Tag: Engineering

Exploring TestMySearch.com’s Virtual Shopper System | August 15 2025, 04:27

As part of the TestMySearch.com project, I am creating a “virtual shopper” system that simulates the behavior of a real user in an online store: it starts with an abstract goal (for example, “something bright and sexy for the gym”), turns it into a specific search query, performs the search on the site, and depending on the results, may either continue browsing or, with a certain probability, reformulate the query if the findings do not match the original goal; the system then evaluates the pages for their alignment with the initial idea, opens product cards, randomly changes parameters such as color or size, makes decisions about adding to the cart and placing an order, and may also leave the site, which allows generating many sessions similar to real ones overnight for testing search, filters, and recommendations even before live users arrive.

The system is fully automatic. That is, the browser in the video opens by itself, the search field appears by itself (i.e., independent of the site), the system itself concocts the text based on that very initial goal, then the facets and search results are displayed, which may also be in a form unpredictable to the system — but it still understands what is what, and makes decisions about whether to rephrase the query, select a facet or click on a search result. There is a certain probability that the virtual user will leave the site. If the query is reformulated, for example, this virtual user does not repeat queries that have already led to empty or irrelevant results, so within the session there is “memory”.

Aluminum: From Precious Metal to Everyday Marvel | August 03 2025, 01:09

The USA imports aluminum mainly from Canada because aluminum leaves Canada and arrives in the USA. And from Europe, it would be alumin𝒊um!

Also, sapphires and rubies are essentially rusty aluminum, where in the process the new material becomes much harder than the original. In interaction with oxygen, different varieties of the mineral corundum are formed, which chemically is crystalline aluminum oxide (formula Al₂O₃). And bulletproof glass is essentially transparent rusty aluminum, aluminum oxide, but with aluminum nitride.

Also, aluminum was the most valuable metal on Earth until the 20th century. When Napoleon III entertained guests, they ate with golden spoons, while he used an aluminum one. And the “cap” of our Washington Monument is made of aluminum for that very reason.

Seattle’s Monorail: A Vintage Transport Still in Motion | July 22 2025, 16:28

Seattle’s two-station monorail (a world record!), reportedly self-sustaining and extremely popular among tourists despite being arguably the city’s most pointless form of transportation, features the same Alweg trains that have been in operation since its inauguration 63 years ago for the World Fair.

Interestingly, even the one-station monorail has a driver. I recently saw a job posting for a Monorail Driver, paying $20/hour (with a minimum wage of $18.67). Roughly the same hourly rate can be earned by stocking shelves in any supermarket in the USA.

However, the only major accident on the Seattle monorail in 2005 was due to a driver’s error. According to authorities, the driver of a train heading into the city failed to yield to another train at a spot where the tracks are too close together for simultaneous passage.

The problem was that the tracks were installed without the gap necessary for the free passage of trains. Imagine that! At one spot, just so:) This was deliberately designed to allow loading ramps to extend beyond the carriages. For 40 years, careful attention ensured that trains never traveled simultaneously on this section. But then one day, a driver decided to leave early — and the rest is history. As always, Murphy’s Law applies.

Nearby in 1988, the construction of the Westlake Center mall uncovered an issue just days before its scheduled opening. Engineers found the west track was two inches (50 mm) closer to the platform and building than it should have been, making it impossible to use. The issue came to light when a retractable loading ramp at the terminal scratched the blue train during a trial run; the misalignment was caused by a pin in a hinge that did not fold properly. The ramp was repaired in November, but other technical issues and prolonged safety inspections delayed the new terminal’s opening by four months. To avoid redesign, trains were simply not allowed to run simultaneously. As of 2025, bi-directional movement is still NOT anticipated above the narrow gauge section at the southern (Westlake) station:-)

By the way, exactly a month ago, the monorail at VDNKh in Moscow, opened 21 years ago, was permanently closed. There, too, nobody understood its purpose, and moreover, it was brutally unprofitable.

In the photo, Nadia enjoys Seattle

Seattle Airport Chaos: IT Glitches and Alaska Airlines Grounded | July 21 2025, 07:07

Seattle Airport is at a standstill – some nonsense with IT systems, Alaska Airlines planes are not taking off (grounded).

UPDATE: remember the door that fell off Boeing mid-flight? It was Alaska Airlines and Boeing 737 Max, which I am currently sitting in.

Exploring the Intricacy of a 3200-Wire Copper Telephone Cable | July 12 2025, 15:11

Copper telephone trunk cable. Here are 3,200 (!) color-coded wires each 0.4 mm in diameter. Such cables are usually made up of twisted pairs (each pair consists of two wires), and 3,200 wires mean 1,600 pairs. The entire cable has a diameter of 9 cm and is produced in 250-meter segments. These segments need to be joined together, and then the ends connected to equipment. So, each of the 3,200 cores is carefully stripped and connected to the corresponding wire of the next segment. Probably a very entertaining activity.