Category: Tech

The Ingenious Spy Device Gifted in Friendship: Unveiling The Thing | September 01 2025, 01:03

Today in the museum I saw The Thing in person – simply a brilliant espionage device. In 1945, a group of Soviet schoolchildren presented a large wooden Great Seal of the United States to the U.S. Ambassador in Moscow, Averell Harriman, as a “gesture of friendship”. The seal was beautifully hand-carved and hung in the ambassador’s office for a whole 7 years. And it leaked secrets!

No batteries involved! It was all very clever, especially for 1945.

Essentially, it was a passive radio relay or “parasitic resonator”. Inside the wooden seal was a small metal cylinder with a membrane and an antenna-rod.

Soviet operators directed a specific frequency radio wave (about 330 MHz) into the ambassador’s office.

Inside the device was a cavity resonator, tuned to the same frequency. It “responded” to the radio signal and began to retransmit it back.

On one side of the cylinder was a thin flexible membrane. It vibrated from the sound in the room (voices, footsteps).

The vibrations of the membrane altered the capacity and resonance parameters of the device, slightly shifting the reflected radio signal by frequency and phase. This was the modulation of speech onto the external signal.

Outside the building (like in a KGB car nearby), the retransmitted signal was received and the sound modulation was extracted – effectively capturing the overheard conversation.

Why was this almost impossible to detect? The device had no battery and emitted nothing by itself. It “came to life” only when irradiated with an external radio signal. In standard radio monitoring checks, it remained “dead”. Essentially, it was akin to an ancestor of the RFID tag – a passive device that operates only on external request.

But most interestingly, the inventor was Leon Theremin, the same person behind the musical instrument “thereminvox” (played with hands in the air).

His biography reads like a novel. In the early 1920s, Theremin went to the U.S., patented his thereminvox instrument, and collaborated with RCA; his New York studio was visited by Charlie Chaplin, Albert Einstein, Gershwin, and other notable personalities. It is written that he visited the USSR – Already in 1926, he demonstrated television at the Kremlin.

At that time, televisions with screens the size of a matchbox were being created, but his television had a huge screen (1.5 x 1.5 m) and a resolution of 100 lines. In 1927, the scientist demonstrated his installation to Soviet military leaders K.E. Voroshilov, I.V. Tukhachevsky, and S.M. Budyonny:

state minds watched in horror as Stalin walked through the Kremlin courtyard on the screen.

This sight so frightened them that the invention was immediately classified and quietly buried in the archives, and television was soon invented by the Americans.

Eventually, in 1938, he secretly returned to the USSR, but was soon arrested as a “non-returnee” and sent to the camps, but his talent was still used in the so-called “sharashka” – on projects together with Sergei Korolev, including the development of radio-controlled apparatuses and listening systems, including the aforementioned “Great Seal bug”.

Inside Apple AirPods: Design, Battery, and Antenna Secrets Revealed | August 23 2025, 01:52

Very interesting video about how Apple Airpods headphones work (in the comments). You can read about it, or you can just like this post and go check out the original video in the comments. It has pictures!

Battery. 6 hours of operation, but the capacity is only 2% of the iPhone battery capacity. “Dead zones” in the battery, which lead to reduced operating time, can occur due to sudden temperature changes or even just dropping the headphones on the floor. There is a very dense “layered cake” made from a couple dozen layers of anode-cathode. Batteries of fake AirPods or cheap analogs are much worse. Physics: Poor packaging means less active material and fewer lithium ions moving with each cycle => reduced energy density and increased internal resistance => more energy is lost as heat => battery wears out faster.

Antenna. It is located in the stem because the human head significantly dampens the signal. But there is little space in the stem. Metal strip antenna, size 2 mm by 10 microns(!). That’s thinner than human hair. At such size, it cannot maintain shape on its own. In other consumer electronics, antennas can be etched on the printed circuit board, but this limits them to two dimensions. For the AirPod stem, there isn’t enough space. Therefore, Apple uses a clever solution. They embedded the antenna in the surface of a molded plastic cylindrical part. There, clever conductive plastic is used, with added metal. A laser engraves the exact shape of the antenna in the form of small channels with a rough surface. Then, this groove is subjected to electroplating, first with copper, then covered with gold to protect against corrosion. As a result, a durable conductive track is formed, which matches the 3D geometry of the molded part, which would be impossible to create using traditional machining methods. The plastic not only structurally supports the antenna. Other components are attached to it, such as the cable wrapping around the stem to connect the antenna to the Bluetooth chip, the pressure sensor in the stem.

Microphone. In AirPods, not electret microphones, but MEMS: a microelectronic” version of the condenser type. Well, actually, this is not only Apple – any modern TWS headphones, unless they are the cheapest ones. That is to say, modern microphones are made using the same technology as types – photolithography, layer by layer, only in this case it’s a mechanical device, with calculated cavities and flexible layers. Separately interesting is how they make the cavities – they make holes through which etching solution penetrates inside and dissolves the sacrificial layers of silicon dioxide.

Because of such microscopic size, there are several microphones. But why more than one microphone is needed? At the bottom of the AirPods, you will see a small mesh that allows air to enter the second microphone. When you talk, your voice reaches both microphones, but not at the same time. With a difference of only a few millimeters, the chip can detect a delay of six microseconds between when your voice reaches each microphone. This is enough to determine where the sound is coming from and focus on it. Since it precisely knows the distance the microphones are from one another, the chip can compare each signal and amplify your voice during calls.

The third microphone is for noise cancellation. It is located right in front of the speaker, inside your ear.

The microphones consume about 130 mA, which would quickly drain the battery if they were always active. That’s why they are only turned on when you make a call or use noise cancellation. But AirPods are always waiting for a Siri request. How is this possible without constantly active microphones? Here’s a clever solution. Inside the part that is in your ear, there is a small sensor—an accelerometer. It’s the same type of sensor used in phones to determine orientation. But here it serves a different purpose. Instead of measuring orientation, it senses vibration. When you talk, your voice moves through your jawbone. And this vibration is detected by the accelerometer. This low-power consumption signal is enough to wake up the system and activate the microphones when it senses you want to activate Siri. Imagine that, eh?

The sound in AirPods is tuned not “by ear,” but based on a scientific model of the “ideal sound” (Harman curve), which describes the combination of frequencies most people find most pleasing. For this, there is a complicated system of calculated vents and meshes — to control the air flow, which prevents the occurrence of unpleasant “humming” or sharp sounds inside the ear canal. The larger the cells — more air passes through, smaller — less. Such is the mesh, visible as black things on the white earphone—I thought it was for beauty. No, this is exactly that mesh. But at the same time, some kind of moisture protection must be made, and here the mesh is porous. It is claimed that there is some sort of nano-coating that repels water.

Bluetooth. Why it is so immune to interference. Turns out, it uses frequency-hopping spread spectrum technology (Frequency Hopping). Bluetooth devices quickly switch between different channels many times a second and adapt accordingly.

Uncovering Hidden Hotel Fees: A New York City Experience | August 21 2025, 14:33

Lived in New York on Manhattan for a couple of days recently. The hotel cost 370 USD per day (see photo). Out of which 284 USD is the cost for one day, and the remaining 86 USD are taxes + a mysterious Facility Fee of 35 USD (per day).

From the hotel’s website: “What is a Facility Fee? It’s a hotel service charge! $35 plus tax per day per room provides our guests access to all amenities at Freehand NY, including high-speed WiFi, complimentary 3x filtered water, 24-hour fitness center access, SMART TV connection, priority access to programs and events, and rooftop priority — Broken Shaker!”

Needless to say, these 35 USD were of course not included in the reservation system. It’s not practical to visit every hotel’s website to check for fees before pressing the book button. And yes, the confirmation does state FACILITY FEE TO BE PAID ON ARRIVAL, you can always read and cancel. But for the future, it’s always better to check.

Scam Alert: The Bond Ring Energy Hoax Following My Oura Ring Purchase | August 20 2025, 20:01

I had just bought the Oura Ring 4 when Facebook started running scam ads about the first ring that saps your energy for its own survival. My precious!..

Exploring AI Search Agent: Revolutionizing Automated Browsing and Task Completion | August 19 2025, 01:21

In addition to the main product for search testing, I am developing an AI Search Agent in my leisure time. You only need to provide it with two pieces of information: a website to visit and a goal (described in a short paragraph). In other words, this thing is smart enough to function without any setup – just the site and the goal, and then it’s on its own.

How it works: This virtual agent generates search queries on its own, refines them based on the results obtained (for example, simplifies them), and analyzes how well they match the intended purpose. If suitable results are found, the agent can add items to the cart and place an order — if this is configured in the settings.

I’ve already written about this recently – today is just a slightly nicer demo. It will be even nicer as it is still being pulled from the middle of development, but you can already see how the page is analyzed, and there are initial results that can be used.

The agent can be used for several purposes. Firstly, it’s an excellent way to create ground truth—a set of queries with perfect results. These data can then be used for search testing without involving often slow and expensive large language models (LLM). Secondly, it helps to test the search functions before deploying them to users. Thirdly, the agent generates realistic usage data needed for training recommendation models that require authentic interactions.

The colorful rectangles in the video are the language of interaction of the agent with AI (or LLM). To understand where to click, the system annotates the page and sends a structured description of the page to AI—often along with a screenshot—so it can analyze everything and make a decision about the next action.

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”.

The 55 mph Speed Limit: Energy Crisis and State Autonomy in the U.S. | August 13 2025, 01:32

It turned out that the 55 mph speed limit in the USA was the result of the Emergency Highway Energy Conservation Act, which was adopted in response to the OPEC oil embargo, causing sharp price increases and oil supply disruptions. It was believed that by limiting speed, fuel consumption would be reduced. It worked, but a reduction of 2.2% was predicted, though the actual savings were only about 0.5–1%.

If a state did not comply, it would lose federal funding for the repair and construction of roads. In 1987–1988, Congress allowed states to raise the speed limit to 65 mph on certain rural interstates, and in 1995, the federal “national maximum” was abolished altogether and authority was returned to the states.

Before the national speed limit was introduced, Montana had no set speed limit. Instead, the law stated that a person should drive at a “safe and reasonable speed,” which was essentially determined by a police officer. There is a tale about a NASCAR driver who was stopped for driving about 120 miles per hour on Highway 2 and was not fined because for him 120 mph was considered “safe and reasonable.”

After the imposition of the 55 mph speed limit, Montana resisted as much as it could. The speed limit was a national law, but the consequences for its violation were determined by the states. Montana lowered the speeding fine to $5 and made sure the violation did not go on the driver’s record. It became common practice to put $5 bills over the sun visor and drive at any speed you liked.

There’s even a song from those times, “I Can’t Drive 55” (Sammy Hagar).

By the way, slightly off topic. My Tesla Model Y costs more in taxes (annual registration) than a gasoline car does because there is a special charge, introduced in 2020, to compensate for state revenue lost from the fuel tax — since electric vehicles do not refill with gasoline, and the state under-collects. The amount of this charge is fixed and equals 85% of the equivalent fuel tax a gasoline car driver would have paid given the same average distance and fuel consumption. As a result, electric vehicle owners pay about $128.14 a year (data for 2024–2025). Gasoline car owners pay significantly less. The last time I was stopped by the police in Washington for having an expiration of one and a half years, I had to park the car and urgently arrange payment – it was a few dozen dollars. After paying, I continued on, but with a fine of a couple hundred dollars.

The Art of Illusion in Pricing: Dishwasher Capsules and Subscription Models | August 09 2025, 13:06

An interesting marketing tactic: three different types of dishwasher capsules are sold at the same price: good Complete, premium, and premium plus. Identical packaging, identical prices, but of course, a different number of capsules. For example, platinum has 59 capsules, while the plus version has 47. It seems such odd numbers hardly register in the buyer’s mind, but not every buyer fundamentally thinks about whether it’s important for them to save money. However, if you compare the extreme versions, the platinum plus version is simply twice as expensive as the complete version.

Another interesting example – a subscription to LLM (Chatgpt, Gemini) for $200 a month. It would seem, what fool would pay a couple of hundred for something barely better than the basic for $20-30. But it’s a very sensible decision when you have a market of hundreds of millions of users: most of them are organizations. For an organization, $200 a month is not much different from $20 a month, both are negligible for the budget. Well, okay, even multiplying by hundreds and thousands of subscriptions, there are those who place themselves among slightly more premium clients at a small price for them.

Unexpected Repair Success at a Premium Bike Shop | August 07 2025, 02:41

Today, I had a little odyssey trying to find a place to tune up my bike. It’s a few years old, tired, and in need of attention. I visited three shops, each told me it would take at least a week or two and would cost about 200 dollars. Everyone said there were thirty people ahead of me. Eventually, I took a chance and went to the last shop which I initially thought was too premium and expensive to consider at all: their main inventory includes triathlon Cervelo and Factor bikes with five-digit price tags. But here’s the surprise: they took the bike right away, told me to wait for a call today, and if anything serious—a decision from me would be required. In the evening, they called and told me it was all done, and the cost… just 32 dollars! I’m very glad that I did not have to overpay or wait for weeks.

This goes to show that sometimes, to achieve something, you just need to act contrary to standard patterns of behavior.

Unlocking Smartwatches with Unique Heart Rhythms: A Missed Opportunity? | August 06 2025, 16:43

Why has no one made it so that smartwatches only unlock on the wrist of their owner, reading their unique heartbeat or other biometric data? This is in addition to having the owner’s phone nearby.

Officially, you can’t disable this in the settings of an Apple Watch — Apple intentionally made it such that when you put on the watch for the first time each day, it always requires a code, even if the iPhone is nearby. This is due to security policy: the watch may end up on someone else’s wrist, and the phone may just be nearby.

Moreover, every person has unique heart rhythm patterns, which include, for example, slight variations in the intervals between heartbeats, characteristics of the heart signal shape, and how the heart responds to different stresses. These microscopic differences create a unique picture” of heart rhythm that is difficult to fake or replicate. Watches have quite a lot of time, after being worn and before they are needed unlocked, to collect, process, and decide whether to unlock or not.