I always thought the brain was just that—me, a bunch of wires and switches, a circuit set once and for all. Even when you forget your second-grade teacher’s name or can’t learn to park backwards, somewhere inside there’s this feeling: that’s the limit. Biology said “stop” — so it won’t grow anymore.

But it wasn’t just a gut feeling or laziness. It was official knowledge, written in textbooks, said from a podium by a man named Santiago Ramón y Cajal. Not just anyone — the very Cajal whose portrait hangs in institutes like a science icon. He once said with certainty: nerve paths are fixed and unchanging. Everything can die, nothing can regrow. Period. The door slammed shut.

I think about what it must have been like — to build your life under that sentence. Every failure or skill you couldn’t reach turned into fate: that’s how it is, nothing you can do. You could only accept it or pretend to be a tough ironist.

Then it turned out: the door wasn’t a door, but a thin curtain. You just had to pull it aside a bit — and behind it was another reality. New neurons are born in the hippocampus of adults. The brain grows and shrinks right now — without Cajal’s permission.

At first it seemed: well, maybe some cells were born somewhere. Maybe it’s just a statistical fluke? But it turned out way stranger and more physical.

London cab drivers spend years mapping the city’s maze — and their rear hippocampus gets thicker, literally thicker to the touch (if you could touch it). Not a metaphor: brain matter changes in response to a daily life task. Or another example: someone had a stroke, part of their brain died forever — and suddenly a nearby area slowly starts taking over lost functions after months of stubborn training.

Nothing mystical: hundreds of thousands of new connections form where yesterday there was a blank page.

There are less dramatic cases — meditation changes the thickness of the cortex; learning a new language at 60 leads to growth of gray matter right where it’s needed for speech and memory. The adult brain acts more like warmed-up clay: you touch it a little — the mark stays.

At that moment your sense of self suddenly flips inside out. If neuroplasticity works all life long — there’s no biological sentence at all.

The usual excuse “I’m just like this” disappears. Turns out, I’m not some fixed thing with set borders; I’m a process of constantly rearranging bricks while building my own house. Any fear or habit today is the result of the path of changes that led here — sometimes by chance, sometimes because “there was no other way.”

Freedom feels almost physical: if there’s no ceiling on what’s possible — there’s no automatic fate for what comes next.

But then another feeling comes: responsibility becomes full and irreversible. If I can always change — any current “me” is the result of my own actions (or inaction) plus the world around me.

That sounds almost heroic… until the thought stumbles on the dark side of plasticity.

The brain doesn’t change only for the better. Chronic stress shrinks the hippocampus; addiction builds reward loops you can’t break with willpower alone; trauma rewires fear centers so deep that even years later the body reacts faster than the mind.

Plasticity turns out to be a two-way street: any crack can become a highway for new chances or a dead end of locked-in pain. The freedom paradox: the chance to be anyone comes with the risk of becoming someone you never wanted to be… just because you got caught in the grip of your surroundings or your past.

The more you think about it, the wider the fallout beyond your own story.

If the brain is constantly shaped by its surroundings, therapy becomes a way to jump into that flow of plasticity. But can you really steer your own inner current?

Adult education stops being a fight against nature. Instead, it raises a bigger question: what are we even teaching those who are changing every single minute?

And social policy sounds even scarier: poverty literally rewires the brain’s structure; a harsh environment writes invisible commands right into the cortex.

Here comes a chilling clarity: if I am a path of nonstop change, then who’s the author of that path? Me? My parents? The city around me? The work chat in the morning?

Maybe there’s no such thing as a “real self” at all. Maybe there’s just the current version of a program, running between endless updates?

Every cell that was once part of me died and vanished long ago. New makeup — but the same name, the same habits, some even say: “that’s you.”

So why does the memory of childhood feel like mine, if that kid was literally a different person?

I was walking through the park, watching people — faces, steps, phone calls. Someone’s laughing, someone’s checking their watch with a frown. Then a thought flashes: what if the mind isn’t inside at all? Not inside each passerby’s head, but somewhere in between.

Like the ability to think and understand isn’t a trait of the “individual,” but an invisible web gluing everyone together. Everyone seems on their own, but somehow there’s something shared. Only it’s clearly not where you usually look.

At first, it sounds silly — each brain is its own, billions of neurons under the skull. But then images pop up from a totally different place. Ants: alone, almost helpless creatures, no memory, no planning. But together, the colony solves problems no single ant could.

Pheromones instead of words — one finds food and leaves a trail; others follow the same path; the route shortens without any calculations; long roads vanish by themselves. And suddenly the shortest path is found — as if it’s not the ant, but the whole anthill thinking.

It’s wild to see: there’s no spot where this intelligence lives. No ant knows the whole picture; the process goes on even if you swap the players. The colony’s mind shows up not inside the ants, but *between* them — in the pattern of their interactions.

A similar trick happens with starling flocks. Those shimmering clouds at sunset: thousands of birds change direction almost at once without a leader or a plan. Each bird just watches its neighbors: stay close, don’t crash, move roughly the same way.

You get synchronicity and a group reaction faster than any single bird’s response.

In the human world, this oddness shows up too: markets or Wikipedia. No one runs the whole show from start to finish; everyone acts on their own drives; the result sometimes beats any expert — like the system “knows” more than the sum of its parts.

The line between “I” and “between” starts to blur. Where’s the real border? If the mind arises in the links between system members — what counts as the thinker? The individual becomes just a node in the web; the web itself suddenly gains mind-like traits, no matter its pieces.

It’s a weird shift: it’s not the single piece (“ant,” “bird,” “trader”) that matters, but the flow of info between them. Mind sparks where connections get dense enough to birth something new.

But what happens to the feeling of self? If you zoom out more — maybe all humanity works like one huge brain? Does civilization think thoughts no single person can grasp? The network (the internet as a living field) gains traits its parts don’t have: ideas spread faster than one brain can understand; movements arise without authors.

Makes you wonder about consciousness — collective mind can exist without the participants’ subjectivity (like the anthill), be smart without a sense of self (“I-the-collective”). So intelligence might be possible without inner life?

If mind is spread out in the pattern of links — the borders of “person” become fuzzy to the point of vanishing. Who’s talking when I think? Where do thoughts come from: are they mine, or does the web just pass them through me like electricity through a copper wire?

I come back to this light confusion: where does the thinker end and the thought begin? Can thinking exist outside individual experience? Or does true mind always happen outside the individual — like a flash at the crossing of paths?

And there’s only this strange feeling underfoot:
can we ever know
if something bigger than us is thinking right now?

There’s no word for “tomorrow” in the language — no “tomorrow” in the head. Just this slippery “now,” like time itself got stuck in one spot.

If you try to imagine something that has no word at all — can you even think about it? Or does the thought just vanish before it’s born?

When you first run into the idea of quantum biology, something inside shifts. Not just a “new hypothesis,” but a feeling like the usual line between living and nonliving suddenly gets see-through, slipping away.

In the lab — cold formulas, dead machines. But inside a cell — warm chaos, the wet chemistry of life. Yet nature doesn’t follow our neat borders.

A photon flies through a vacuum — quantum stuff seems right at home there. But once it’s inside a green leaf, you somehow expect it to obey school physics. Turns out — the photon’s energy in the plant doesn’t bounce blindly between molecules and get lost in the mess (where efficiency should be around thirty percent). Instead, it’s like it exists in all possible paths at once and picks the shortest one with almost no loss.

It’s weird: plants have long built their own perfect quantum computer. Runs at room temperature, in water, amid thermal noise. Compared to labs with their liquid helium, it almost feels like a joke. But there’s no mysticism here — just coherence right in the biochemical soup.

Later we talked about bird migration. Huge flights across continents once seemed like a pure biology win to me. But it turns out — a pair of electrons inside a robin’s eye might decide it all. They’re so tightly entangled their spins feel Earth’s magnetic field right inside the cell and give the bird “magnetic vision.” The quantum effect suddenly pokes through the whole body to shape the behavior of the entire creature.

Inside the cell, enzymes break expectations too. Textbooks say a particle must jump an energy barrier, or reactions would be too slow for life. But protons just tunnel through the wall — going where they shouldn’t be by classic energy rules. It’s like life reads between the lines of physics and uses loopholes theorists are only starting to describe.

Splitting physics and biology works only if you look from far away. Get closer — the line melts. Evolution billions of years ago already used superposition effects right where modern physicists argue: can this even happen outside ultra-low temperatures?

At some point, you catch yourself thinking: maybe the “living” isn’t about some secret ingredient or soul, but a special way matter is put together? The cell stops being a bag of chemicals — it turns into a pattern of linked paradoxes as big as the Universe.

After that, the chain gets shaky. Where does matter end and life begin? Where does body stop and mind start? If thinking is quantum too (even if Penrose’s ideas are up for debate) — then what really causes choice or experience? Could consciousness be a superposition of possibilities until it notices itself?

Every new example erases another line: between observer and observed; between organism and environment; between thought and the movement of protons inside brain proteins.

I feel a strange philosophical cliff under my feet: if it’s all built like this… is there even one honest line left between life and nonlife?

Or maybe that whole border lives only in our heads?

Strange thing, I’ve never seen my own face straight on.
Only reflections — always from the flip side.

Makes you wonder, is it even possible to know yourself without a mirror?

Yesterday, that talk came up again. Dark energy — that’s what won’t let me go. Funny how it all started as a joke: 70% of the Universe is just a placeholder in the code. Then suddenly, it stopped being funny.

When you first hear about dark energy, it sounds almost mystical: an invisible force stretching space itself. But if you look closer, it gets uneasy. We don’t see it, can’t catch it with instruments, don’t even feel it indirectly — it’s just that something doesn’t add up between how the Universe expands and how the formulas should work. There’s a hole in the equations, and to make them fit observations, they stick in a new word: “dark energy.” Almost magic — but better to call it a crutch.

For some reason, it starts to feel like a bug fix in someone else’s project. When old code stops matching reality, instead of rewriting the base, they add another variable. It’s naive to think only hacky programmers do this. Science history is full of stuff like this — ether was exactly the same kind of lifesaver for light. Until suddenly it turned out: there’s no ether; the whole thing rested on a ghost.

Now something similar is happening with dark energy. It was born from the very structure of our tools — from how we measure light from distant supernovae, from assumptions about gravity’s rules working the same on all scales at once.

And here’s where it spins your head: why did we decide to stretch Einstein’s formulas across billions of light years? The equations worked for planets and stars nearby; beyond that safe zone, we plug in numbers and look at the result like it’s a Galileo’s mirror — but we’ve never actually seen the reflection itself.

Webb poured fuel on the fire: those galaxies that, by our model, should have been tiny and messy — turn out complex and big already in the first few hundred million years after the Big Bang.

Alternative ideas pop up: maybe it’s not some mystical anti-gravity? Maybe our physics just breaks down where no one ever checked directly?

The thought flips for the first time: maybe the whole idea of “dark energy” is just a patch for the theory, not a description of what’s really out there. The whole familiar picture of the world depends on a couple of numbers in equations; one step right — you have to invent a new entity; one step left — the meaning of matter itself shifts.

If 70% of the whole Universe is just patch-parameters inside formulas… That’s starting to feel like a dream inside a dream. A place of error or perception artifact turns into a whole chapter in cosmology encyclopedias. The measuring tool created something no one could even imagine before.

It reminds me of the endless loop about language and thought: does thought exist outside words? It’s the same here: does dark energy exist outside our way of counting? If you take the patch out of the formula — will anything remain behind that hole? Or will there be just emptiness labeled “unexplained”?

Sometimes it’s scary to think: how many more places in our knowledge are just bug fixes? Where’s the line between the real setup of the world and the traps of our equations?

I stand before this question like it’s an abyss.
I don’t know the answer.
Just a strange wobble under my feet:
maybe this whole universe —
is an echo of a tool’s mistake,
and we patch ourselves
and call it knowing reality?

Every night I disappear. Like someone erases me and writes me back in the same spot.

What if this “me” is just another version, remembering someone else’s yesterday?

Yesterday, I was standing at a market in Milan, picking apples. Bright green ones with a tang, or shiny yellow? I was almost decided — then something weird hit me: “I’m choosing.” Like a voice inside said — take this kind. Fine, but why this one? Why want something more than everything else? That feeling of choice felt like mine… until it started feeling oddly foreign.

Then a familiar fact popped up: there’s a whole civilization living inside me. More bacteria in my gut than my own cells. They have their own interests. They make almost all my serotonin, toss in dopamine, mix up GABA — the stuff I usually think of as mood, desire, anxiety. But it’s not my head cooking this up — it’s a lab somewhere deep in my belly.

It’s crazy how this isn’t just a metaphor, but a political drama with lobbyists. The bacteria deal directly with the brain: sending chemical messages through the vagus nerve (like smuggling on an inside market). Some love sugar and send out stuff that makes me crave chocolate; others prefer fiber and push me toward broccoli. I think “I want sweets” — but maybe that’s not my own wish, but a group text from sugar-loving microbes.

There’s another weird thing: if you transplant the microbiome from one body to another (they do this with mice), behavior traits come along with the bacteria. A calm mouse turns anxious after getting a depressed microbiome. Mood turns out to be contagious: catch a stranger’s bacteria — you change.

That means character isn’t just neurons and experience, but a symbiosis with trillions of tiny creatures inside me. So where does “I” end and this crowd begin? How far can I change my microbiome with diet or meds and still be me? Or after another round of probiotics, will I wake up someone else — and not even notice?

Personality looks like the result of a vote among different ecosystems inside the body. It’s not just me running the show top-down; it’s trillions shaping “me” bottom-up, fighting for resources, bargaining over moods and wants.

After that, feeling in control seems pretty shaky.

If I change these quiet tenants enough… will I still be myself?

I’m thinking about this between apple stands.

Who’s really picking the flavor now? Me or us?

And when was the last time a choice was truly mine?