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Where electricity comes from in each country in the world, told on an essential map

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To stop climate change, it is essential to “clean” electricity, that is, decarbonize it to reduce global carbon dioxide emissions. The reason is clear: the electricity sector is to blame for approximately a third of global emissions, according to IEA data for 2025. What this world map does is shed light on the origin of the light that reaches us when we press the plug because knowing where the electricity comes from in each country is the first step to knowing what needs to be changed and how long it takes to achieve it. This map of Our World in Data sample for each state what is the main source of electrical energy for the period 2024/25. Behind this data visualization initiative is the University of Oxford and for its preparation uses information from Global Electricity Review Ember. There are 215 countries in their database, although for this representation they use 91 states that represent 93% of global electricity demand. Viewing and understanding the map is simple: one color for each dominant technology: orange is gas, gray is coal, blue is water, purple is nuclear, yellow is solar. In addition, it offers the percentage of that dominant technology to know how much this source represents in the state total. This point is important because a state can be colored orange because gas accounts for 40% of the total even though it has 35% renewables in total. It is a map of the present, not of how we want it to be or where the trend is going. The first thing we see on the map is that andCoal remains the largest single source of electricity generation in the world, a ranking that has been leading for more than half a century and that in this visualization represents 35% of the global generation. Of course, it is the lowest percentage since the founding of the IEA in 1974. One of the reasons why the global electricity sector continues to have so much weight in emissions is precisely because of the leadership of coal. Another reason is gas. In fact, in 2024 fossil fuels still generated almost 60% of the world’s electricity. Broadly speaking, the map shows how gas is hegemonic in rich countries in the northern hemisphere while coal dominates in Asia. In South America and parts of Africa, hydroelectricity is historically what makes the difference. However, Europe is a true rainbow, the result of decades of political strategies and investments. In fact, the big green shoot for the decarbonization of electricity goes through renewable energieswhich in 2025 surpassed coal for the first time in history: solar, wind, hydroelectric and others together produced more than a third of the world’s electricity. The good news is that almost all of the increase in electricity demand in 2024 was covered by clean sources. But there is one that shines with its own light: solar energy, which in 2024 surpassed wind power for the first time globally. Two states that are true powerhouses in solar generation are Spain with 22% and Chile with 25%. What is the main source of electricity for the countries of the world. Our World in Data What the map doesn’t say Our World in data map has small print: While it is true that renewables have grown, so have coal and gas. Thus, in 2024, developing Asian countries they consumed 80% of all the coal used for electricity in the world, when in 2000 it accounted for 40%. And there is a problem that the map leaves out: there are hundreds of millions of people who They do not have access to electricity. More specifically, 730 million in 2024. Of all of them, Africa concentrates 80%. These countries will have to build their network from scratch and the million-dollar question will be whether they will have the financing to do it with renewables or will they rely on the classic fossils, which are cheaper and more readily available. Another important fact that this world map omits is where does the fuel come from. That is, a country colored orange may depend on a neighbor with whom it has a strained relationship. Without going any further, in 2021 45% of imported gas by the EU came from Russia. When war broke out between Ukraine and Russia, that dependency made electricity more expensive overnight. Europe reacted, but at what price: now imported LNG it is more expensive. It is not the only one: Southeast Asia too suffers from energy dependence of the coal that matters. In Xataka | How much electricity each country on the map produces with renewable energy, displayed on a graph In Xataka | The most fascinating map you will see today: the entire electrical infrastructure of the planet, in an interactive infographic Cover | Our World in data

The European Commission wants to sweep Huawei off the map. Spain has told him not so quickly

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The European Commission lhas been trying to expel Huawei for years of their telecommunications networks. And that intention wants to become a binding law, one that would exclude all Chinese teams within a period of 36 months. But there are two countries acting as a retaining wall: Spain and Germany. what’s happening. The European Commission wants to veto Huawei and ZTE citing security reasons. Through a review of the Cybersecurity Regulation, it proposes mandatory elimination of high-risk suppliers. The current draft establishes the mandatory recall of equipment provided by “high-risk suppliers”, assuming a formal veto for Chinese telecommunications companies. The Spain case. In Spain we have a problem with this intention. Telefónica renewed its 5G core contract with Huawei in 2024 and valid until 2030. As relevant information, this 5G core was renewed with the Chinese manufacturer for private equipment, but the contracts for government institutions and business services were awarded to Nokia. In other words, the most sensitive infrastructure is already in European hands. Vodafone –now controlled by Zegona–, maintains the majority of its network with Huawei technology, and although MásOrange has been reducing the presence of the Chinese brand in its equipment for some time (less than 40% in 2027). In short, Large Spanish operators have been using Huawei equipment for years despite the EU’s warnings, and they do not seem willing to simply sweep it off the map. The German case. Something similar happens in Germany. Huawei is still present in more than 60% of the country’s antennas, and although progressive withdrawal plans are already underway, the schedule imposed by Brussels does not seem realistic. Fighting tooth and nail. Both countries have warned the Commission of their concerns in this regard: vetoing China from the European network infrastructure may provoke retaliation, in addition to making the deployment of the network significantly more expensive.to artificial intelligence infrastructure which Europe has been dreaming of for a year and a half. The EU Council requires a majority to approve this plan, so Spain and Germany can look for allies to try to stop it. This would allow the process to be delayed, require modifications and exceptions in the draft, or even end the proposal if it fails to move forward. The possible outcome. With such fierce opposition, the most likely outcome is that there will be no victory for anyone. Spain and Germany may knock down the proposal completely, but they do have enough muscle to deform it. It seems inevitable that, sooner or later, Huawei will disappear from European telecommunications, but the deadlines will not be as immediate as Europe intends, nor is it ruled out that there will be specific exceptions if countries demand it. In Xataka | I tested four Huawei devices at once to evaluate their ecosystem: great hardware, lacks glue

With the Find X9 Ultra, OPPO has an ambitious plan to conquer the heart of Spain. And its CEO has told us what it is

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From the offices of OPPO In Madrid, at the top of a building very close to Plaza de Castilla, you can see an old water tank from the Canal de Isabel II. It is a huge concrete structure inaugurated in the middle of the last century that today, no longer in use, functions as one of the visual “landmarks” of the square. It is very big, about 40 meters high, but it is very far away. I take one of the OPPO Find X9 Ultra that’s on the table, I open the camera, zoom in 10x and take a photo. The result is impressive. The camera returns an image full of details: the contours of the concrete, already worn, the advertising signage that floods its dome, the brutalist curves that the tower draws. All this from inside an office and interrupted by a large window. I look towards the back of the room, where there are some boxes of snacks and pastries ready for breakfast. There are tiny inscriptions on the side, so I repeat the process: I open the camera, zoom in 10x and take another photo. The sharpness is extraordinary. There is no pixelation or noticeable distortion or digital zoom artifacts in the drawing of the letters, nor a great chromatic distortion with respect to what my eyes see. “What we want to do with the Ultra is not just another incremental improvement, we want it to be an alternative to your professional camera,” he explains to me. Kevin ChoCEO of OPPO in Spain since last summer. “It would be like buying a camera with a built-in phone and not the other way around, right?” I ask him. “That is, camera firstmore than a phone with an interesting camera.” Looking at the wide range of tools on the table, it’s hard not to agree. The launch of the Find X9 Ultra in Spain marks a milestone for OPPO: for the first time, the company launches its top-of-the-range phone in Europe, something reserved until now for Chinese consumers. OPPO has not spared any details: the Ultra incorporates an ambitious 300 mm teleconverter equivalent in 35 mm and 13x format that is attached to the phone’s gigantic lenses to multiply the camera’s possibilities. Why has OPPO made such a determined bet for photographyWithout a doubt the most notable aspect of a Find X9 Ultra full of attractive features and specifications? “There is a very marked polarization in the market,” explains Cho. “Around 30% or 40% of buyers continue to opt for devices under 200 euros, or even second-hand, but what we are also seeing is an expansion of the premium segments. It is the same trend month after month: premium sales are growing.” (Xataka) Cho introduces a key word: “premiumization.” The market polarization of the mobile phone is neither new nor surprising for anyone who has paid attention to the dynamics of recent years. Many consumers tend to hold on to their devices for longer, as a result of the large investments they must make, which is why they demand more performance and quality from their products. This gap, also present in markets such as the car, has forced almost all brands to recalibrate their strategies. OPPO’s ambitious plan “We don’t want transactional volumes,” Cho continues, “you know, competing on price. We want to make sure we bring products that can create value for the consumer.” According to Cho, OPPO is facing its second wave of expansion in the European market: after a consolidation of the brand and sales in recent years, it is time to grow not so much through raw numbers as through loyalty in the segments. more exclusive of the market. And for that you need a product up to the task, hence the arrival of the Find X9 Ultra. A landing that, however, has required adaptations. Since his arrival in Spain, Cho has promoted a change in OPPO’s methodology, especially regarding the consumer: “We are doing studies to understand consumer preferences and to define our strategies.” Refers to focus group and surveys with more than 4,000 respondents, a very large sample that exceeds those that the brand was doing until then. Cho is clear that the only way to compete in the premium segment is by going to the user, or, in his words, “winning the heart and brain of the consumer.” (Xataka) The approach is ambitious, as are its objectives. When I ask him where he would like to see OPPO in five years in Spain, he answers without much hesitation: “As the number one brand.” The Find X9 Ultra is the first stone of a long road ahead, a way to “test the roof” of OPPO in Europe. His first steps have consisted of relearning and readapting the lessons of the chinese marketwhere OPPO is a brand with a lot of penetration and experience in the premium segments, for Spain and Europe. Before the launch on the old continent, OPPO has had to make some adjustments in terms of operating system and memory to adapt them to local needs and preferences. Given the constraints of such a competitive segment Like the premium one, OPPO has two other arguments to win over the consumer: its operating system, ColorOS, and the battery. Cho boasts leadership in the second area and widespread user satisfaction in the first: “In China, our operating system has consistently been our main selling point for the past three years.” In Spain, the Ultra works on Android, like the rest of the market, but Cho highlights the interoperability and customization of OPPO: “We have been working on inter-device and inter-ecosystem interoperability for some time, so that you can use the phone with a Windows computer or a Mac.” (Xataka) Camera, battery, operating system… The elephant in the room that needs to be addressed is AI. Is there the definitive angle for a mobile phone brand to be more attractive than its competition? Cho’s answer is not direct but clear: OPPO’s strength is … Read more

When they told us all the advantages of intermittent fasting, they forgot one small detail: that it could make us bald.

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For years we have been sold that intermittent fasting It was the strategy of the future to lose weight and improve our metabolic health. It is logical: it was something easy to implement, reasonable and very striking. Had everything necessary to become a fashion. And so it was. It is now, as the first long-term studies come to an end, that we begin to really understand its pros and cons. The most striking, of course, is the one that has to do with hair. What exactly is intermittent fasting? In general terms, we call ‘intermittent fasting’ a diet that alternates periods without food restrictions with brief periods of fasting. ‘Fasting’, here, is a deliberately elastic term: it can mean eating absolutely nothing or significantly reducing the number of calories consumed. The idea behind it sounds good.. When we undergo prolonged calorie restriction, the body goes into “savings mode” and that causes weight loss to slow down (or, at least, slow down). Intermittent fasting would attempt to trick the body into not adapting to the new calorie restriction and therefore continuing to “spend” at a normal rate. And does it work? That’s the bad news. “Research does not consistently show that intermittent fasting is superior to continuous low-calorie diets” when it comes to weight loss, the study tells us. more complete analysis on the subject after reviewing almost fifty studies. The clinical trials that have been carried out Subsequently, they only insist on the same thing: in general terms, the results are identical to those with the rest of the normal diets. Both in the dropout rate and in the amount of weight achieved or the improvement in health markers. The choice of another method, ultimately, has more to do with individual philias and phobias than with any type of extra scientific evidence. After all, everyone has a peculiar relationship with food and, consequently, there are some strategies that ‘fit’ us better than others. In other words, there are people who use it. Yes and the truth is that nothing happens. Little by little, researchers are discovering good things (can help intestinal cells regenerate) and bad things (could promote the formation of precancerous polyps). So, little by little, we are better understanding what it does, what it stops doing and what mechanisms are behind intermittent fasting. That’s when the surprises begin. Because, for example, a clinical trial carried out with mice has discovered that intermittent fasting slows hair growth. Researchers at Westlake University (in Zhejiang, China) took about 50 mice, shaved them and divided them into three groups with dietary restrictions (fed every 8, 16 or 48 hours) and one without restrictions which is the control group. After a month, the mice that could eat without problem had recovered their hair. Those who fasted, on the other hand, only partially recovered after 96 days. As? Because? What is happening here? The first thing is to make it clear that the researchers “They don’t want to scare people away from intermittent fasting.“; but rather highlight “the importance of taking into account that it could have some unwanted effects.” Taking this into account (and that the study is in mice), the answer is both simple and full of uncertainties: to begin with, hair growth is a process that requires constant and balanced nutrition. But researchers believe the problem could go further: It is possible that “the body uses fat reserves instead of glucose and this could trigger the release of chemicals that damage hair cells.” However (and this is important) the research is in a very seminal state and there is still much to investigate. After all, there is no better occasion than this: the occasion they paint her bald. Image | Seika In Xataka | The great promise of science to end baldness is not a transplant or a medicine: it is a vaccine A version of this topic was originally published in February 2025

Einstein told us how to do it, engineering tells us it’s almost impossible

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After the success of Artemis IIscience already has its sights set on the colonization of the Moon or Mars. The problem is that, for this to be possible, it would be necessary to develop technologies that do not exist today. For example, you can spend a short time under the effect of microgravity, but if someone wanted to spend very long stays in space, much longer than those of the International Space Station, they would need artificial gravity generation systems. If not, your health could seriously deteriorate. And how is that gravity generated? Theoretically we know it, the problem is getting it. Einstein gave the first clues. In his Theory of Special RelativityEinstein described something known as the equivalence effect, which stated that gravity and acceleration are indistinguishable effects when they have the same value. That is, since the force of gravity on Earth is 9.8 N, equivalent to an acceleration of 9.8 meters per second squared, if an astronaut traveled in a spacecraft that ascends with an acceleration of 9.8 m/s², he would feel his feet clinging to the ground, even without gravity. For this reason, all theoretical projects to create artificial gravity are based on this principle. Too much fuel. One option would be the example we have seen. A rocket accelerating at 9.8 m/s². The problem is that to maintain this figure constantly unfeasible amounts of fuel would be needed. It is not something feasible. Better spinning. Given the technical impossibility of the first option, all projects aim at centripetal acceleration. That is, the acceleration that a rotating body maintains. If we were inside a ship that rotates with a centripetal acceleration of 9.8 m/s², we could imitate gravity. But there is a problem. Centripetal acceleration is equal to angular velocity squared times the radius of the spin path. As if it were the spoke of a bicycle wheel. Angular velocity is the speed at which that object rotates. If the radius is small, a very high speed is needed to achieve a given acceleration. And of course, the people inside that circular ship would end up very dizzy. On the other hand, in very large ships it would not be necessary to turn so quickly. Therefore, for a small ship it would not be viable, but perhaps something like this could be achieved if a new space station is built in the future. In fact, There is a project to build a luxury hotel in the space that would be shaped like a giant wheel. It would be constantly spinning, with the exact radius and speed to mimic the effect of gravity. Doesn’t anyone think about the Moon? The objective of lunar bases is that their inhabitants can be directly perched on the selenite surface. The same would happen with the Martian bases.. They would have to be on the surface. Therefore, it would not be viable to be inside a flying wheel. On the other hand, a wheel could be built to which the lunar colonizers would go from time to time. Just enough to reverse to a certain extent the harmful effects of microgravity. It would be like a kind of microgravity spa. This is something that a team of scientists from Kyoto University has already designed. They have named it The Glass. The consequences can be very serious. When we are not subjected to gravity, body fluids can travel to the headcausing brain inflammation and vision problems. This also affects the circulatory system, as it can increase pressure in specific vessels, such as the jugular vein. Even the heartbeat would be affected. On the other hand, by not needing to be in a rigid posture, the muscles gradually atrophy and the bones lose density. All this without counting possible neurological, balance or intestinal problems. Long stays in a microgravity situation are unfeasible, so it will be necessary to have a clear project to develop artificial gravity. If we want to live in space, we will really need it. Image | Orbital Assembly Corporation and Kyoto University In Xataka | We knew that Mars has gravity. Now we have just discovered the unexpected effect it has on the Earth’s climate

For decades we have been told that seafood does not feel pain when boiled. We were seriously wrong

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An action that can be quite common in the world of gastronomy and cooking in general is that of literally boil the lobsters and the crabs while they are alive. Something that was quite accepted, since it was thought that these animals were not aware that they were being boiled and did not even feel pain. But this is changing radically, although it does not transfer to kitchens. What we knew. This idea that the animals did not suffer any type of pain is something that could be doubted (a lot), since when you put them in a pot of boiling water they begin to have great shakes. But this is something that was pointed out as a mere reflex, but that did not have any type of awareness of the pain. A new study. A team from the University of Gothenburg has pointed out that this is not the caseand they have done so by focusing on Norwegian crayfish or lobsters. And to demonstrate that this is so, they have simply given him analgesics that humans take, such as aspirin (although it is no longer as prevalent due to its analgesia) and even local anesthetics such as lidocaine that is used in humans, for example, when they are going to give stitches to a wound. In this way, once the lobsters were anesthetized, they were placed in boiling water again and their movements, which were supposedly a reflex, were seen to be drastically reduced. What does it mean? Here logic tells us that if the animal’s behavior were a simple reaction due to the stimulation of a nerve, an analgesic should not affect it and would have to be generated in the same way. But the fact that drugs that block our own pain also work in crayfish suggests that there is more than a simple reflection when it comes to putting them in the boiling water, but they are really suffering. The ethical problem. The fact that it was thought that a crustacean with these characteristics could not be aware of pain was based on the fact that they have a very simple nervous system, so boiling them alive had no influence on animal well-being. But now researchers call for reflection and reopen the debate about whether we really should continue recommending this type of practices within the culinary world. This is not the first time this has been seen, since other studies analyzed the crabs through electric shocks given to them when they passed through a specific area. In this way, the crabs learned that they should not go through the area that gave them an electric shock, demonstrating that they did have awareness of this unpleasant experience and also memory. Now, with evidence of response to painkillers, the lobster’s “insensitivity” argument appears to have its days numbered. The legislation. Today, in many countries it is not considered that these practices are prohibited, as it is punishable, for example, to physically harm a dog or a cat. But the truth is that in some countries they are trying to adapt to the new reality, such as the United Kingdom, which recognizes lobsters, crabs and octopuses as sentient beings. Besides, in New Zealand This includes a requirement that animals going through the pot be declared desensitized through techniques such as extreme cooling or electrical stunning, to prevent them from being alive and conscious before being cooked. But the problem is that in much of the world it is still completely legal to cook them alive. Images | Monika Borys In Xataka | Batch cooking is taking off for a very simple reason: if you want to eat well, you can’t trust yourself.

To rescue the pilot lost in Iran, the US has told a story worthy of Spielberg. Some explosive images tell a very different story

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In military manuals, rescue missions in enemy territory are as rare as they are dangerous: In decades of modern conflicts, only a few have been successfully completed without becoming a complete disaster. Some have marked history for their failuresothers for their execution to the limit, but most share something in common: the margin of error It is practically non-existent. Two stories for the same mission. When explaining the rescue mission of an American pilot on Iranian territory, Washington has told a story that Spielberg himself would sign: a wounded airman, alone and hiding in a mountain crevice, resisting for almost two days while the enemy searches for him and an elite force that bursts in between explosions to get him out alive. Of course, there is another version that is not narrated by American communiqués, but by some explosive images launched from the Iranian side: destroyed aircraft, improvisation on the ground and an operation that, although successful in its end, seems much more chaotic than what was intended to be conveyed. Between the two, a story full of chiaroscuros is built where epic and uncertainty coexist. The demolition and the race against time. lThe story started several days ago with the downing of an F-15E in Iranian territory, an already exceptional fact as it was the first American fighter lost in combat in years. The two crew members eject, but only the pilot is quickly rescued, while the weapons systems officer is isolated in a hostile mountainous area. From there a race against time: The wounded airman climbs a ridge, hides in a crevice and emits intermittent signals so as not to give away their position, while Iranian forces, militias and even civilians motivated by rewards search the area. For hours, not even Washington is clear if he is still alive. The perfect official version. The American narrative presents the mission as an impeccable display of power and coordination, with special forces, bombers, drones and massive air cover executing one of the most complex rescue operations in its history. There is talk of surgical precision, absolute control of airspace and clean extraction no American casualtiesculminated with a triumphalist message that elevates the operation to a symbol of military superiority. The CIA involvement adds an almost cinematic component, with an apparent deception campaign that confuses the Iranian forces as they locate the pilot “like a needle in a haystack.” A US Army AH-6 Little Bird helicopter The “other” details. However, upon delving into all the data that has been appearing, important cracks appear in the story. The first rescue attempt fails under enemy fireseveral helicopters are damaged and at least one A-10 falls during the operation, which already calls into question the idea of ​​total control. It happens that the final extraction is not goes as planned. How much? Apparently, two special operations planes were trapped on the ground after their wheels sank on a makeshift runway, forcing emergency reinforcements to be sent and, attention, to destroy them later to prevent them from falling into Iranian hands. The images of the place They show charred remains of aircraft and helicopters, evidencing a much more eventful and risky operation than the official story suggests. The ambiguity of combat. Because another key point is the nature of the confrontation. While some versions speak of a “mass shooting”other more detailed sources indicate that there was no direct combat sustained on the ground, but rather air strikes against approaching Iranian forces. This difference is neither trivial nor minor, because it actually transforms a narrative of heroic confrontation in a very different where technological and aerial superiority was the truly decisive factor, reducing the drama of hand-to-hand combat, but increasing the feeling of distance between what was told and what happened. Propaganda, perception and war of stories. If you like, everything indicates that the rescue was not only a simple military operation, but a narrative battle in the middle of war. From the sidewalk in Washington, the story became a kind of “Easter miracle” useful for bolstering domestic support and projecting strength. However, from the sidewalk of Tehran, the simple fact of having shot down the plane It already served as proof that he could challenge the United States. In that context, every detail counts the same that every omissionbecause control of the story is almost as important as the tactical result. Success with many shadows. The pilot seems to have been finally rescued and that, in military terms, marks the success of the operation. However, the path to achieve it reveals something more complex: a mission on the edge, with failures, improvisation, extreme risks and decisions made on the fly that contradict the image of perfect execution. Perhaps for this reason, between the story that seems written for the cinema and the one revealed by the smoking remains on the ground, it remains a conclusion most uncomfortable: even the most successful operations can hide a reality much more fragile than one wants to admit. Image | US MARINE In Xataka | The US is going to end its war in the Middle East with a very uncomfortable reality: Iran had years of advantage underground In Xataka | If the question is “how close are we to an escalation in Iran,” the answer is US A-10s flying there

Tired of being told that philosophy was just opinions, one guy set about collecting all the “philosophical facts” he could find. He got 200

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Philosophy has a reputation for discussing everything and the truth is that it is a reputation that has been hard-earned. However, it is not a matter of saying the first thing that comes to mind. It’s not even a matter of opinions, no matter how informed they may be. At least, that is the opinion of philosopher Bryan Frances. In fact, Frances is convinced that, in reality, philosophers only discuss details and minutiae: in substance, they agree on almost everything. But of course, it is not enough to say it: it must be defended. So he began to do something strange for a philosopher: instead of arguing it, he began to compile this enormous core of shared truths. That is, to make a list. But let’s start at the beginning. Frances’s thesis is that, as I say, there is great agreement among philosophers about the truth of many substantive claims. What’s more, he is convinced that, in philosophy, there is progress equivalent to that of any other science. That is, “based on facts.” The thing is that discipline — for better or worse — tends to revolve around the controversial. The curious thing is that he realized that not even the philosophers themselves were aware of this. And what a list… So, neither short nor lazy, he published ‘Philosophy as Fact-Based Discipline: 200 Philosophical Facts, published in Philosophical Studies‘: the list. A list of elementary truths pedagogically comparable to introductory science material. “It’s not the deepest,” but it’s (definitely) something cumulative and useful to understand. But, beyond that, it is also a way of reclaiming the discipline in a climate that repeatedly questions the role of the humanities in the body of knowledge. And what truths are those? Once we have made it clear that it is not about talking about deep truths (Does free will exist? Why being and not nothingness? etc…), the question becomes evident: what are they then? They are simpler things like, for example, what beliefs are (which come in many formats, they can be about almost anything or they can exist even if we are not aware of them), what evidence is (which are not just tests), what biases, emotions or faith are. It’s very interesting review the 200 facts because there are very interesting things about things that one had not asked: does believing in something make it true? Does the evidence have direction? Is suspending the trial a rational thing to do? Thought in action. But beyond the facts themselves, Frances’ idea is intelligent because it points to something singular: there is cognitive progress, an ultimate structure of reality to describe, a philosophical ‘holy grail’ to find. It’s not much, I admit. But the idea that the universe is not the horrible chaos it seems is (in its own way) comforting. Image | Alan Dela Cruz In Xataka | “A place of joy with pain”: the phrase that summarizes the Aztec philosophy to be happier in this life

why the head is not the thermal “chimney” that we have always been told

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When winter approaches, many people cannot go outside without some basic items, such as a jacket, gloves and also a hat. The latter, in addition to being a complement that suits some very well, has also represented a mantra that has been repeated on different occasions: heat ‘escapes’ largely through the head. There are nuances. This is something that is accompanied by stratospheric figures, such as between 40 and 50% of our body heat ‘escapes’ through the skull. But the truth is that science adds nuances to these data so that we can be much calmer, although in the case of newborns we can have an interesting debate. The origin. To understand why half the world believes that the head works like a human chimney, you have to travel to the 1970s. And more specifically to the United States Army Survival Manual. At that time, experiments were carried out with subjects exposed to extreme cold temperatures. The methodological problem, or rather the subsequent interpretation, was that the participants were wearing arctic survival suits that covered the entire body… except the head. Logically, when measuring the heat loss, the researchers found that most of it escaped through the only area that was bare. And from here arose the need to wear a hat because almost all the heat was released from this part. What is known now. Subsequent studies have been responsible for dismantling this belief. that 40-50% of the heat is released through the skull. The conclusion of science indicates that physical reality is much simpler, since heat loss is proportional to the surface of exposed skin. In this way, if the head of an adult represents approximately 7% of the body surface, it will contribute only to diffuse 7-10% of body heat that is being lost. They have proven it again. In addition to the most classic studies that have been done, science has also wanted to analyze this phenomenon in cold water swimmers. using neoprene suitscomparing when their head is submerged and when it is above the water. Here it was seen that the skull does not dissipate heat disproportionately, but is simply exposed skin with nothing special that indicates that it should be protected more than another part of the body. The cold of the head. Although the percentage of heat lost here is low, there are physiological reasons to protect it. Specifically, the head, and especially the face and scalp, are areas with very little fat or muscle insulation compared to other parts of the body. In addition, they have a large number of blood vessels and thermal receptors on the surface, which makes them much more sensitive to the sensation of cold. This means that, although 50% of the heat is not lost through the skull, cooling the head gives us greater thermal discomfortso by covering it we feel much warmer. In addition, it also acts on cardiovascular reflexes and lowering core temperature. Therefore, wearing a hat in winter is useful, but it works the same as wearing gloves or a good scarf: it is another layer of insulation, not a magic cap. An exception. There is always an exception to every rule, and in this case they are in babies. in a newbornthe head is enormous in proportion to the rest of the body, occupying a much greater percentage of body surface than in an adult. This means that they do lose more heat here than in any other part of the body, and that is why we always see a baby with a hat on almost from the time they are in their first days of life. Science has pointed out Because in full-term newborns, an insulating hat can reduce total heat loss by 75% and oxygen consumption by 85% compared to being naked. In low resource settings or in low weight babies, the use of wool hats is clearly associated with a lower incidence of hypothermia. But with control. In healthy, full-term babies who are in warm rooms, or practicing the skin-to-skin method, the evidence suggests that the hat does not always provide a clear extra benefit and even, if combined with excessive warmth, it can promote overheating. With or without a hat. In conclusionit must be taken into account that the head is not a special part where a large amount of heat is released. However, in everyday life it is usually the only part of the body that we wear naked in winter and it has little natural insulation, so covering it is an efficient strategy to improve thermal comfort. Images | Jonathan J. Castellon In Xataka | The cold is so savage that Ukraine has activated the most kamikaze option: the “50,000 Russians per month” or giving Moscow what it wants

Since we were children we have been told that Jupiter is enormous, colossal, exaggeratedly large. Turns out not so much.

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There are things that we learn in childhood that accompany us throughout our lives and one of them is to recite the Solar System at once, which has its disadvantages: for those of us who are already old, mentioning Pluto (which It is no longer a planet) either make mistakes when estimating distances interplanetary. Another classic misconception is the size of Jupiter. Data from the Juno mission published in Nature Astronomy They change the shape and size of the colossus of the Solar System. Jupiter is flatter and smaller than we thought. We knew that Jupiter was the largest planet in the Solar System, a gaseous colossus whose mass exceeded that of the rest of the planets combined, which gave it the power to be almost the conductor of the orchestra (with the permission of the Sun) as long as its gravity had a lot of weight. Its large magnetic shield protects its moons from solar radiation, it has iconic clouds and storms in astronomy and its Great Red Spot It exceeds the Earth in size. But there is something wrong with its shape and size. The Context. The missions Voyager and Pioneerdating back to the 1970s, established figures that today we read in science books: that Jupiter has an equatorial radius of 71,492 kilometers and a polar radius of 66,854 kilometers. With this model, the planet was assimilated as a sphere flattened at the poles (oblate spheroid). These dimensions were calculated with just six indirect measurements with profiles of radio occultation. The discovery. Because what Juno has seen shows that the equatorial radius is approximately 8 kilometers smaller and the polar radius is about 24 kilometers smaller than previous missions said. Qualitatively, Jupiter is flatter. The first thing that comes to mind is: How important are eight kilometers on a planet 140,000 kilometers wide? Well scientifically, it has it. In fact, it’s the difference between whether the laws of physics fit or not. Why is it important. Well, because although the difference is comparatively minor, the fact that it is smaller and has a flatter shape has thermodynamic implications. Thus, it suggests a colder atmosphere enriched with heavy elements that better suit what the Galileo probe measured in 1995. Additionally, having accurate geometry is essential to understanding what’s inside and interpreting the gravity data provided by Juno, so we can accurately map how its mass is distributed inside and how hydrogen behaves under extreme pressures. On the other hand, knowing Jupiter better is getting closer to the recipe of how the Earth was formed and going beyond: facilitating the understanding of thousands of other exoplanets giants that we are discovering in the stars. Radio occultation operation diagram. MPRennie Wikipedia Juno’s look. Both Pioneer and Voyager and Juno use radio occultation, that is, they use the same physical principle. The radio occultation technique consists of measuring how a planet’s atmosphere bends and slows down the radio signals of a probe when it is hidden behind it. By analyzing the delay and deviation of these waves from the Earth, the scientific team can precisely calculate the density and pressure and therefore the exact shape of the planet. Of course, from a technological point of view there has been half a century of evolution and it is noticeable in terms of quality due to its multiband operation, precision and repetition. Thus, the probes of the 70s mainly used one radio band while Juno uses two, which allows, among other things, to eliminate noise. Likewise, the original ones were passing missions in front of the planned June orbit, that is, we have gone from having six points to an almost complete map. And finally, ground-based tracking systems are night and day when it comes to measuring changes in frequency and signal arrival time. In Xataka | We have been deceived by the distances of the Solar System: the closest neighbor to Neptune is Mercury In Xataka | We knew that there was water on Mars, but not how much. It turns out that 3.37 billion years ago an ocean covered half the planet Cover | NASA Hubble Space Telescope

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