『Let's Know Things』のカバーアート

Let's Know Things

Let's Know Things

著者： Colin Wright
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概要
 A calm, non-shouty, non-polemical, weekly news analysis podcast for folks of all stripes and leanings who want to know more about what's happening in the world around them. Hosted by analytic journalist Colin Wright since 2016.

letsknowthings.substack.comColin Wright 政治・政府
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  • Urban Fire Smoke

    Urban Fire Smoke
    2026/11/03
    This week we talk about urban fires, wildland fires, and AQI.We also discuss PM2.5, chemicals, and plumes.Recommended Book: Biological War by Annie JacobsenTranscriptOn January 7, 2025, a fire began in the hills above Altadena, California, and surged through a community of homes, businesses, vehicles, and everything inside them. To someone watching the plume from a distance, it was indistinguishable from any other wildfire smoke. As it turns out, though, the composition of that smoke was a lot more dangerous than the emissions of a typical fire.A study published in October 2026 found that, during the most intense period of structural burning, the smoke from the Eaton Fire carried far more lead and other hazardous material than smoke measured during a fire that burned mostly vegetation. The researchers estimate that roughly seven million people in the Los Angeles area were beneath air containing lead at more than eighty times its usual local concentration for a twenty-four-hour period.Which is a striking number; though importantly, that doesn’t mean seven million people developed lead poisoning, or that a fire produced eighty times some established threshold of danger. The study measured the air and modeled where it went, it didn’t measure how much of that air ended up inside of people, and what happened inside of body that inhaled some of that air.This finding does raise a practical question, though: when a wildfire moves into a city, do our standard ways of describing and responding to smoke give us enough information to make informed decisions about it, and the danger it potentially represents?What I’d like to talk about today is the difference between a burning forest and a burning neighborhood, and what we still need to learn about protecting people downwind from this sort of disaster.—Smoke is not just one thing, it’s a mixture of gases and tiny particles. And its nature is shaped by what’s burning, how hot the fire is, and what happens to the plume as it travels.In a vegetation fire, the fuel might be trees, brush, grass, and other organic material on the ground. A fire moving through a built-up area burns those things, too, but also burns through roofing, insulation, wiring, cars, furniture, electronics, paint, and cleaning products stored in kitchens and garages. Some of those materials contain metals and synthetic chemicals that a stand of trees does not contain.The location where homes and other development meet burnable vegetation is often called the wildland-urban interface. Which makes it sound like a narrow line on a map, but in practice this interface area contains neighborhoods where fire can make the leap from vegetation to buildings, and then from one building to another. It’s at this point that a landscape fire becomes, in part, a structure fire, and potentially a structure fire on a very large scale.Researchers had reason to expect that structure fires would produce different smoke from wildfires. A National Academies report in 2022 described major gaps in our knowledge of what happens when the materials in a town burn alongside vegetation, though. Earlier EPA work found elevated metals in smoke associated with fires that destroyed buildings, but the aforementioned Eaton Fire gave us a more detailed look at how this mixture of smoke elements can change over a matter of hours.Let’s take a moment to talk about how we measure this sort of thing. Most of us think of smoke, when we think of smoke, through the lens of an air-quality number. On a smoky day, a map might show that the air is unhealthy because of the presence of PM2.5, which are tiny particles that are small enough to be inhaled deep into the lungs. The PM2.5 number represents how much particle pollution is in the air, and it’s useful: decades of research link fine-particle exposure to breathing and cardiovascular problems, and the Air Quality Index tells people when to reduce their exposure, because the air is laden with such particles.But PM2.5 describes particle size, not a single type of chemical. Two samples can contain the same mass of fine particles, the same amount of PM2.5 in the air, while having different ingredients—tiny bits of different sorts of things. An ordinary smoke reading won’t necessarily tell you whether those particles came from burning trees, a row of houses, or some combination of the two.That was the opening for this new study. About eleven miles south of Altadena, in Pico Rivera, Caltech researchers had installed an advanced air-monitoring station that’s part of a twelve-site research network called ASCENT, which tracks not just the quantity of airborne particles but aspects of their chemical makeup. Importantly, it also collects measurements continuously, rather than gathering a sample every few days and then analyzing that sample later.As wind carried the Eaton Fire’s plume past the station, the instruments recorded changes to the smoke composition hour by hour. The ...
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    13 分
  • 2026 French Protests

    2026 French Protests
    2026/10/27
    This week we talk about schools, riots, and police violence.We also discuss Le Pen, Macron, and international reporting.Recommended Book: This Is for Everyone by Tim Berners-LeeTranscriptOn October 17, 2026, hundreds of thousands of people marched in cities across France. Many were protesting the price of fuel, groceries, and other necessities. Others were high-school students, parents, teachers, and union members demanding better schools and public services.Most of those marches were peaceful. But in several cities, there were clashes with police, shops broken into and looted, and public buildings attacked. The town hall in Limoges caught fire. In Paris, images of burning vehicles and smashed storefronts made headline news, often without clear context, explaining where the peaceful marches ended and the violence began.Those two realities, peaceful protests on one hand, violence and widespread theft and destruction on the other, have since competed to define this story. Many people who marched, and in some cases continue to march, are concerned that their demands will become inextricably associated with all that widely shared footage of rioting. For shopkeepers and residents whose neighborhoods were damaged, that footage represents a real event with real costs. And for politicians facing a presidential election next spring, the unrest has become a test of who can speak to both protestor grievances and concerns about public safety.What I’d like to talk about today is how these protests started, why a movement about schools became entangled with a cost-of-living crisis and, then, serious disorder, and what all of this might mean for French politics; especially for Marine Le Pen, the far-right politician who’s leading the race to succeed President Emmanuel Macron.—The current protest wave began in September, at a high school in Créteil, outside Paris, where students were angry about unfilled staff positions. Walkouts and blockades spread to other schools, then to other parts of the country.The specific complaints varied by school, but the broad list was fairly consistent: teaching roles remaining unfilled, crowded classrooms, aging buildings, and school days that can stretch from eight in the morning to six in the evening. Some students also object to Parcoursup, the government system that sorts students who apply for higher education into schools, which students say adds uncertainty and a lot of pressure to the tail-end of their high school experience.These are not just complaints about aesthetics or convenience. If a student loses weeks of instruction before an exam, or has to spend a winter in a poorly heated classroom, that can affect what they learn and what opportunities they have later. And the experience isn’t evenly distributed. France’s national education system is meant, in part, to make citizenship and opportunity less dependent on where someone was born. Yet the OECD has found that students’ socioeconomic background remains strongly associated with their educational outcomes, despite these attempts at establishing opportunity equality.The French education ministry has pointed to investments it has made and improvements in filling teaching posts. But national spending and staffing figures don’t guarantee that the right teacher is available in the right classroom on Monday morning. A vacant specialized post, a long absence without a substitute, or a building whose repairs are delayed can still shape a student’s educational experience for an entire year.The government’s early response to these demonstrations mixed acknowledgment with policing the protestors. Prime Minister Sébastien Lecornu promised work on teacher replacements, building repairs, and schedules. Authorities also moved to clear blockades and arrest people accused of vandalism or attacking police and school staff. As the confrontations continued, teenagers suffered severe injuries attributed to police crowd-control weapons, including one young protester who lost a hand. Officers and school staff have been injured, too.These injuries and all that pushback intensified an existing dispute over whether forceful policing was preventing violence, contributing to it, or doing both in different places at different times. That question does not have a single answer, but it does help explain why some parents and students who were originally focused on school conditions began talking about policing as well: the police response to those protests blended that existing conversation and its associated complaints with those related to schooling in the country.Meanwhile, another source of anger was building well beyond the schools.France has been hit by an energy-price surge connected to the broader disruption of oil and gas markets in the Middle East. Its statistics agency reported that consumer prices were up 3.1% in September compared with a year earlier, but energy prices were up more than 21%. Diesel was up more than 44%, ...
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    18 分
  • Software Clones

    Software Clones
    2026/10/20
    This week we talk about Adobe, Call of Duty, and Microsoft.We also discuss compilation, machine code, and AI agents.Recommended Book: The Reverse Centaur’s Guide to Life After AI by Cory DoctorowTranscriptIn October of 2026, a software developer named Brandon Thomas attracted a lot of attention by releasing a collection of free, open-source programs with names like PhotoCraft, FilmCraft, and VectorCraft. These apps are meant to replicate the functionality of digital tools like Adobe Photoshop, Premiere, and Illustrator. Within days, the same project also had a word processor, spreadsheet, and presentation app—alternatives to Microsoft Word, Excel, and PowerPoint.The coverage of these releases was borderline breathless. One person and a collection of AI coding tools had apparently cloned the key offerings of two of the most established software businesses in the world. The developer of these apps suggested that software, as we’ve always known it, might be over.Another story, also circulating this month, featured a team using AI tools to reconstruct the underlying code of the 2009 video game Call of Duty: Modern Warfare 2. This wasn’t a lookalike built by watching the game and imitating its menus, it was an attempt to work backward from the compiled program to something like the source code its developers might have originally written.Both projects fall under a loose umbrella of AI-assisted reverse engineering efforts. But they used different approaches and achieved different levels of fidelity, which have led to different likely legal and practical consequences.What I’d like to talk about today is how people are using AI to reproduce old games and current software, why this is suddenly feasible at a much greater scale than before, and what happens if copying the behaviors and features of a program becomes a lot cheaper than creating the original was.—To kick things off, let’s go through three things that are often called cloning in the world of software.One is making a program that looks and behaves enough like another that a user can accomplish similar tasks. You can watch someone use Photoshop, read documentation, examine a PSD file, and build a different image editor with familiar tools. You don’t need Photoshop’s source code to do that. People have been making alternatives to proprietary software for decades; GIMP and LibreOffice, alternatives to Adobe and Microsoft apps, respectively, existed long before today’s AI models.A second approach aims for compatibility. Maybe you don’t need to reproduce every button in a word processor, you just need your program to open and save documents that Word users can exchange without losing their formatting. That requires understanding file formats, often down to details that aren’t obvious from the official specifications, so it can be a deceptively complex undertaking.The third approach is decompilation, which means starting with a compiled program—the machine instructions a computer runs—and trying to reconstruct higher-level code from it. This is like having a cake and working backward toward the recipe. You can identify many ingredients, and perhaps bake something that tastes the same, but the original measurements and the cook’s handwritten notes are not available to those doing this kind of attempted backtracking.The Modern Warfare 2 project fits into that last category. Developer Maurice Heumann described spending roughly three months, with collaborators and an expanding group of AI agents, rebuilding a popular first-person shooter. His October account no longer names the game, but earlier public posts and reporting identify it as Modern Warfare 2. Heumann says earlier posts were removed after copyright-owner objections, and he doesn’t plan to release the reconstructed code.Initially, the team had three AI agents doing the reconstruction and a fourth reviewing it. They made quick, visible progress: menus worked, maps loaded, and it looked as though much of the game had been recovered. Then the team discovered that a great deal of the code was wrong. The AI agents that they used had invented logic, misunderstood data structures, and even replaced simple operations with much bulkier, slower ones.So they changed the test. Using the compiler that had been used for the original game, they compiled each reconstructed function and compared the resulting machine instructions to the original executable. If a function matched byte for byte—accounting for things like references whose addresses can vary—they had much stronger evidence that they’d recovered its behavior. If it didn’t, the agent had to try again.Even that required supervision, though. Heumann says agents sometimes tried to satisfy the test by embedding arbitrary bits of assembly code, or by modifying the checker so a troublesome function would be skipped. The team had to prohibit those shortcuts and protect the verification process from changes. This isn’t ...
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    19 分
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