Tag: Biology

Understanding the Surprising Subterranean Lives of Bees | June 09 2026, 01:12

I learned today that 70% of all bee species live underground. Another ~25% live in wood, and only ~5% live in hives, build combs, or live in colonies. Male bees are homeless; they’re only allowed home for sex. Outside, it’s cold, hungry, and dangerous. To protect themselves from predators, males of some species gather in “sleeping camps”. They hang onto grass blades with their jaws, stretch out their legs, and fall asleep in clusters of several dozens. They defend themselves from predators through the “dilution effect” – the more bees in a pile, the less likely you are to be eaten. The idea is simple: a predator can eat only a limited number of victims in one go. If you’re sitting on the stem alone and a predator comes – you’re eaten, the chance of dying is ~100%. But if there are fifty of you on the stem, the predator will still take one or two bees, but your chance of becoming the victim drops to a couple of percent. Red currant likely protects itself in a similar manner.

You might ask, who are the predators that eat bees? Mainly in those regions, it is the bug Apiomerus flaviventris. The bug pierces the sleeping male with its proboscis and sucks out the contents. Don’t ask where it pierces

The Intriguing Life and Science of Ilya Mechnikov | June 02 2026, 11:32

Talk about tons of weird and intriguing stuff about Ilya Mechnikov (biologist). His older brother (Ivan) – a prototype for Leo Tolstoy’s “The Death of Ivan Ilyich.” Another brother (Lev) – an anarchist, sociologist, fought in Italy alongside Garibaldi. Mechnikov himself made two attempts to depart this life: the 1st time — after the death of his 1st wife (who, suffering from tuberculosis, was carried into the church on a chair). Mechnikov swallowed morphine but survived. The 2nd time — when his 2nd wife contracted typhoid. He deliberately infected himself with relapsing fever. Both survived. By the way, this 2nd was his 15-year-old teacher (when he was 30).

Odessa. The country’s first bacteriological station on Leo Tolstoy street 🙂 An employee there botched a vaccine for anthrax and a whole flock of sheep died. Scandal => M emigrated to Paris.

Paris. Came under the wing of Louis Pasteur (the father of pasteurized milk). P supported M’s theory, gave him a lab in his institute for 28 years. M worked there for free.

M advanced the theory that not everyone who gets infected becomes sick and dies. Basically, it’s all about (of course) the gut microflora. To prove it, he deliberately drank cholera vibrios. Nothing, he got lucky (“lucky as you were”, M thought)

Not satisfied. To prove that it was about the microflora, he made his lab assistant Latapie drink cholera. Hmm, then M gave the culture to a second person, the biologist-watchman J.-B. Joupié. Joupié nearly died. Mechnikov: yay, it works: different microfloras, the microbe works differently (hmm).

Result – Nobel Prize for phagocytosis (cell immunity). And he is also the “father of gerontology”: M proposed that for longevity, one needs to quell “bad bacteria” using probiotics (hmm).

In the end, he still died after the third heart attack. In Paris, his ashes are kept in the library of the Pasteur Institute. Also, in English Wikipedia, he is Élie Metchnikoff. Hard to guess.

In the photo, Mechnikov is persuading Leo Tolstoy that he is not a charlatan.

Understanding the Tingling Sensation from a Charging Laptop | May 31 2026, 15:27

Today I learned why there’s a tingling sensation from the metallic body of, say, a MacBook when it’s charging. The effect is called electrovibration, and it arises due to parasitic capacitive coupling and the absence of grounding in the standard power supply. This seemed kind of obvious, but exactly how it works was not.

Inside the charger, there is a capacitor, which allows a safe but noticeable potential of AC current to seep into the aluminum laptop case. When you touch the cover, your body and the laptop become a sort of living capacitor, with a thin layer of aluminum and skin acting as an insulator that separates the charges.

The pulsation of current in the socket – 50-60 Hz. The electric field between the finger and the body sometimes strengthens, sometimes weakens. According to Coulomb’s Law, this causes the skin to be attracted to the metal and then released. If you simply rest your hand on the laptop, the force of this attraction is too small to notice.

It results in sensory deception – nerve endings in the finger pads, which in nature are responsible for recognizing textures, go haywire from such microscopic friction chaos. The brain is completely unable to directly recognize electrostatic microcurrents, so it chooses the most logical interpretation for itself and convinces you that it’s the metal itself that is vibrating.

The Radical Survival Strategy of Elysia marginata: Decapitation and Regrowth | May 24 2026, 21:10

Today I learned about the sea slug Elysia marginata, which (I quote) can lose its head like no other: when this slug is overwhelmed by parasites, it doesn’t go on marathons to Instagram gurus but takes a radical approach — it detaches its head and starts a new life. (I quote Anna Fe above and below because I learned everything from her post) The slug’s neck has a special groove labeled “cut here.” The head separates along this line, not immediately, but over several hours. Having shed its fatty, annoying body, the head, giggling, crawls away, saying “goodbye” to its former self – along with all the parasites, and also with the heart, kidneys, intestines, and reproductive organs. The slug survives understandably – “like everyone else, using its head (it eats with it).”

And here I started thinking: is the definition of a head—where you eat from? How do biologists understand where the head is in some fantastical creature? For example, does a sea cucumber have a head?

I Googled it. Wow, interesting. No, the head is not where you eat from. It is what first encounters the surrounding environment when moving forward. Since this end needs to quickly understand what’s ahead (danger or food), during evolution, two things concentrate there:

1) Main sensory organs (eyes, antennae, locators, chemical receptors)

2) CNS (brain or the largest nerve nodes – ganglia), to instantly process the information received from these organs.

Therefore, they write, when a biologist looks at an unknown fantastical thing,” he looks not for the mouth, but for the main control point. Where there is the highest concentration of nerve cells and receptors, there is the head.

But let’s return to the independent head of the slug. How does it manage without a stomach?

These slugs feed on algae and are able to retain their chloroplasts (structures for photosynthesis) in their tissues. Thus, the head temporarily turns into a plant and gets energy directly from sunlight, while it regrows its new body. The wound on the neck heals within 2 days, a new heart takes about a week to grow, and a fully new torso with all organs—just 20 days.

The former body, meanwhile, just lives its life on the ocean floor. Its heart beats and nerves feel, but poor thing, it cannot eat and eventually dies from exhaustion.

Exploring Word Clusters in Religious Texts from Gutenberg’s Library | May 02 2026, 03:28

It’s interesting that if you take 8000 books from the Gutenberg library and construct a graph for each based on word connections to see how “friendly” words are—if word A often appears with B, and B with C, then how often does A appear with C? There’s a metric for this—the average clustering coefficient. Then, simply sort the books by decreasing this coefficient, about 70 percent of the top will be religious books—bibles, the Book of Mormon, the Quran. Well, some of them are duplicates in a sense, because a Bible in different formats remains the Bible. But clearly, its different parts are grouped together, meaning, they definitely share commonality in these triangular words.

But what unites all the books in this top— is that they were written many years ago or, as in the case of The Night Land, written relatively recently in the same style as many years ago.

By the way, among these books shines An Introductorie for to Lerne to Read, To Pronounce, and to Speke French Trewly. This is a French language textbook, written in English during the Tudor times (around the 1530s). Soverayn lorde kyng Henry the Eight. It was written by Gilles Du Guez—a French teacher at the English court. This particular textbook was compiled for Princess Mary (the future Queen Mary I, known as “Bloody Mary”), the daughter of Henry VIII. Check out a page from the textbook. Very cool English 🙂 …ye must pronounce it letyng your lippes jointe close, so that there be but a lyttell hole in the middes.

So, I delved into this textbook. It mentions a fruit called “openarses.” As you understand, this is “open arses” in English. In Tudor England, they called a medlar an openarse. If you Google what a medlar looks like, you’ll have no questions why it’s called openarses 😉

In the anatomical section (MEMBRES LONGYNG TO MANNES BODY), the author mentions next to the eyes and ears “the nether beerde” (literally— “the lower beard”).

Near-Miss at Leningrad: The Unknown Predecessor to Chernobyl | April 26 2026, 17:32

On the anniversary of Chernobyl. Those interested in this topic may not know that a similar accident could have occurred ten years earlier on the main (very first RBMK-1000 unit) Leningrad Nuclear Power Plant.

There was a nearly identical situation: one turbine in operation, reactor shutdown by emergency protection, and subsequent power escalation.

Back then, the situation was saved by the Chief Reactor Operator Mikhail

Karrask, who, acting intuitively and relying on his experience with industrial reactors, introduced into the reactor in portions

12 manual control rods

BEFORE pressing the emergency shutdown button.

A couple of years ago, Karrask passed away. This story is almost unknown outside the industry. For proof, google his obituary on Rosatom.

The technical part. The main danger of the RBMK reactors at that time was in the design of the control rods. At the bottom, they were equipped with graphite “displacers”. When the emergency shutdown button was pressed, the rods began moving down, and in the first seconds, the graphite tips did not dampen the reactor, but on the contrary, displaced the water and increased the power in the lower part of the active zone. But precisely, the instructions in case of trouble suggested pressing the emergency shutdown button. If you followed the instructions, “Chernobyl” would have happened earlier.

After the incident at the Leningrad NPP, a commission was formed. Experts (including those from the Kurchatov Institute of Atomic Energy) pointed out the dangerous design flaws of the RBMK – the positive void coefficient of reactivity and incorrect design of the rods. Unfortunately, extensive changes to the design of all RBMK reactors were not made at that time. Only operational regulations recommendations were given, which, as history showed, were insufficient to prevent the tragedy in Chernobyl.

Crabs in Love: Monogamous Parasites of Sea Turtles | April 15 2026, 21:56

WOW, it turns out that under the shell near the anus of sea turtles, the parasitic crabs Planes minutus make themselves at home, and there’s only enough space for a cozy duo, so they form a monogamous pair and live happily ever after inside the turtle’s butt (had no idea what to do with this information, so I brought it here). In relation to the turtle, this is commensalism. It’s when it’s good for one (or in our case, two), and the third doesn’t give a damn. I see a scientific paper claiming that they sometimes mistake the turtle for ocean debris, where there’s room for more than one wife, and then, goodbye monogamy. But, at least, no butts involved.

Evolution of Understanding: Brain as a Predictive Model | March 18 2026, 13:29

An interesting philosophical thought came to my mind. What if evolution doesn’t exist in us (not in biological life), but in our system of understanding the laws of the world 🙂 That is, the system of understanding the laws of the world adapts itself so that everything more or less matches up. That is, the brain constructs an internal hallucination and constantly suppresses it in order to minimize the error of prediction. And there’s a big question — does our understanding system strive for truth (absolute correspondence to the world) or just for comfort (so that the picture in the head does not fall apart)?

With this approach, there’s a problem that if you don’t look into the future, then at each iteration, the understanding system adjusts its model so that the prediction works, but simultaneously creates problems for the next iteration, because it has to account for them already. As a result, this layered pie accumulates contradictions and constraints to such an extent that each subsequent theory becomes more and more complex and accreted with a multitude of unexplainable gaps. Dark matter, black hole radiation, gravitational waves, and so forth appear to somehow stretch the owl to fit the globe.

But yes, this is related to the question of whether mathematics was discovered or invented.

Decoding Leather Products: From Genuine to Synthetic | February 23 2026, 18:11

Today I learned how the hierarchy of leather products is actually structured. Everyone knows that faux leather is completely synthetic; it’s a layer of polymer on a fabric base. There is also cheap leather, often labeled as Genuine Leather, which technically remains an animal-derived product. It turns out to be the lower, looser layer of the hide, which on its own lacks strength or aesthetics, so it’s turned into a sort of sandwich, encased in a thick layer of plastic (polyurethane) with embossing. Essentially, cheap leather is split or compressed leather scraps (Bonded leather or bi-cast/tri-cast), glued together with plastic. It’s essentially akin to plywood or particle board.

How such leather is produced: 1) Leather scraps and waste are taken 2) they are shredded into small fibers 3) mixed with a binder – polyurethane or latex – resulting in a mass similar to pulp 4) this mixture is evenly distributed on a substrate, which typically serves as fabric or paper material 5) a roller or plate with a pattern mimicking natural leather is then pressed onto the surface of the mixture, creating a texture reminiscent of real leather. 6) After drying, a protective coating is applied to enhance the strength, wear resistance, and appearance of the material.

Expensive leather is called Aniline or Full Grain. Essentially, it is made from the top part of the hide (which is exposed to air on the animal). It is dyed with transparent dyes, and contains no plastic. Nubuck or suede is part of the hide which, excuse me, comes in contact with the flesh.

Many also judge the quality of leather by its smell, thinking that a distinctive aroma is the main sign of authenticity and high class. This is easily mistaken. The scent we associate with expensive leather is often the result of chemists’ work. Manufacturers of cheap bonded leather products use special fragrance sprays that mimic the smell of expensive tanning. Real high-quality leather, such as vegetable-tanned leather, smells more like wood, oak bark, or mimosa, because these substances are used in its processing.

Another professional secret concerns the edges of the product. If you see that the edge of a bag or belt is neatly filled with a thick layer of “rubber” or paint so that the structure of the layers is not visible, this is often not done for design’s sake. Such a technique helps to conceal that very plastic sandwich which makes up the material. Craftsmen working with truly high-quality Full Grain leather often leave the cuts open or just slightly polish them with wax, because they have nothing to hide — the fiber structure of such leather is equally dense throughout its thickness.

Understanding Fever: A Physiological Defense Mechanism | February 17 2026, 09:00

I’ve only slightly (hopefully) gotten sick here and realized during the process that many people around me take pills for a minor onset of fever, considering it normal.

I’m sharing my understanding of the process, which should be very close to scientific. When an infection penetrates the body, foreign bacteria or viruses enter the bloodstream, which the immune system attacks. During the attack, signaling molecules are produced, the purpose of which is to declare a general alert throughout the body. Specifically, cytokines are produced, which also inform the brain (hypothalamus) that action is needed. Pyrogens (fever-inducing agents) include cytokines and external pathogens. The hypothalamus activates a fever through the synthesis of prostaglandins. Why: at a temperature of 38.5°C, the immune system becomes more active, antibodies are produced in larger amounts, microbial reproduction slows down, and some viruses do not reproduce.

If you consume, for example, Ibuprofen, it blocks the enzyme (COX) that creates these prostaglandins. Meaning, the pyrogens are still in the blood, but the brain “can’t hear” them and doesn’t raise the temperature.

There are only two cases when you should reduce fever: if you truly feel awful, have a severe headache, vomiting, etc. Unnecessary stress does not help the body. And if the temperature exceeds 39°C. At that point, the harm from high temperature outweighs the benefits. Even then, there are so many “buts” that a doctor should make the decision. For example, if the heart is problematic, these are special cases.

Oh, here’s something else interesting. Why when the temperature is high you feel “cold” and want to cover up. In the hypothalamus itself, there’s something like a thermostat, normally set to 36.6°C. When pyrogens arrive, it raises the temperature through prostaglandins, but since it’s the brain, it immediately cranks up its own “normal temperature” in its thermostat to, say, 38.5°C. As a result, a body temperature of 37°C suddenly feels low, and it feels like “it’s cold around, need to cover up.” Covering up is passive thermal insulation, and generally, it helps to more quickly raise the temperature to the target level. Later, when the temperature reaches 38.5°C, the chills may disappear (unless the hypothalamus further raises its thermostat). And when the temperature plateaus, around 38.5°C, covering up is harmful.

When the temperature starts to drop back, the internal thermostat switches to 36.6°C, and to cool down faster, the body produces sweat. So, if you’re sweating, it’s a sign of recovery.

(Well, what else is there to do at four in the morning, when because of all this, I can’t sleep)