Seeking Alpha Testers for a Revolutionary Text and PDF Management Tool | March 03 2026, 03:02

Looking for alpha-testers. As part of R&D and for my own tasks, I wrote a productivity tool (I actually wrote about this in my last post, but Facebook said that because I put a link in the post, only 12% saw it). Now I want to check if it will be useful to anyone else. If the idea resonates with you — let me know, and I will share access.

Website smartfolio dot me. What’s the main idea?

It’s an online notebook for working with text and PDFs, organized as a graph. It looks like Google Docs, but there’s an important difference: you can attach “child” documents to specific parts of the main text to expand on details or clarify concepts. These “comments” themselves are full documents and can have their own nested branches.

If there’s a fragment in the text that is unclear, you can ask the system to explain it (this will require your Google Gemini API key).

The system uses the full context of the document to generate a response.

Explanations are permanently attached to a specific place in the text.

This is super convenient when reading complex scientific articles. For instance, you can highlight the authors’ surnames in a PDF and instantly get a background on them — the information will be attached right to that fragment on the page.

Typical workflow

Upload a complex text and read it right in the app from either a mobile or a computer. As you go, add manual or AI-generated notes to important or unclear sections for future reference.

I do not store your documents, PDFs, images, or API keys on my servers. All data is stored in Turso DB (SaaS, free up to 5 GB).

Screenshots on the website’s main page best describe the project.

How to try?

To register in the app, you need an invite code. Just write me in the comments or in a private message, and I will send it.

Website smartfolio-dot-me

The Lost Version of Repin’s “Unexpected”: A Revolutionary Woman’s Tale | March 01 2026, 23:59

It turns out that in the first version of the painting “Unexpected” the main character was a woman, a Narodovoltsy revolutionary! This was a smaller version, later Repin painted a larger one with a man – the one everyone knows.

And the first version is kept in the Tretyakov Gallery but it is not displayed.

Well, as everyone knows. In general, Russian and Ukrainian artists are hardly known outside their countries. There seems to be one painting by Repin in the Metropolitan Museum of NY and a few in the Orsay, but that’s almost nothing, and I wouldn’t be surprised if they are all in storage.

Here people know Rublev, the Russian avant-garde (Malevich, Kandinsky, Chagall), but nobody (except professionals) knows Shishkin, Levitan, Vasnetsov, Surikov, Savrasov. Despite the fact that many of them studied in Europe and worked from there. Remember Ivanov and his “The Appearance of Christ Before the People”.

Now I’m googling why. They write that the French considered Russian art of that era something akin to journalism in oil. Like, using the canvas as a platform to preach morals, tell stories, expose social injustices. Social drama, suffering peasants, harsh winter landscapes, and execution scenes – all this seemed frightening to Americans. Kind of like Dostoevsky in oil. How can you hang that above a fireplace?

Exploring the Mystical Connection Between π² and g in Defining a Meter | March 01 2026, 17:11

It turns out that π² ≈ g is not some mystical coincidence. When the first scientists contemplated the definition of the meter, there was one elegant proposal: to make the meter equal to the length of a pendulum that takes exactly one second to swing from one side to the other.

For a mathematical pendulum, the period of oscillation is calculated by the formula: T = 2π √(L / g). If we take the length L = 1 meter and set the full period T = 2 seconds (so that it takes exactly one second for each half swing), the equation implies: g = π² (m/s²).

The definition of the meter was later changed: it was tied to one ten-millionth of the distance from the equator to the North Pole along the meridian passing through Paris. However, this geodetic definition was inspired by the earlier idea with the pendulum. Notably, both approaches match up with an accuracy of 1%. Essentially, since the old “pendulum” definition was the main candidate for a long time, values were adjusted so that the new meter was convenient and close to the measurements customary at that time.

It is also interesting that the number of seconds in a year roughly corresponds to the number of pi * 10^7. Earth’s orbital speed is about v = 30 km/s. The distance from the Sun to Earth is approximately r = 150,000,000 km. Thus, over a year, Earth travels a path of about d = 2 * π * r. Then, the orbital period equals T = d/v = π * 2 * r/v = π * 10⁷ seconds.

The Lasting Legacy of Heaven’s Gate: A Cult’s Continuing Online Presence | February 28 2026, 04:09

Remember the American cult that had 39 members simultaneously self-extinguish in a mansion near San Diego, believing that they would be picked up by aliens? Well, their website is still up and running. The earliest version of this site from 1999 is virtually indistinguishable from what’s on the site now. The only difference is the ® symbol, which was after the name of the cult in 1999, but not now.

I Googled what’s up with their trademark registration. Just recently, in 2020, the company “The Evolutionary Level Above Human Foundation” registered (or renewed) rights to this trademark. The category is indeed listed as Lace, Ribbons, Embroidery, Fancy Goods, but the name of the company leaves no doubt that they are thinking about aliens.

I Googled some more. Turns out, this foundation, The Evolutionary Level Above Human (TELAH), acts as the “guardian of the legacy of the group ‘Heaven’s Gate'”, and has sued Stephen Havel and other defendants for copyright and trademark infringements, accusing them of illegally distributing archival materials and selling themed merchandise. The last update shows the parties are obligated to hold a meeting by the end of March 2024 to try to negotiate confidentiality and authentication of evidence without further judicial intervention.

Specifically, the foundation consists of real people from Arizona, Mark and Sara King, and the organization is registered as a corporation. They respond to emails and send out books and cassettes if you transfer them money.

Other former members are trying to challenge their “right” to use cult materials, such as recordings on tapes in court.

In short, some kind of life goes on there.

That is, the next time you think of Flat Earthers as “some pranksters pretending to be weirdos”, remember these folks, maintaining their website and selling books by their “prophets”.

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.