman is asked a common question: Are scientists born different, with a special gift? His answer was as simple as powerful.

For Feynman, scientists were not miracle workers or geniuses born apart from the rest. They were ordinary men and women who chose to dedicate themselves to studying, imagining, and asking questions that others left unanswered. Or in other words, what made them different was not their nature, but their persistence.

And when he admitted that he, too, was just an ordinary person who studied hard, he was encouraging everyone to see themselves in him. It was his way of saying: “If I could do it, so can you”. That’s what makes this moment so powerful. Feynman’s brilliance doesn’t feel distant or unreachable. Instead, it becomes a mirror where anyone can recognise their own potential.

Maybe that’s the real legacy of Richard Feynman. Not just the diagrams that carry his name, but the way he invited us never to stop enjoying the mystery. To treat knowledge not as a destination but as an endless playground.

“I don’t have to know an answer. I don’t feel frightened by not knowing things, by being lost in a mysterious universe without having any purpose. It doesn’t frighten me.” — Richard Feynman