Let's Know Things

• Climate Risk

  This week we talk about floods, wildfires, and reinsurance companies.We also discuss the COP meetings, government capture, and air pollution.Recommended Book: If Anyone Builds It, Everyone Dies by Eliezer Yudkowsky and Nate Soares TranscriptThe urban area that contains India’s capital city, New Delhi, called the National Capital Territory of Delhi, has a population of around 34.7 million people. That makes it the most populous city in the country, and one of the most populous cities in the world.Despite the many leaps India has made over the past few decades, in terms of economic growth and overall quality of life for residents, New Delhi continues to have absolutely abysmal air quality—experts at India’s top research hospital have called New Delhi’s air “severe and life-threatening,” and the level of toxic pollutants in the air, from cars and factories and from the crop-waste burning conducted by nearby farmers, can reach 20-times the recommended level for safe breathing.In mid-November 2025, the problem became so bad that the government told half its workers to work from home, because of the dangers represented by the air, and in the hope that doing so would remove some of the cars on the road and, thus, some of the pollution being generated in the area.Trucks spraying mist, using what are called anti-smog guns, along busy roads and pedestrian centers help—the mist keeping some of the pollution from cars from billowing into the air and becoming part of the regional problem, rather than an ultra-localized one, and pushing the pollutants that would otherwise get into people’s lungs down to the ground—though the use of these mist-sprayers has been controversial, as there are accusations that they’re primarily deployed near air-quality monitoring stations, and that those in charge put them there to make it seem like the overall air-quality is lower than it is, manipulating the stats so that their failure to improve practical air-quality isn’t as evident.And in other regional news, just southeast across the Bay of Bengal, the Indonesian government, as of the day I’m recording this, is searching for the hundreds of people who are still missing following a period of unusually heavy rains. These rains have sparked floods and triggered mudslides that have blocked roads, damaged bridges, and forced the evacuation of entire villages. More than 300,000 people have been evacuated as of last weekend, and more rain is forecast for the coming days.The death toll of this round of heavy rainfall—the heaviest in the region in years—has already surpassed 440 people in Indonesia, with another 160 and 90 in Thailand and Vietnam, respectively, being reported by those countries’ governments, from the same weather system.In Thailand, more than two million people were displaced by flooding, and the government had to deploy military assets, including helicopters launched from an aircraft carrier, to help rescue people from the roofs of buildings across nine provinces.In neighboring Malaysia, tens of thousands of people were forced into shelters as the same storm system barreled through, and Sri Lanka was hit with a cyclone that left at least 193 dead and more than 200 missing, marking one of the country’s worst weather disasters in recent years.What I’d like to talk about today is the climatic moment we’re at, as weather patterns change and in many cases, amplify, and how these sorts of extreme disasters are also causing untold, less reported upon but perhaps even more vital, for future policy shifts, at least, economic impacts.—The UN Conference of the Parties, or COP meetings, are high-level climate change conferences that have typically been attended by representatives from most governments each year, and where these representatives angle for various climate-related rules and policies, while also bragging about individual nations’ climate-related accomplishments.In recent years, such policies have been less ambitious than in previous ones, in part because the initial surge of interest in preventing a 1.5 degrees C increase in average global temperatures is almost certainly no longer an option; climate models were somewhat accurate, but as with many things climate-related, seem to have actually been a little too optimistic—things got worse faster than anticipated, and now the general consensus is that we’ll continue to shoot past 1.5 degrees C over the baseline level semi-regularly, and within a few years or a decade, that’ll become our new normal.The ambition of the 2015 Paris Agreement is thus no longer an option. We don’t yet have a new, generally acceptable—by all those governments and their respective interests—rallying cry, and one of the world’s biggest emitters, the United States, is more or less absent at new climate-related meetings, except to periodically show up and lobby for lower renewables goals and an increase in subsidies for and policies that favor the fossil fuel industry.The increase in both number and potency of climate-influenced natural disasters is partly the result of this failure to act, and act forcefully and rapidly enough, by governments and by all the emitting industries they’re meant to regulate.The cost of such disasters is skyrocketing—there are expected to be around $145 billion in insured losses, alone, in 2025, which is 6% higher than in 2024—and their human impact is booming as well, including deaths and injuries, but also the number of people being displaced, in some cases permanently, by these disasters.But none of that seems to move the needle much in some areas, in the face of entrenched interests, like the aforementioned fossil fuel industry, and the seeming inability of politicians in some nations to think and act beyond the needs of their next election cycle.That said, progress is still being made on many of these issues; it’s just slower than it needs to be to reach previously set goals, like that now-defunct 1.5 degrees C ceiling.Most nations, beyond petro-states like Russia and those with fossil fuel industry-captured governments like the current US administration, have been deploying renewables, especially solar panels, at extraordinary rates. This is primarily the result of China’s breakneck deployment of solar, which has offset a lot of energy growth that would have otherwise come from dirty sources like coal in the country, and which has led to a booming overproduction of panels that’s allowed them to sell said panels cheap, overseas.Consequently, many nations, like Pakistan and a growing number of countries across Sub-Saharan African, have been buying as many cheap panels as they can afford and bypassing otherwise dirty and unreliable energy grids, creating arrays of microgrids, instead.Despite those notable absences, then, solar energy infrastructure installations have been increasing at staggering rates, and the first half of 2025 has seen the highest rate of capacity additions, yet—though China is still installing twice as much solar as the rest of the world, combined, at this point. Which is still valuable, as they still have a lot of dirty energy generation to offset as their energy needs increase, but more widely disseminated growth is generally seen to be better in the long-term—so the expansion into other parts of the world is arguably the bigger win, here.The economics of renewables may, at some point, convince even the skeptics and those who are politically opposed to the concept of renewables, rather than practically opposed to them, that it’s time to change teams. Already, conservative parts of the US, like Texas, are becoming renewables boom-towns, quietly deploying wind and solar because they’re often the best, cheapest, most resilient options, even as their politicians rail against them in public and vote for more fossil fuel subsidies.And it may be economics that eventually serve as the next nudge, or forceful shove on this movement toward renewables, as we’re reaching a point at which real estate and the global construction industry, not to mention the larger financial system that underpins them and pretty much all other large-scale economic activities, are being not just impacted, but rattled at their roots, by climate change.In early November 2025, real estate listing company Zillow, the biggest such company in the US, stopped showing extreme weather risks for more than a million home sale listings on its site.It started showing these risk ratings in 2024, using data from a risk-modeling company called First Street, and the idea was to give potential buyers a sense of how at-risk a property they were considering buying might be when it comes to wildfires, floods, poor air quality, and other climate and pollution-related issues.Real estate agents hated these ratings, though, in part because there was no way to protest and change them, but also because, well, they might have an expensive coastal property listed that now showed potential buyers it was flood prone, if not today, in a couple of years. It might also show a beautiful mountain property that’s uninsurable because of the risk of wildfire damage.A good heuristic for understanding the impact of global climate change is not to think in terms of warming, though that’s often part of it, but rather thinking in terms of more radical temperature and weather swings.That means areas that were previously at little or no risk of flooding might suddenly be very at risk of absolutely devastating floods. And the same is true of storms, wildfires, and heat so intense people die just from being outside for an hour, and in which components of one’s house might fry or melt.This move by Zillow, the appearance and removal of these risk scores, happened at the same time global insurers are warning that they may have to pull out of more areas, because it’s simply no longer possible for them to do business in places where these sorts devastating weather events are happening so regularly, but often unpredictably, and with such intensity—and where the landscapes, ecologies, and homes are not made to withstand such things; all that stuff came of age or was built in another climate reality, so many such assets are simply not made for what’s happening now, and what’s coming.This is of course an issue for those who already own such assets—homes in newly flood-prone areas, for instance—because it means if there’s a flood and a home owner loses their home, they may not be able to rebuild or get a payout that allows them to buy another home elsewhere. That leaves some of these assets stranded, and it leaves a lot of people with a huge chunk of their total resources permanently at risk, unable to move them, or unable to recoup most of their investment, shifting that money elsewhere. It also means entires industries could be at risk, especially banks and other financial institutions that provide loans for those who have purchased homes and other assets in such regions.An inability to get private insurance also means governments will be increasingly on the hook for issuing insurance of last resort to customers, which often costs more, but also, as we’ve seen with flood insurance in the US, means the government tends to lose a lot of money when increasingly common, major disasters occur on their soil.This isn’t just a US thing, though; far from it. Global reinsurers, companies that provide insurance for insurance companies, and whose presence and participation in the market allow the insurance world to function, Swiss Re and Munich Re, recently said that uninsurable areas are growing around the world right now, and lacking some kind of fundamental change to address the climate paradigm shift, we could see a period of devastation in which rebuilding is unlikely or impossible, and a resultant period in which there’s little or no new construction because no one wants to own a home or factory or other asset that cannot be insured—it’s just not a smart investment.This isn’t just a threat to individual home owners, then, it’s potentially a threat to the whole of the global financial system, and every person and business attached to it, which in turn is a threat to global governance and the way property and economics work.There’s a chance the worst-possible outcomes here can still be avoided, but with each new increase in global average temperature, the impacts become worse and less predictable, and the economics of simply making, protecting, and owning things become less and less favorable.Show Noteshttps://www.nytimes.com/2025/11/30/climate/zillow-climate-risk-scores-homes.htmlhttps://www.nytimes.com/2025/11/30/climate/climate-change-disinformation.htmlhttps://www.nytimes.com/2025/11/30/world/asia/india-delhi-pollution.htmlhttps://www.nytimes.com/2025/11/30/world/asia/flooding-indonesia-thailand-southeast-asia.htmlhttps://www.bbc.com/news/articles/c5y9ejley9dohttps://www.theguardian.com/environment/2025/nov/22/cop30-deal-inches-closer-to-end-of-fossil-fuel-era-after-bitter-standoffhttps://theconversation.com/the-world-lost-the-climate-gamble-now-it-faces-a-dangerous-new-reality-270392https://theconversation.com/earth-is-already-shooting-through-the-1-5-c-global-warming-limit-two-major-studies-show-249133https://www.404media.co/americas-polarization-has-become-the-worlds-side-hustle/https://www.cnbc.com/2025/08/08/climate-insurers-are-worried-the-world-could-soon-become-uninsurable-.htmlhttps://www.imd.org/ibyimd/sustainability/climate-change-the-emergence-of-uninsurable-areas-businesses-must-act-now-or-pay-later/https://www.jec.senate.gov/public/index.cfm/democrats/2024/12/climate-risks-present-a-significant-threat-to-the-u-s-insurance-and-housing-marketshttps://www.weforum.org/stories/2025/04/financial-system-warning-climate-nature-stories-this-week/https://www.weforum.org/stories/2025/05/costs-climate-disasters-145-billion-nature-climate-news/https://arstechnica.com/science/2025/11/solars-growth-in-us-almost-enough-to-offset-rising-energy-use/https://ember-energy.org/latest-updates/global-solar-installations-surge-64-in-first-half-of-2025/ This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit letsknowthings.substack.com/subscribe

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  16:04
• Thorium Reactors

  This week we talk about radioactive waste, neutrons, and burn while breeding cycles.We also discuss dry casks, radioactive decay, and uranium.Recommended Book: Breakneck by Dan WangTranscriptRadioactive waste, often called nuclear waste, typically falls into one of three categories: low-level waste that contains a small amount of radioactivity that will last a very short time—this is stuff like clothes or tools or rags that have been contaminated—intermediate-level waste, which has been contaminated enough that it requires shielding, and high-level waste, which is very radioactive material that creates a bunch of heat because of all the radioactive decay, so it requires both shield and cooling.Some types of radioactive waste, particularly spent fuel of the kind used in nuclear power plants, can be reprocessed, which means separating it into other types of useful products, including another type of mixed nuclear fuel that can be used in lieu of uranium, though generally not economically unless uranium supplies are low. About a third of all spent nuclear fuel has already been reprocessed in some way.About 4% of even the recyclable stuff, though, doesn’t have that kind of second-life purpose, and that, combined with the medium- and long-lived waste that is quite dangerous to have just sitting around, has to be stored somehow, shielded and maybe cooled, and in some cases for a very long time: some especially long-lived fission products have half-lives that stretch into the hundreds of thousands or millions of years, which means they will be radioactive deep into the future, many times longer than humans have existed as a species.According to the International Atomic Energy Agency, something like 490,000 metric tons of radioactive spent fuel is currently being stored, on a temporary basis, at hundreds of specialized sites around the world. The majority of this radioactive waste is stored in pools of spent fuel water, cooled in that water somewhere near the nuclear reactors where the waste originated. Other waste has been relocated into what’re called dry casks, which are big, barrel-like containers made of several layers of steel, concrete, and other materials, which surround a canister that holds the waste, and the canister is itself surrounded by inert gas. These casks hold and cool waste using natural air convection, so they don’t require any kind of external power or water sources, while other solutions, including storage in water, sometimes does—and often the fuel is initially stored in pools, and is then moved to casks for longer-term storage.Most of the radioactive waste produced today comes in the form of spend fuel from nuclear reactors, which are typically small ceramic pellets made of low-enriched uranium oxide. These pellets are stacked on top of each other and encased in metal, and that creates what’s called a fuel rod.In the US, alone, about 2,000 metric tons of spent nuclear fuel is created each year, which is just shy of half an olympic sized swimming pool in terms of volume, and in many countries, the non-reuseable stuff is eventually buried, near the surface for the low- to intermediate-level waste, and deeper for high-level waste—deeper, in this context, meaning something like 200-1000 m, which is about 650-3300 feet, beneath the surface.The goal of such burying is to prevent potential leakage that might impact life on the surface, while also taking advantage of the inherent stability and cooler nature of underground spaces which are chosen for their isolation, natural barriers, and water impermeability, and which are also often reinforced with human-made supports and security, blocking everything off and protecting the surrounding area so nothing will access these spaces far into the future, and so that they won’t be broken open by future glaciation or other large-scale impacts, either.What I’d like to talk about today is another potential use and way of dealing with this type of waste, and why a recent, related development in China is being heralded as such a big deal.—An experimental nuclear reactor was built in the Gobi Desert by the Chinese Academy of Sciences Shanghai Institute of Applied Physics, and back in 2023 the group achieved its first criticality, got started up, basically, and it has been generating heat through nuclear fission ever since.What that means is that the nuclear reactor did what a nuclear reactor is supposed to do. Most such reactors exist to generate heat, which then creates steam and spins turbines, which generates electricity.What’s special about this reactor, though, is that it is a thorium molten salt reactor, which means it uses thorium instead of uranium as a fuel source, and the thorium is processed into uranium as part of the energy-making process, because thorium only contains trace amounts of fissile material, which isn’t enough to get a power-generating, nuclear chain reaction going.This reactor was able to successfully perform what’s called in-core thorium-to-uranium conversion, which allows the operators to use thorium as fuel, and have that thorium converted into uranium, which is sufficiently fissile to produce nuclear power, inside the core of the reactor. This is an incredibly fiddly process, and requires that the thorium-232 used as fuel absorb a neutron, which turns it into thorium-233. Thorium-233 then decays into protactinium-233, and that, in turn, decays into uranium-233—the fuel that powers the reactor.One innovation here is that this entire process happens inside the reactor, rather than occurring externally, which would require a bunch of supplementary infrastructure to handle fuel fabrication, increasing the amount of space and cost associated with the reactor.Those neutrons required to start the thorium conversion process are provided by small amounts of more fissile material, like enriched uranium-235 or plutonium-239, and the thorium is dissolved in a fluoride salt and becomes a molten mixture that allows it to absorb that necessary neutron, and go through that multi-step decay process, turning into uranium-233. That end-point uranium then releases energy through nuclear fission, and this initiates what’s called a burn while breeding cycle, which means it goes on to produce its own neutrons moving forward, which obviates the need for those other, far more fissile materials that were used to start the chain reaction. All of which makes this process a lot more fuel efficient than other options, dramatically reduces the amount of radioactive waste produced, and allows reactors that use it to operate a lot longer without needing to refuel, which also extends a reactor’s functional life.On that last point, many typical nuclear power plants built over the past handful of decades use pressurized water reactors which have to be periodically shut down so operators can replace spent fuel rods. This new method instead allows the fissile materials to continuously circulate, enabling on-the-fly refueling—so no shut-down, no interruption of operations necessary.This method also requires zero water, which could allow these reactors to be built in more and different locations, as conventional nuclear power plants have typically been built near large water sources, like oceans, because of their cooling needs.China initiated the program that led to the development of this experimental reactor back in 2011, in part because it has vast thorium reserves it wanted to tap in its pursuit of energy independence, and in part because this approach to nuclear energy should, in theory at least, allow plant operators to use existing, spent fuel rods as part of its process, which could be very economically interesting, as they could use the waste from their existing plants to help fuel these new plants, but also take such waste off other governments’ hands, maybe even be paid for it, because those other governments would then no longer need to store the stuff, and China could use it as cheap fuel; win win.Thinking further along, though, maybe the real killer application of this technology is that it allows for the dispersion of nuclear energy without the risk of nuclear weapons proliferation. The plants are smaller, they have a passive safety system that disallows the sorts of disasters that we saw in Chernobyl and Three-Mile Island—that sort of thing just can’t happen with this setup—and the fissile materials, aside from those starter materials used to get the initial cycle going, can’t be used to make nuclear weapons.Right now, there’s a fair amount of uranium on the market, but just like oil, that availability is cyclical and controlled by relatively few governments. In the future, that resource could become more scarce, and this reactor setup may become even more valuable as a result, because thorium is a lot cheaper and more abundant, and it’s less tightly controlled because it’s useless from a nuclear weapons standpoint.This is only the very first step on the way toward a potentially thorium-reactor dominated nuclear power industry, and the conversion rate on this experimental model was meager.That said, it is a big step in the right direction, and a solid proof-of-concept, showing that this type of reactor has promise and would probably work scaled-up, as well, and that means the 100MW demonstration reactor China is also building in the Gobi, hoping to prove the concept’s full value by 2035, stands a pretty decent chance of having a good showing.Show Noteshttps://www.deepisolation.com/about-nuclear-waste/where-is-nuclear-waste-nowhttps://www.energy.gov/ne/articles/5-fast-facts-about-spent-nuclear-fuelhttps://www.energy.gov/ne/articles/3-advanced-reactor-systems-watch-2030https://world-nuclear.org/information-library/nuclear-fuel-cycle/nuclear-waste/radioactive-wastes-myths-and-realitieshttps://www.visualcapitalist.com/visualizing-all-the-nuclear-waste-in-the-world/https://en.wikipedia.org/wiki/High-level_radioactive_waste_managementhttps://en.wikipedia.org/wiki/Radioactive_wastehttps://en.wikipedia.org/wiki/Nuclear_reprocessinghttps://en.wikipedia.org/wiki/Dry_cask_storagehttps://en.wikipedia.org/wiki/Deep_geological_repositoryhttps://onlinelibrary.wiley.com/doi/abs/10.1002/er.3854https://archive.is/DQpXMhttps://en.wikipedia.org/wiki/Thorium-based_nuclear_powerhttps://en.wikipedia.org/wiki/Thorium_fuel_cycle This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit letsknowthings.substack.com/subscribe

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  12:42
• Extrajudicial Killing

  This week we talk about Venezuela, casus belli, and drug smuggling.We also discuss oil reserves, Maduro, and Machado.Recommended Book: Dungeon Crawler Carl by Matt DinnimanTranscriptVenezuela, which suffered all sorts of political and economic crises under former president Hugo Chávez, has suffered even more of the same, and on a more dramatic scale, under Chávez’s successor, Nicolás Maduro.Both Chávez and Maduro have ruled over autocratic regimes, turning ostensibly democratic Venezuelan governments into governments ruled by a single person, and those they like and empower and reward, over time removing anyone from power who might challenge them, and collapsing all checks and balances within the structure of their government.They still hold elections, then, but like in Russia, the voting is just for show, the outcome predetermined, and anyone who gets too popular and who isn’t favored by the existing regime is jailed or killed or otherwise neutralized; the votes are then adjusted when necessary to make it look like the regime is still popular, and anyone who challenges that seeming popularity is likewise taken care of.As a result of that state of affairs, an unpopular regime with absolute power running things into the ground over the course of two autocrats’ administrations, Venezuela has suffered immense hyperinflation, high levels of crime and widespread disease, ever-increasing mortality rates, and even starvation, as fundamentals like food periodically become scarce. This has led to a swell of emigration out of the country, which has, during the past decade, become the largest ever recorded refugee crisis in the Americas, those who leave mostly flooding into neighboring countries like Colombia, Peru, and Ecuador.As of 2025, it’s estimated that nearly 8 million people, more than 20% of Venezuela’s entire population as of 2017, has fled the country to get away from the government, its policies, its collapsed economy, and the cultural homogeny that has led to so much crime, conflict, and oppression of those not favored by the people in charge.This has also led to some Venezuelans trying to get into the US, which was part of the justification for a proposed invasion of the country, by the US government, under the first Trump administration in 2017.The idea was that this is a corrupt, weak government that also happens to possess the largest proven oil reserves in the world. Its production of oil has collapsed along with everything else, in part because the government is so ineffectual, and in part because of outside forces, like longstanding sanctions by the US, which makes selling and profiting from said oil on the global market difficult.Apparently, though, Trump also just liked the idea of invading Venezuela through US ally Colombia, saying—according to Trump’s National Security advisor at the time, John Bolton—that Venezuela is really part of the US, so it would be “cool” for the US to take it. Trump also later said, in 2023, that when he left office Venezuela was about to collapse, and that he would have taken it over if he had been reelected instead of losing to Joe Biden, and the US would have then kept all the country’s oil.So there’s long been a seeming desire by Trump to invade Venezuela, partly on vibe grounds, the state being weak and why shouldn’t we own it, that kind of thing? But underlying that is the notion of the US being a country that can stomp into weaker countries, take their oil, and then nation-build, similar to what the government seemed to be trying to do when it invaded Iraq in the early 2000s, using 9/11 as a casus belli, an excuse to go to war, with an uninvolved nation that happened to own a bunch of oil resources the US government wanted for itself.What I’d like to talk about today is the seeming resurgence of that narrative, but this time with an, actual tangible reason to believe an invasion of Venezuela might occur sometime soon.—As I mentioned, though previously kind of a success story in South America, bringing people in from all over the continent and the world, Venezuela has substantially weakened under its two recent autocratic leaders, who have rebuilt everything in their image, and made corruption and self-serving the main driver behind their decisions for the direction of the country.A very popular candidate, María Corina Machado, was barred from participating in the country’s 2024 election, the country’s Supreme Court ruling that a 15-year ban on her holding public office because of her involvement with an alleged plot against Maduro with a previous candidate for office, Juan Guaido; Guiado is now in exile, run out of the country for winning an election against Maduro, which Maduro’s government has claimed wasn’t legit, but which dozens of governments recognize as having been legitimate, despite Maduro’s clinging to power after losing.So Machado is accused of being corrupt by Maduro’s corrupt government, and thus isn’t allowed to run for office. Another candidate that she wanted to have run in her place was also declared ineligible by Maduro’s people, so another sub was found, Edmundo González, and basically every outside election watchdog group says that he won in 2024, and handedly, over Maduro. But the government’s official results say that’s not the case, that Maduro won, and that has created even more conflict and chaos in the country as it’s become clearer and clearer that there’s no way to oust the autocrat in control of the government—not through the voting box, at least.This is part of what makes Venezuela an even more appealing target, for the Trump administration, right now, because not only is Maduro incredibly unpopular and running the country into the ground, there’s also a very popular alternative, in the shape of María Corina Machado, who could conceivably take control of things should Maduro be toppled. So there’s a nonzero chance that if someone, like the US military, were to step in and either kill Maduro or run him out of town, they could make a very sweet deal with the incoming Machado government, including a deal that grants access to all that currently underutilized oil wealth.This is theoretical right now, but recent moves by the US government and military suggest it might not remain theoretical for much longer.In mid-November, 2025, the US Navy moved the USS Gerald R. Ford Carrier Strike Group to the Caribbean—the USS Gerald R Ford being an aircraft carrier, and the strike group being the array of ships and aircraft that accompany it—it was moved there from the Eastern Mediterranean, where it was moved following the attack on Israel that led to Israel’s invasion of the Gaza Strip.This, by itself, doesn’t necessarily mean anything; the shifting of aircraft carrier groups is often more symbolic than practical. But the US government has suggested it might us these vessels and aircraft to strike drug manufacturers across South and Central America, and specifically in Venezuela.This is being seen as an escalation of an already fraught moment in the region, because the US has launched a series of strikes against small boats in the area, beginning back in September of 2025.These boats, according to the US government, are drug smuggling vessels, bringing fentanyl, among other drugs, to US shores. So the idea is that the people aboard these boats are criminals who are killing folks in the US by bringing this drug, which is highly addictive and super potent, and thus more likely to kill its users than other opioids, into the country for illegal sale and distribution. So, the claim goes, this is a justified use of force.These strikes have thus far, over the past two months, killed at least 79 people, all alleged by the US government to be drug smugglers, despite some evidence to the contrary, in some cases. The US’s allies have not been happy about these strikes, including allies the government usually relies on to help with drug-related detection and interdiction efforts, including regional governments that take action to keep drugs from shuffling around the region and eventually ending up in the US.Many US allies have also called the strikes illegal. The French foreign minister recently said they violate international law, and the EU’s foreign policy chief said something similar, indicating that such use of force is only valid in cases of self-defense, and when there’s a UN Security council resolution on the matter.Canadian and Dutch governments have been doing what they can to distance themselves from the strikes, without outright criticizing the at times vindictive US government, and some regional allies, like Colombia, have been signaling that they’ll be less cooperative with the US when it comes to drug-related issues, saying that they would no longer share intelligence with the US until they stop the strikes, which they’ve called “extrajudicial executions.”An extrajudicial killing is one that is not lawful; it doesn’t have the backing of a judicial proceeding, and thus lacks the authority typically granted by the proper facets of a government. Lacking such authority, killing is illegal. Given said authority, though, a killing can be made legal, at least according to the laws of the government doing the killing.The argument here is that while governments can usually get away with killing people, only authoritarian regimes typically and regularly to use that power to kill folks without going through the proper channels and thus getting the legal authority to do so.In this case, the facts seem to support the accusations of those who are saying these killings aren’t legally legitimate: the Trump administration has launched these attacks on these vessels without going through the usual channels, and without declaring Congressionally approved war on anyone in particular. They’ve instead claimed that drug cartels are terrorists, and have said that anyone they suspect of smuggling drugs, or who they suspect in any way might be involved with the illegal drug making and smuggling industry, can be considered enemy, non-state combatants that they’re allowed to kill at will.And as part of that declaration that the US government has the right to kill anyone they like who’s involved in drug smuggling, in late-October 2025 it was reported that the US has identified targets on land, as well, some of these targets located within ports and airstrips across Venezuela, including those used by the Venezuelan government, which the Maduro regime allegedly also uses for drug smuggling purposes.This loops us back around to that original possibility that the Trump administration, looking for a casus belli, an excuse to go to war with Venezuela, may be using these strikes and the drug smuggling industry to get social and maybe legal backing for strikes that reach closer and closer to Maduro and the Venezuelan military.If the US were to strike some vital Venezuelan military ports, using drug smuggling as justification, but taking out Venezuelan military infrastructure and/or people in the process, would that be an act of war? Would that trigger a response from Maduro? Could that response then allow the US military to claim self-defense?These questions are up in the air right now, and that confusion could provide the opportunity to move fast and not have to suffer legal consequences until all is said and done, but it could also help shape the outcome of those decisions: ask for forgiveness, not permission, basically, but maybe not even forgiveness, if other aspects of the government come to support the Trump administration’s decisions and rule in their favor, after the fact.Some analysts have said they suspect this drumbeat toward war with Venezuela is meant to solve several problems for the Trump administration. It could help them deal with plummeting approval numbers leading into a midterm election in 2026, and it could also give Trump himself cover from the escalating issue of the Epstein files, which, among other things, seem to connect Trump with someone who’s become the world’s most famous human trafficker and pedophile even more tightly than before.This sort of process may also serve to slowly bolster the perception that the presidency has more powers than it has traditionally wielded, like the ability to unilaterally declare war, even though such powers are supposed to rest with Congress; an extension of other efforts by this administration to reinforce the presidency at the expense of the checks and balances that are meant to keep the US government from becoming an autocracy, like the one in Venezuela.Show Noteshttps://www.lemonde.fr/en/international/article/2024/01/27/venezuela-s-supreme-court-disqualifies-opposition-leader-from-running-for-president_6469941_4.htmlhttps://www.theguardian.com/world/article/2024/aug/06/venezuela-election-maduro-analysishttps://en.wikipedia.org/wiki/2024_Venezuelan_presidential_electionhttps://en.wikipedia.org/wiki/Carrier_Strike_Group_12https://www.cnn.com/2025/11/15/politics/venezuela-trump-military-what-we-knowhttps://www.cnn.com/2025/11/12/americas/venezuela-us-aircraft-carrier-reaction-latam-intlhttps://www.nytimes.com/2025/11/14/us/politics/trump-pressure-venezuela.htmlhttps://www.npr.org/2025/11/15/nx-s1-5609888/aircraft-carrier-caribbean-venezuela-military-actionhttps://www.theguardian.com/commentisfree/2025/nov/16/us-rogue-state-extrajudicial-killings-venezuelahttps://www.politico.com/news/magazine/2025/11/15/trump-maduro-venezuela-column-00652369https://www.wsj.com/politics/national-security/justice-department-drug-boat-strike-memo-83711582https://www.nytimes.com/2025/11/13/world/americas/trump-drug-boat-strikes-colombian-fisherman.htmlhttps://www.bbc.com/news/articles/c7810w37vwdohttps://www.militarytimes.com/news/your-military/2025/11/13/colombia-to-suspend-intelligence-sharing-with-us-over-boat-strikes/https://en.wikipedia.org/wiki/2025_United_States_military_strikes_on_alleged_drug_traffickershttps://www.theatlantic.com/newsletters/2025/11/trump-boat-strikes-killings-venezuela/684921/https://www.wsj.com/world/americas/trump-boat-strikes-drug-9bbbeb90?mod=hp_lead_pos11https://en.wikipedia.org/wiki/Extrajudicial_killinghttps://en.wikipedia.org/wiki/Crisis_in_Venezuelahttps://en.wikipedia.org/wiki/Venezuelan_refugee_crisishttps://en.wikipedia.org/wiki/Proposed_United_States_invasion_of_Venezuela This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit letsknowthings.substack.com/subscribe

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• Nitazenes

  This week we talk about OxyContin, opium, and the British East India Company.We also discuss isotonitazene, fentanyl, and Perdue.Recommended Book: The Thinking Machine by Stephen WittTranscriptOpioids have been used as painkillers by humans since at least the Neolithic period; there’s evidence that people living in the Iberian and Italian Peninsulas kept opium poppy seeds with them, and there’s even more evidence that the Ancient Greeks were big fans of opium, using it to treat pain and as a sleep aid.Opium was the only available opioid for most of human history, and it was almost always considered to be a net-positive, despite its downsides. It was incorporated into a mixture called laudanum, which was a blend of opium and alcohol, in the 17th century, and that helped it spread globally as Europeans spread globally, though it was also in use locally, elsewhere, especially in regions where the opium poppy grew naturally.In India, for instance, opium was grown and often used for its painkilling properties, but when the British East India Company took over, they decided to double-down on the substance as a product they could monopolize and grow into a globe-spanning enterprise.They went to great lengths to expand production and prevent the rise of potential competitors, in India and elsewhere, and they created new markets for opium in China by forcing the product onto Chinese markets, initially via smuggling, and then eventually, after fighting a series of wars focused on whether or not the British should be allowed to sell opium on the Chinese market, the British defeated the Chinese. And among other severely unbalanced new treaties, including the ceding of the Kowloon peninsula to the British as part of Hong Kong, which they controlled as a trading port, and the legalization of Christians coming into the country, proselytizing, and owning property, the Chinese were forced to accept the opium trade. This led to generations of addicts, even more so than before, when opium was available only illicitly, and it became a major bone of contention between the two countries, and informed China’s relationship with the world in general, especially other Europeans and the US, moving forward.A little bit later, in the early 1800s, a German pharmacist was able to isolate a substance called morphine from opium. He published a paper on this process in 1817, and in addition to this being the first alkaloid, the first organic compound of this kind to be isolated from a medicinal plant, which was a milestone in the development of modern drug discovery, it also marked the arrival of a new seeming wonder drug, that could ease pain, but also help control cold-related symptoms like coughing and gut issues, like diarrhea. Like many such substances back in the day, it was also often used to treat women who were demonstrating ‘nervous character,’ which was code for ‘behaving in ways men didn’t like or understand.’Initially, it was thought that, unlike with opium, morphine wasn’t addictive. And this thinking was premised on the novel application method often used for morphine, the hypermedia needle, which arrived a half-century after that early 1800s isolation of morphine from opium, but which became a major driver of the new drug’s success and utility. Such drugs, derived scientifically rather than just processing a plant, could be administered at specific, controllable doses. So surely, it was thought, this would alleviate those pesky addictive symptoms that many people experienced when using opioids in a more natural, less science-y way.That, of course, turned out not to be the case. But it didn’t stop the progression of this drug type, and the further development of more derivations of it, including powerful synthetic opioids, which first hit the scene in the mid-20th century.What I’d like to talk about today is the recent wave of opioid addictions, especially but not exclusively in the US, and the newest concern in this space, which is massively more powerful than anything that’s come before.—As I mentioned, there have been surges in opioid use, latent and externally forced, throughout modern human history.The Chinese saw an intense wave of opioid addiction after the British forced opium onto their markets, to the point that there was a commonly held belief that the British were trying to overthrow and enslave the Chinese by weighing them down with so many addicts who were incapable of doing much of anything; which, while not backed by the documentation we have from the era—it seems like they were just chasing profits—is not impossible, given what the Brits were up to around the world at that point in history.That said, there was a huge influx in opioid use in the late-1980s, when a US-based company called Purdue Pharma began producing and pushing a time-released opioid medication, which really hit the big-time in 1995, when they released a version of the drug called OxyContin.OxyContin flooded the market, in part because it promised to help prevent addiction and accidental overdose, and in part because Purdue was just really, really good at marketing it; among other questionable and outright illegal things it did as part of that marketing push, it gave kickbacks to doctors who prescribed it, and some doctors did so, a lot, even when patients didn’t need it, or were clearly becoming addicted.By the early 2000s, Purdue, and the Sackler family that owned the company, was spending hundreds of millions of dollars a year to push this drug, and they were making billions a year in sales.Eventually the nature of Purdue’s efforts came to light, there were a bunch of trials and other legal hearings, some investigative journalists exposed Purdue’s foreknowledge of their drug’s flaws, and there was a big government investigation and some major lawsuits that caused the collapse of the company in 2019—though they rebranded in 2021, becoming Knoa Pharma.All of which is interesting because much like the forced legalization of opium on Chinese markets led to their opioid crisis a long time ago, the arrival of this incredibly, artificially popular drug on the US market led to the US’s opioid crisis.The current bogeyman in the world of opioids—and I say current because this is a fast-moving space, with new, increasingly powerful or in some cases just a lot cheaper drugs arriving on the scene all the time—is fentanyl, which is a synthetic opioid that’s about 30-50 times more potent than heroin, and about 100 times as potent as morphine. It has been traditionally used in the treatment of cancer patients and as a sedative, and because of how powerful it is, a very small amount serves to achieve the desired, painkilling effect.But just like other opioids, its administration can lead to addiction, people who use it can become dependent and need more and more of it to get the same effects, and people who have too much of it can experience adverse effects, including, eventually, death.This drug has been in use since the 1960s, but illicit use of fentanyl began back in the mid-1970s, initially as its own thing, but eventually to be mixed in with other drugs, like heroin, especially low-quality versions of those drugs, because a very small amount of fentanyl can have an incredibly large and potent effect, making those other drugs seem higher quality than they are.That utility is also this drug’s major issue, though: it’s so potent that a small amount of it can kill, and even people with high opioid tolerances can see those tolerances pushed up and up and up until they eventually take a too-large, killing dose.There have been numerous efforts to control the flow of fentanyl into the US, and beginning in the mid-20-teens, there were high-profile seizures of the illicitly produced stuff around the country. As of mid-2025, China seems to be the primary source of most illicit fentanyl around the world, the drug precursor produced in China, shipped to Mexico where it’s finalized and made ready for market, and then smuggled into the US.There have been efforts to shut down this supply chain, including recent tariffs put on Chinese goods, ostensibly, in part at least, to get China to handle those precursor suppliers.Even if that effort eventually bears fruit, though, India seems to have recently become an alternative source of those precursors for Mexican drug cartels, and for several years they’ve been creating new markets for their output in other countries, like Nigeria, Indonesia, and the Netherlands, as well.Amidst all that, a new synthetic drug, which is 40-times as potent as fentanyl, is starting to arrive in the US, Europe, and Australia, and has already been blamed for thousands of deaths—and it’s thought that that number might be a significant undercount, because of how difficult it can be to attribute cause with these sorts of drugs.Nitazenes were originally synthesized back in the 1950s in Austria, and they were never sold as painkillers because they were known, from the get-go, to be too addictive, and to have a bad tradeoff ratio: a little bit of benefit, but a high likelihood of respiratory depression, which is a common cause of death for opioid addicts, or those who accidentally overdose on an opioid.One nitazene, called isotonitazene, first showed up on US drug enforcement agency radars back in 2019, when a shipment was intercepted in the Midwest. Other agencies noted the same across the US and Europe in subsequent years, and this class of drugs has now become widespread in these areas, and in Australia.It’s thought that nitazenes might be seeing a surge in popularity with illicit drugmakers because their potency can be amped up so far, way, way higher than even fentanyl, and because their effects are similar in many ways to heroin.They can also use them they way they use fentanyl, a tiny bit blended into lower-quality versions of other drugs, like cocaine, which can save money while also getting their customers, who may not know what they’re buying, hooked, faster. For context, a fifth of a grain of nitazene salt can be enough to kill a person, so it doesn’t take much, less than that, if they want to keep their customers alive, to achieve the high they’re looking for. A little bit goes a long, long way.This class of drugs is also difficult to detect, which might be part of the appeal for drug makers, right now. Tests that detect morphine, heroin, and fentanyl do not detect natazines, and the precursors for this type of drug, and the drugs themselves, are less likely to be closely watched, or even legally controlled at the levels of more popular opioids, which is also likely appealing to groups looking to get around existing clampdown efforts.Right now, drug agencies are in the process of updating their enforcement and detection infrastructure, and word is slowly getting out about nitazenes and the risk they potentially pose. But it took years for sluggish government agencies to start working on the issue of fentanyl, which still hasn’t been handled, so it’s anyone’s guess as to when and if the influx of nitazenes will be addressed on scale.Show Noteshttps://www.wired.com/story/a-new-type-of-opioid-is-killing-people-in-the-us-europe-and-australia/https://link.springer.com/article/10.1007/BF02161116https://www.thelancet.com/journals/lanpub/article/PIIS2468-2667(24)00024-0/fulltexthttps://www.theguardian.com/society/2025/nov/03/nitazenes-synthetic-opioid-drug-500-times-stronger-than-heroin-fatalhttps://www.nature.com/articles/d41586-025-03280-5https://theconversation.com/10-times-stronger-than-fentanyl-nitazenes-are-the-latest-deadly-development-in-the-synthetic-opioid-crisis-265882https://www.cato.org/blog/fentanyl-nitazenes-why-drug-war-keeps-making-danger-worsehttps://www.cfr.org/backgrounder/fentanyl-and-us-opioid-epidemichttps://en.wikipedia.org/wiki/Purdue_Pharmahttps://en.wikipedia.org/wiki/Oxycodonehttps://en.wikipedia.org/wiki/Fentanylhttps://en.wikipedia.org/wiki/Nitazeneshttps://en.wikipedia.org/wiki/Opioidhttps://en.wikipedia.org/wiki/Timeline_of_the_opioid_epidemichttps://en.wikipedia.org/wiki/Opioid_epidemic This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit letsknowthings.substack.com/subscribe

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• Supersonic Flight

  This week we talk about Mach 1, the Bell X-1, and the Concorde.We also discuss the X-59, the Tu-144, and Boom Supersonic.Recommended Book: Red Team Blues by Cory DoctorowTranscriptThe term “supersonic,” when applied to speed, refers to something moving faster than the speed of sound—a speed that is shorthanded as Mach 1.The precise Mach 1 speed of sound will be different depending on the nature of the medium through which an object is traveling. So if you’re moving at sea level versus up high in the air, in the stratosphere, the speed of sound will be different. Likewise if you’re moving through moist air versus dry air, or moving through water versus moving through syrup, different speed of sound, different Mach 1.In general, though, to give a basic sense of how fast we’re talking here, if an object is moving at sea level through dry air at a temperature of 20 degrees celsius, which is 68 degrees fahrenheit, Mach 1 is about 768 miles per hour, which is about 1,126 feet per second, and 343.2 meters per second.It’s fast! It’s very fast. Again, this is the speed at which sound moves. So if you surpass the speed of sound, if you go supersonic, you will arrive faster than the sound you make while moving.Back in 1947, an experimental American plane called the Bell X-1 broke the sound barrier, surpassed Mach 1, reaching a speed of almost 1,000 miles per hour using a 6,000 pound thrust rocket propulsion system. A later version of the same rocket-powered plane, the Bell X-1A, which was basically the same vehicle, it just had more fuel capacity, allowing the rocket to burn longer, achieved 1,600 miles per hour in 1956.Prior to that, in 1943, British began working on a secret experimental aircraft called the Miles M.52, intending to build a plane capable of traveling 1,000 mph. Interestingly, this project was apparently the result of the British wanting to keep up with a supposed already existing German aircraft capable of achieving that speed, though it’s now believed the intelligence that led the British to believe the Germans had a supersonic-capable plane was the result of a mistranslation—the Germans hit 1,000 km per hour, which is about 621 mph, and still subsonic.Though apparently a success in terms of research and innovation, the Miles M.52 project was cancelled in 1946, due partly to budgetary concerns, and partly because the new government didn’t believe supersonic aircraft were practical, or maybe even feasible.After the existence of this project was revealed to the public, however, criticism for the cancellation mounted, and the design was translated into new, unmanned scale-model experimental versions of the plane which achieved controlled Mach 1.38 supersonic speeds, and both the design and research from this program was shared with the American company, Bell, and all that knowledge informed the development of the aforementioned Bell X-1 supersonic plane.Again, that successful Bell mission was flown in 1947, and in 1961, a Douglas jetliner, a commercial jet, broke the sound barrier during a controlled test dive, and that fed the development of an intended supersonic airliner in the US, though similar research being conducted elsewhere would bear more direct and immediate fruit.In the Soviet Union, a supersonic jetliner called the Tupolev Tu-144 entered service in 1968, and a jetliner co-developed by the British and French, the Concorde, began construction in 1965, and tallied its first flight in March of 1969.The Tu-144 was thus the world’s first commercial supersonic airliner, by a few months, and it also became the first commercial transport to exceed Mach 2, twice the speed of sound, in 1970.The Tu-144 was plagued by reliability issues from the get-go, however, and while performing maneuvers at an air show in Paris in 1973, it disintegrated in midair, which—combined with its high operating costs reduced its long-term market viability, especially internationally. By the mid-1970s, it was primarily operating within the Soviet Union, and after a new variant of the jet crashed in 1978, the Tu-144 program was cancelled in 1983. Existing models continued to be use for niche purposes, like training space program pilots, and for a supersonic research program undertaken by NASA in the late-1990s, but the final Tu-144 flight was in mid-1999, and all surviving aircraft are now on display or in storage.The Concorde has a similar history. Original forecasts for the supersonic airliner market were optimistic, and while the craft seemed to be generally more reliable and less issue-prone than the Tu-144, and it enjoyed a period of fanfare and promotion, as a sort of luxury experience for folks crossing the Atlantic in particular, cutting travel times in half, a major crash in mid-2000, which killed all 109 occupants and four people on the ground, led to the suspension of service until late-2001, and all remaining Concorde aircraft were retired in 2003—about 20 of them are on display throughout North American and Europe, as of the mid-2020s.The costs associated with operating Concorde aircraft, as with the Tu-144, were also quite high, and those costs and other complications led to the cancellation of a would-be supersonic jetliner competitor from Boeing, the 2707, in 1971, before it built any prototypes.What I’d like to talk about today is a renewed enthusiasm for supersonic passenger aircraft, and what’s changed that might make supersonic transport a viable market, today.—In the United States, commercial aircraft are not allowed to fly at supersonic speeds. This is because the sonic booms generated by supersonic flight, which are shockwaves that work a bit like the crack of a bullwhip or the firing of a bullet, but much, much larger, can set off alarms, rattle or shatter windows, and generally create all sorts of chaos on the ground, even in areas not directly under the aircraft that’s breaking the sound barrier.This was true even during the heyday of the Concorde: the craft was only allowed to travel at supersonic speeds over the ocean, because doing so over populated areas was such a pain, and in some cases, a danger.Sonic booms aren’t the only reason supersonic aircraft like the Concorde failed to establish a long-term presence in the airline industry, but they’re a big part of it. It’s just really difficult to work around that kind of persistent issue.This is why a new experimental project by NASA, the X-59 Quesst, with two-s’s, Quesst standing for Quiet SuperSonic Technology, is garnering so much attention. Built by Lockheed Martin, the X-59 is said to dramatically reduce the scale of sonic booms, instead producing what’s been described as a sonic thump, its long, slender nose breaking up the pressure waves that otherwise build up and create that much larger, more impactful shock wave boom, and its engine is on top of the plane rather than underneath it, a design choice that sends the majority of remaining shock wave impacts upward toward the sky, rather than down toward the ground.The X-59 is still just an experimental jet. It’s a single-seater, it’s about twice as long as an F-16 fighter jet, and it can cruise at around 925 miles per hours, which is Mach 1.4.It’s hoped that this new design will allow for the creation of future supersonic jetliners, though, as being able to traverse oceans twice as fast would bring massive economic benefits, in terms of shipping people, but also all kinds of goods. Being able to use these aircraft fully, at their full speed, over land and to and from any airport, would likewise make them more versatile and introduce new benefits and, hopefully, favorable economics.Worth noting here is that this jet is a descendent of that first Bell X-1 plane that broke the sound barrier in 1947; NASA’s X-planes are innovative models meant to push the boundaries of what’s currently possible, and the X-59 is just a more modern version of that initial X-1 conception in many ways.That said, the X-59 has only been successfully flown at low speeds and altitudes at this point. It got a lot of press at the end of October 2025 for successfully completing its first flight, which shows it can fly and land, which is good. But its inaugural flight stuck with a low altitude and just 240 miles per hour; really slow for a jet, and too low for a commercial airliner.The folks behind this project have also said that while they have every reason to believe this design will both work and create a far less impactful sonic boom, they don’t yet know if that boom will actually be tolerable for people on the ground. Simulating such things is different from the experience of them, and they won’t know until they power the thing all the way up and have it break the sound barrier whether the sonic thump will be barely noticeable and tolerable for folks near airports and flight paths, or if it will be better, but still not good enough to make this a viable alternative to existing jets.There are other entities working on similar things right now, including a company called Boom Supersonic that has already flown a piloted demonstration aircraft, the XB-1, at supersonic speeds—Mac 1.122, which is about 750 mph—at an altitude of over 35,000 feet; the first time a non-government-affiliated aircraft has done so.That was back in March of 2024, and the company plans to build a commercial supersonic aircraft that will carry between 64 and 80 passengers at Mach 1.7, on hundreds of global routes; they say they already have a large number of orders for this passenger aircraft they intend to build, and they say to begin with, they’ll be able to produce 66 of them per year from their factory in North Carolina. They say that they’ll have the first full-scale prototype of that passenger aircraft, called the Overture, in 2027, and they’re aiming to put that craft into service beginning in 2029 or 2030.They’re not the only private company aiming to produce supersonic aircraft for various purposes, either. The promise of moving people and things around the world, faster than most of today’s options can manage, and in many cases far faster, is still tantalizing for many industries, so long as regulatory, safety, and technological hurdles can be traversed. For most of these private companies, their innovation seems to be mostly in price and scale, not reducing the boom, but some have also claimed that their sonic booms are more moderated; there’s also a good chance findings from the NASA X project will translate over to the commercial world in due time, if these companies survive, blending those innovations.It’s an interesting moment in this space, then, in part because it seems like supersonic flight is appealing again, to some, at least, after a long period of dashed hopes—that dashing partly the consequence of flaws in earlier models, and headline-grabbing crashes that ruined a lot of appetites for the option.But also because we could see modern technologies, from sensors to propulsion systems to manufacturing capacities applied to this vehicle type, which could ease a lot of the issues that made the Concordes and Tu-144s non-workable the first time around, and could make this type of transport and travel cheaper, too, though probably not until mid-century at the earliest, according to current timelines.Show Noteshttps://arstechnica.com/space/2025/10/nasa-test-flight-seeks-to-help-bring-commercial-supersonic-travel-back/https://en.wikipedia.org/wiki/Sonic_boomhttps://www.wired.com/story/nasas-quiet-supersonic-jet-takes-flight/https://www.sofeminine.co.uk/back-in-4-years-your-london-new-york-time-slashed-by-3-hours-as-60-80-seat-supersonic-jet-nears/https://abcnews.go.com/US/wireStory/nasa-takes-step-closer-launching-quiet-supersonic-jets-127036299https://boomsupersonic.com/https://www.grc.nasa.gov/www/k-12/airplane/lowsup.htmlhttps://www.nasa.gov/aeronautics/supersonic-flight/https://www.spikeaerospace.com/https://en.wikipedia.org/wiki/Miles_M.52https://en.wikipedia.org/wiki/Bell_X-1https://en.wikipedia.org/wiki/Supersonic_aircrafthttps://en.wikipedia.org/wiki/Tupolev_Tu-144https://en.wikipedia.org/wiki/Concordehttps://en.wikipedia.org/wiki/Supersonic_transporthttps://en.wikipedia.org/wiki/Supersonic_speed This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit letsknowthings.substack.com/subscribe

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