Arbitrage Adventures: A Glimpse into Venezuela’s Currency Chaos | January 04 2026, 17:10

I first looked at a map of Venezuela around 15 years ago when you could fly there from Russia for a couple hundred dollars. I studied the map but never used it (though perhaps I should have).

At that time, it was the era of wild currency arbitrage, where the difference between the official bolivar rate “from the TV” and the real price on the black market reached astronomical proportions.

The scheme was simply brilliant: within the country, all airlines were required to sell tickets for local currency at the government rate. If an international flight cost a thousand dollars, it was converted into bolivars at the “pretty” official rate. But if you came off the street with a stack of real dollars and exchanged them at a money changer, the sum in bolivars needed to purchase the same ticket cost just a real hundred dollars, and sometimes even fifty.

The real fun began when intermediaries or acquaintances within the country got involved. You could book a ticket online through a local office, pay for it in bolivars through someone in Caracas, and then simply give them cash dollars when meeting, or transfer to a foreign account. The savings were so absurd that people flew business class simply because it was cheaper than lunch at Miami airport.

But cheap tickets were just the tip of the iceberg, because there was also something known as “raspao”. The state gave every traveler the right to buy a couple of thousand dollars at the cheap official rate on a credit card for spending abroad. Eventually, people bought cheap tickets, flew to the nearest islands, cashed in their currency quota, and returned home virtually rich, having sold these dollars on the black market for many times more.

Of course, this bonanza could not last forever and very quickly ended with a loud crash. Airlines quickly realized that their accounts were filled with millions of worthless-bolivars, which the government flatly refused to exchange for real currency. Planes flew half-empty, although all seats were officially bought out for currency quotas, and the government’s debts to carriers grew to billions of dollars, after which global giants simply began to massively leave the market.

But it worked for a while. I don’t remember exactly, somewhere between 2011 and 2014.

How such a breakdown between the official and unofficial rates lasted so long is beyond comprehension. The government could not quickly abolish the official rate because it supported imports of food and medicine. As soon as they acknowledged the real dollar rate, prices in stores would have skyrocketed immediately (which later happened). Flight tickets merely became a “collateral hole” in the system that everyone used while it was possible.

Dreams of Power: Cocaine, Rare Earth Metals, and Unexpected Diplomacy | January 03 2026, 13:40

I slept through everything. What are you betting on 1) all the cocaine is ours now? 2) they’ll release them in exchange for a deal on rare earth metals and oil? 3) Maduro turns up in Saratov?

Exploring the Monkey Species of Costa Rica’s Forests | December 29 2025, 22:47

In the forests of Costa Rica, several species of monkeys were encountered. The most interesting are the coatis. They live quite high up, but the trail also went up the mountain slope

Exploring Open Data: A Deep Dive into Loudoun County’s 1.5 Million Trees | December 15 2025, 15:40

I’m checking out what open data we have in our county to play with data analysis over the weekend, and discovered, for instance, an open database of all 1.5 million trees in the county. The screenshot shows just a tiny part around my house.

Gold and Gadgets: Tracing Global Influence and Metal Monopolies | October 14 2025, 03:13

Rajesh Exports states on their website that they process 35% of the gold mined on the planet. Of course, they are exaggerating, but overall, India and Rajesh do shape the market. It turns out that 11% of all the gold on the planet is adorned on Indian women. Additionally, it was found that in 1947, 70% of all mined gold was in the USA. From 1934 to 1970, it was legally prohibited for private individuals to own gold in the USA. Approximately 22% of all the gold ever accounted for on the surface of the Earth has been mined from a plateau in South Africa called the Witwatersrand. And if you consider all the gold mined throughout history, it would amount to less than an Olympic swimming pool.

China buys up silver, with India not far behind. Interestingly, platinum is significantly used in the production of catalytic converters for vehicles – almost 40% of the global production goes there. China, of course, holds much of this production.

Practically every smartphone, tablet, or touchscreen monitor that we use is coated with a thin layer of indium tin oxide (ITO). This material has a unique combination of properties: it is almost completely transparent while also conducting electricity excellently. This allows the screen to register your touches.

Although lithium is now strongly associated with batteries, historically and still today, a significant portion of it is used in the production of glass and ceramics.

Understanding Road Grade: The Math Behind the 10% Incline Sign | June 30 2025, 19:48

It turns out that the incline (incline, or grade) – the steepness of a road or slope – has quite an obvious definition, but I never really thought about it. It means the ratio of the projection of a line on the terrain to the vertical plane to the projection of the same line on the horizontal. In other words, the magnitude of the incline equals the tangent of the angle between the rise of the slope and the horizontal (the tangent of the angle of inclination).

Thus, a “steep climb” sign of 10% indicates just about 5.71 degrees of inclination. This is arctan(0.1).

It also turned out that formally among specialists when reading the notation, the “%” sign is pronounced as “hundredths.”