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Tesla vs. Gasoline: Analyzing Fuel Costs in 2025 | February 26 2026, 04:07

We bought a Tesla in mid-2025 – comparing gasoline costs to electricity costs.

Looking just at charging the Tesla, the stats are separate. Since buying, we’ve used 5000 kWh costing $738 – covering 13,550 miles. Meaning, traveling 18 miles (28 km) costs one dollar. On a Toyota RAV4, one dollar spent at the gas station gets me 10 miles (16 km).

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.

Exploring the Tango Vibes: Astor Piazzolla and Beyond | February 23 2026, 06:31

A few days ago, I decided to Google whether Astor Piazzolla’s music would be performed anywhere nearby, and saw that this very weekend, close by in Strathmore, there is a Tango After Dark show featuring Piazzolla’s music, accompanied by an Argentine orchestra and Argentine tango dancers. Really cool, but I didn’t bring any recordings here.

While Googling what this exotic instrument the local soloist was playing – the bandoneon – I stumbled upon a very very very cool concert of Mario Pietrodarchi accompanied by the Minsk Orchestra. This concert occupies the top five spots in the most popular recordings of the Belarusian State Chamber Orchestra – just go to popular and listen to everything, all of it’s great. You’ve probably already heard Libertango and Oblivion without me, they are ubiquitous, so I’m attaching Angel’s Dance (Milonga del angel) in the comments.

The Sole Excommunication of the 21st Century: The Case of Monk Nikolai Romanov | February 21 2026, 00:10

I wanted to find out who was excommunicated in the 21st century, and it turned out that there was only one person. That was Nikolai Romanov (schema-monk Sergius). He was the founder, builder, and spiritual father of the Sredneuralsk Women’s Monastery.

Do you know why? He asked the nuns and parishioners, “are you ready to die for Russia?” The investigation saw this as incitement to suicide. He also called the COVID-19 pandemic “non-existent,” cursed those who closed churches for quarantine, opposed vaccination and the “digital camp,” and called for civil disobedience to church and secular authorities.

In November 2021, he was sentenced to 3.5 years in a colony. Later, in 2023, his sentence was increased to 7 years on a second charge (of inciting hatred). In April 2021, court bailiffs completely evicted all residents of the monastery (nuns and laypeople) due to violations of fire safety requirements and urban planning regulations.

The Russian Orthodox Church could not say “he was not with us by that time,” so they simply excommunicated him.

Navigating the Tricky Path of Online Donations: A User Experience Dilemma | February 20 2026, 19:02

Here we have the ultimate tricksters. If you accidentally choose an answer for “would you like to donate?”, getting to “oh, I don’t want to yet” takes about 10 minutes and is fraught with the risk of losing your seats. Because 1) there is no option for ‘don’t want to’ 2) any selection ranges from $5 to $9.60 3) refreshing the page results in an error, forcing you to reselect seats and try not to hit those radio buttons again. And by the way, these were the last two seats in the auditorium. They weren’t available yesterday, but showed up today.

Revolutionizing Research: Introducing a Web-Based Notebook Integrated with AI and PDF Support | February 19 2026, 16:19

I’ve further developed a new tool for myself for working with information and organizing it. The main idea is a web-based notebook for research, studying subjects, working on them, integrated with AI and PDF support.

The main problem with typical PDF readers and notes is that the context is lost as soon as you switch to a new tab. In my tool, each text fragment or PDF becomes a node in a “live” hypertext tree, which I can access from multiple computers at any time.

Work process:

– Contextual AI. I can ask the AI to clarify complex passages right within the document. The explanation stays right where the question was asked. Moreover, it is a separate document, linked to the specific spot in the source. When clicked, you see both the original and the explanation on the screen at the same time.

– Panels instead of windows. If the explanation itself requires clarification, a new panel opens to the right. This allows for an endless chain of queries, never losing the place in the original text. That is, you see several panels at once, and unnecessary ones can be closed.

– PDF support. I can upload a PDF, select an area on the page (e.g., a complex diagram or a list of authors), and the LLM instantly extracts data, supplements, or explains them. The explanation is attached to the spot where it was requested, just like with non-PDFs.

– Nested annotations. My comments are not just static text. They can contain their own PDFs, links, and further sub-tasks for AI, maintaining a depth of nesting that reflects how we actually think.

This is not just a file storage system, but an “engine” for building knowledge.

The tool suits me personally very well, but perhaps it only solves my specific tasks. What do you think, would something like this be useful to others? Would it be useful to you? Should I develop the project into a fully-fledged product and give it to other users for testing?

Harnessing Productivity: Personal Techniques That May Just Work for You | February 17 2026, 22:21

I formulated for myself how I manage to get a lot done (actually, I don’t). It’s not a fact that it will work for others. But still, here are the points:

1. Do what you like. You need to do what your heart is in at the moment. If you force yourself, efficiency drops tenfold.

2. Sports anger as a catalyst. You need to treat failure not as a tragedy, but as a personal insult from the task. Anger is the quickest way to enter a state of hyper-focus, turning “didn’t work out” into “oh really, now watch me”.

3. Seamless switching. As soon as energy in one task has waned or the task is done — leap to the next funnel that beckons right now. It might not always be work-related. For instance, I might play the piano, draw, program, write a book, or do work.

4. Completing. Take a chunk that you can chew and bring it to a plus-minus norm. Don’t drop it midway, while there’s still momentum. Finish and refine – that’s a task for the next “high”.

5. If you can’t break through a wall — don’t smash your head against it. Mark the point of stopping, say “I’ll remember you” and retreat to return with a different tool or a different mood. The main thing is to keep this “open gestalt” in active memory and not tuck it away for too long.

6. An external promise is sacred. If you promised a deadline by Monday, personal comfort (like sleep on Saturday) is sacrificed. This pain teaches you to filter promises in the future. Your word must have physical weight.

7. The plus one principle. Always do a bit more than expected of you. How much more is a question of context, resources, desire, but the delta should be tangible.

8. The principle of useful output. Any product of activity should be in a form that can be delivered. The English word for this is ‘deliverable’. Simply getting to grips with something is not a product. But understanding it and documenting it in Confluence is a product. A letter, an article, code – anything.

9. “You gotta, Fedya, you gotta.” Perform mandatory ceremonies and necessary bureaucracy as an inevitable evil that simply has to be done anyway. Need to pass some stupid training every six months? Allocate an hour for it and suffer through.

10. Have the best tools for the task. If you don’t have them, strive to possess them and learn to use them.

Three more principles, which seem unteachable but are very helpful:

0. Don’t get irritated and don’t irritate others.

1. The ability to instantly separate the important from the junk, and the urgent from the hustle. This is an intuition that only develops with years “in the field”. And total curiosity – the ability to find excitement in any topic. This applies to everything – including who to talk to and when to go to the store.

2. If you’re bored — it means you just haven’t dug deep enough. Interest is a matter of immersion scale and having the right people, books, YouTube videos, etc. Eventually, there simply are no topics that seem boring.

3. Lifetime learning principle. Any project is a legal excuse to become smarter at someone else’s expense. Look for what ignites you in routine and what you’ve long wanted to learn. See a task that would be more elegantly solved with a script in Haskell, a language you’ve never seen before? Then today, we are learning Haskell. True, enthusiasm should not bury the deadline. You need to deliver results, even if the experiment completely fails. Promise foundation first, then decorate with the new skill.

These principles have a downside. For instance, I progress very slowly in playing the piano because good progress requires two other principles that don’t “get along” with my principles above:

1. The “one more lap” principle. If you sat down, and got tired after an hour, you need to spend two more, and then you can get up.

2. The “clenched teeth – go” principle. If you’ve taken on learning something, do it regularly, preferably at the same time, and if necessary, through “I don’t want to”.

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)