researchers

We thought we were 8 billion people on the entire planet. Until some researchers started crunching the numbers

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In November 2022, the UN celebrated that we were now 8 billion humans on Earth. They are estimates, of course, but beyond the figure, the really interesting thing is that in 2023 we do not reach the replacement rate and that humanity will reach its peak at the end of the century to, inevitably, start to fall. But… to what extent can we trust these accounts? It is something that has been on the table for some time and, according to a study of 2025, we have made a mistake in counting. So much so that we have left several hundred million people behind. Can we trust the numbers? “Calculating the number of people on the planet is an inexact science.” That was demographer Jakub Bijak’s comment to BBC in mid-2024, just when the World Population Prospects study. Something scientific is something exact, but the researcher also commented that the only thing you can be sure of when predicting population figures is the lack of certainty. That, be careful, does not mean that demographers take figures out of thin air. “It is a difficult thing based on our experience, knowledge and every piece of information we have access to,” said Toshiko Kanera, an expert in demographic forecasts. Demographers draw on the data and trends of each country since 1950, but… what if it had not been counted correctly? We are missing millions. In a 2025 study published in Natureresearchers at Aalto University in Finland show how the data sets handled by demographers “profoundly and systematically” underestimate population figures around the world. The serious thing is that we would be talking about hundreds of millions more people living on Earth. Example of the tools that demographers use in their analysis. Each one corresponds to a different bias Rural areas. Josias Láng-Ritter is one of the researchers in charge of the study and points to the accounts carried out in a specific segment: that of rural population. “For the first time, our study provides evidence that a significant proportion of the rural population could be missing from global population data sets,” he notes. As we say, we are not talking about a few million, but billions. “Depending on the data set used, rural populations have been underestimated between 53% and 84% in the period studied. The results are notable, since these data sets have been used in thousands of studies and have widely supported decision making, but their accuracy has not been systematically evaluated,” comments the researcher. The map shows the location of the 307 rural areas analyzed in the study. The populations reported in the graph were found to be underestimated by between 53% and 84% | Aalto University Biases. Attempts to review this data are not new, but previous research has focused on specific countries or urban areas. Researchers from Aalto University wanted to give a more global picture by comparing the five most used population data sets worldwide. They have used maps that divide the planet into high-resolution grids and have taken something very specific as a reference: resettlement figures from more than 300 rural dam projects in 35 countries. Why this bias of the dams? Because when a dam is builtthe population that lives in the area that will be flooded is relocated and accurate resettlement data is usually available. Comparing that population data from 1975 to 2010, the researchers found that the 2010 maps were more accurate, but still left out between 32% and 77% of the rural population. Between 2015 and 2020 the data sets were updated, but demographers continue to believe that underestimation of the rural population continues to exist and is a problem that persists in all regions of the world. Consequences. And we are talking about a problem whose resolution is complex. According to the researchers, no matter how much the data is reviewed, it is a structural problem. Governments do not have the resources to collect accurate data in these rural regions, there is a huge discrepancy between the real population and that reported on the population maps used to carry out demographic studies and that influences decision making. Average percentage of rural population underestimated (red and orange) and overestimated (blue) | Aalto University And it’s important. Current estimates place 43% of the 8.2 billion inhabitants of the world in rural areas -about 3,526 million people- and if we take into account that it is a percentage that has been underestimated between 53% and 84%, we are not talking about a small population, precisely. And it is essential to know exactly how many we are for a simple reason: the redistribution of resources. No data. The lack of accurate demographic records can affect political decision-making. Ritter gives the example of social decisions. “In many countries, there may not be enough data available at the national level, so they rely on global population maps to support their decisions: Do we need a paved road or a hospital? How much medicine is needed in a specific area? How many people could be affected by natural disasters like earthquakes or floods?” he says. Doing quick math, in the best scenario – that of 53% deviation in the rural population – we would be talking about 1,869 million people who would not have been counted. In the worst case, in that of the 84% not registered, we would talk about 2,962 million people. In the Nature study, they give the example of Paraguay, which in the 2012 census may have left out a quarter of the population. Reviewing the methods. In the team’s analysis, there are countries that fare better than others. They point to Finland as an example of reliable data, even in rural regions, because they began keeping digital records of the population 30 years ago. However, in countries where this thorough digital registration has taken longer to be implemented due to crises of any kind, the differences between the real population and the estimated one can be significant. “To provide rural communities … Read more

Skyscrapers are full of glass, so some Spanish researchers have had an idea: let them serve as "solar panels"

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Every 60 minutes, the Sun bathes the Earth with enough energy to cover the world’s consumption for an entire year. The data, remembered by the Polytechnic University of Madrid (UPM)it’s overwhelming. But there is a problem: harnessing all that energy in our cities hits a literal wall. Classic solar roofs are becoming too small for us in increasingly dense cities, and hanging rigid and heavy panels on the facades of buildings is not a realistic option. To avoid this aesthetic and space blockage, the laboratories have found a pioneering solution: using new two-dimensional materials. These are microscopic layers that will allow the windows of any skyscraper to be converted into totally invisible solar panels. With Spanish seal. The Silicon and New Concepts for Solar Cells (SyNC) research group of the Solar Energy Institute (IES) of the Polytechnic University of Madrid (UPM) has managed to manufacture micro-prototypes of ultra-thin and highly efficient solar cells. The secret of this technology lies in the so-called two-dimensional photovoltaic materials. Imagine a sheet so thin that it is only a few atoms thick; For all practical purposes, it is so thin that physics considers it to lack a third dimension. Science knows this family of compounds with a complex name, transition metaldicalkogenides (TMDC), among which molybdenum disulfide (MoS2) and tungsten diselenide (WSe2) stand out. Their great rarity—and their greatest virtue—is that, despite being an almost invisible layer, they have an extraordinary capacity to absorb sunlight. In Xataka Solar panels have an invisible and very brief moment in which they do not work. And solving it is key to your future The actual scope. To understand this technology, researchers published a study in the scientific journal Nano Energy. In it, they simulated what would happen if the façade of a real skyscraper, the Torre Picasso in Madrid, were covered with semi-transparent windows made with these materials. The results estimate that between 16% and 23% of the building’s daily electricity consumption could be covered. If this technology is also combined with areas of opaque modules, the generation could exceed 30% of the energy needs of the skyscraper. Natural light, real colors and savings on the bill Historically, the big “but” of solar windows has been the poor visual quality. Alternative technologies, such as organic or perovskite cells, often act as a filter that colors the light entering the room in unnatural reddish, yellow or brown tones. As explained by UPM researchersthe structure of TMDC materials solves this root problem: they allow a very balanced absorption of visible light, which eliminates the problem of unwanted “coloring” of light. The result is lighting with a natural and warm tone, achieving a Color Rendering Index (CRI) greater than 90, a very high quality metric for work spaces. In addition to generating electricity, in very sunny places like Spain, these glasses naturally block excessive glare. This means that the skyscraper not only produces its own energy, but also saves a lot of money by not having to turn on the air conditioning as much. From the microscopic laboratory to the factory. Creating these ultra-thin solar cells is a work of very high precision. To manufacture the prototypes in the laboratory, the UPM team has used a technique called hot-pick-up. Using this method, they use a small transparent bubble to select, collect and deposit fragments of the materials, creating tailored stacks that combine the best properties of each one. But the goal is not to stay in the laboratory. IES-UPM researchers are already working with new techniques to scale this process and cover large areas, such as entire windows. According to the scientists themselves“through spraying and deposition techniques of these solutions, manufacturing processes could be scaled, reducing costs and allowing the industrialization of this disruptive technology.” The ace in the hole: catch the lost heat. The potential of these two-dimensional materials goes far beyond solar windows. Another investigation from the same team, published in the scientific journal ACS Applied Energy Materials, demonstrates that by modifying molybdenum disulfide (MoS2) with an element called niobium, the material acquires impressive thermoelectric properties. More simply, this means that in the future, these materials could not only capture sunlight, but could also have applications in thermal sensors or in the recovery of energy from the heat wasted by machines or buildings themselves. {“videoId”:”x81qnhf”,”autoplay”:false,”title”:”Is it possible to generate energy at zero cost?”, “tag”:”Energy”, “duration”:”109″} The new skin of the city. The lightness, flexibility and low manufacturing cost of these solar cells makes them one of the most promising options to achieve the desired “green cities”. Two-dimensional photovoltaic technology shows us that the ecological transition in dense urban environments no longer depends only on finding space on roofs to place large rigid panels. The real paradigm shift consists of transforming the very “skin” of buildings – their windows, their walls, their facades – into active sources of clean energy, ensuring that any surface can be an ally against climate change. Image | Photo by Arthur Mazi on Unsplash  Xataka | Plastic solar panels have always been more of a dream than reality: China has just changed that (function() { window._JS_MODULES = window._JS_MODULES || {}; var headElement = document.getElementsByTagName(‘head’)(0); if (_JS_MODULES.instagram) { var instagramScript = document.createElement(‘script’); instagramScript.src=”https://platform.instagram.com/en_US/embeds.js”; instagramScript.async = true; instagramScript.defer = true; headElement.appendChild(instagramScript); – The news Skyscrapers are full of glass, so some Spanish researchers have had an idea: let them serve as “solar panels” was originally published in Xataka by Alba Otero .

Researchers have discovered “lost continents” from 4 billion years ago

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The idea we have of the early Earth involves a huge ball of incandescent magma and conditions incompatible with life. The problem? That there are no rocks from 4.3 billion years ago to confirm this consolidated theory. What we do have are some microscopic crystals called zircons. And zircons are telling a different story, according to this study by a research team at the University of Wisconsin-Madison. published in Nature. What zircon says. Regarding the behavior of the Earth’s surface, geology valued two ideas for that period known as Hadean: that there was a plate tectonics where one plate sinks under another or that the Earth had a kind of stagnant lid, a rigid and hot surface where heat only escaped through large columns of magma. Well, neither one nor the other, both: zircons leave evidence of an Earth that already had oceans, liquid water and a crust that alternated both systems. John Valley, the University of Wisconsin-Madison geoscientist who leads the study explains that “There were about 800 million years of Earth’s history in which the surface was already habitable, although we have no fossil evidence and we do not know when life first emerged.” Why it is important. Because they determine that the Earth did not choose a single model, but rather that both processes took place at the same time in different places. Of course, it was not a stable plate tectonics like the one that exists today, but rather it had violent and short episodes of sliding of the edges of one plate under another (subduction) that coexisted with large jets of magma that rose from the interior of the Earth. This discovery is key to understanding how the Earth’s surface moved, the formation of continents and life. On the one hand, without tectonics, the felsic continental crust that floats on the mantle and makes up the lands on which we live would not exist. On the other hand, plate tectonics regulates the climate and recycles nutrients, so knowing when it started working helps understand when the Earth became a place compatible with life. How they analyzed it. The John Valley team analyzed the popular zircons from Jack Hills (Western Australia). These sand-sized minerals are a kind of time capsule, housing the only direct record of Earth’s first 500 million years. They were looking for chemical “fingerprints” that would reveal where and how they were formed, for which they used technology WiscSIMS high resolution. They then compared the results of the analysis with other zirconiums from the Hadic Eon found in Barberton (South Africa). Each one told a different story. Surprises in the “DNA” of the mineral. 47% of oceanic zircons had high levels of Uranium compared to Niobium, indicating that they formed in subduction zones where ocean water sinks into the mantle. On the other hand, the South African zircons show that they were born from virgin rock from the planet’s interior, confirming the classic ‘stagnant lid’ theory by which the Earth’s first solid surface was rigid and immobile. Or what is the same: while in Australia the crust sank and created protocontinents, in what is now South Africa the Earth behaved differently, with a rigid and stagnant crust. That is, the early Earth was a mosaic of tectonic styles. The Earth did not go from being hell to what it is today overnight, but rather it was a hybrid process and generated the necessary conditions for life sooner than we thought. In Xataka | We know it as “the red planet”, but 3.37 billion years ago Mars was almost as blue as Earth In Xataka | 4.5 billion years of Earth’s history, summarized in a spectacular video map Cover | Tomáš Malík and Javier Miranda

AI is very comfortable inventing everything it doesn’t know. Some researchers think they know how to stop him

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The hallucinations have been the Achilles heel of AI since chatbots began to be part of our lives. Companies like OpenAI promised that hallucinations could be mitigated with adequate training processes, but years later both ChatGPT and its direct rivals They keep making up answers when they are not sure what to say. Shuhui Qu, a researcher at Stanford University, believes she has found a way to address the problem. A structural problem. Current language models have a factory defect: they respond with complete security even when they have no idea nor the necessary information. This has to do with how they progress when processing any answer, since LLMs have no problem completing the missing information, even if they are not being faithful to reality and are working with assumptions. First thing, recognize it. Shuhui Qu, a researcher at Stanford University, publishes an article in which she introduces what she calls Bidirectional Categorical Planning with Self-Consultation. An approach that starts from a simple idea, but uncomfortable for large technology companies: forcing the model to explicitly recognize what it does not know and not move forward until solving it. A more scientific method. The idea is not that the model think betterBut stop pretending you know everything. The approach of What starts from a basic premise: every time the model takes a step in its reasoning, it should ask itself if it really has the necessary information to do so. When an unknown condition appears, the model cannot continue. You are not allowed to fill the gap with an assumption, and you have to stop to resolve the uncertainty before moving forward. You can do this in two ways: Well asking a specific question to obtain the missing information Either by introducing some intermediate step (verification, additional consultation) that becomes part of the chain of reasoning. The method. The researchers, using external code, made models like GPT-4 They responded only when they had complete information. They did it with simple tasks, asking about cooking recipes and Wikihow guides. The key? They purposely withheld information to force him to stop. The conclusion of the research was that making preconditions explicit and verifying them before moving forward significantly reduces LLM errors when information is missing. Of course, along the way it is admitted that even this is not enough to make the hallucinations disappear completely. not so fast. Although the researcher’s idea sounds brilliant, it is quite unlikely to see it in the short and medium term. This way of processing breaks the natural flow of current LLMs, designed to return complete answers. To make such a system work, it is necessary to add an additional layer to the structure, some preconditions that force it to control the calls, interpret the responses themselves, classify them and self-block from asking questions if they do not have all the information. In other words, for the moment, AI will continue to score the triples to which we are already accustomed. Image | Xataka In Xataka | ChatGPT invents data and that is illegal in Europe. So an organization has set out to fix it with a lawsuit

Researchers extracted photos and statuses from 3.5 billion WhatsApp users. Meta didn’t react until they told him.

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Between December 2024 and April 2025, a team from the University of Vienna identified 3.5 billion active phone numbers on WhatsApp (practically its entire user base) from a single server and without encountering too much technical resistance. They processed more than a hundred million numbers per hour and extracted not only the existence of accounts, but also public keys, profile photos, status texts, and device metadata. They did it without having to hide, from the same university IP, same server, five accounts. For four months, no one in Meta noticed. Why is it important. This is not the first time that this vulnerability has been demonstrated, as it has already occurred in 2012 and 2021but the first at this scale and speed. The finding exposes a structural contradiction in WhatsApp: Your architecture should show whether a number is registered to enable contact discovery… …but that functional need collides with the privacy of its users. Knowing who uses WhatsApp in countries where it is prohibited, such as China, Burma or North Korea, can have serious consequences. There they detected 2.3 million, 1.6 million and five accounts respectively (not five million, just five). The investigation, published a few weeks ago in NDSS 2026shows that this crack not only persists, but has widened. The context. The researchers developed ‘libphonegen’, a tool that reduces the search space from billions of theoretical combinations of possible mobile phone numbers to “just” 63 billion real candidates for 245 countries. Using unofficial WhatsApp clients that directly access the XMPP API, they queried these numbers at a rate of 7,000 per second. Neither his IP was blocked nor his accounts sanctioned. Meta did not respond until researchers explicitly reported the finding in March of this year, and countermeasures did not arrive until October, just a couple of months ago. The figures. He dataset resulting five times higher the scandal of scraping from Facebook 2021: India leads the document with 749 million users (21% of the total), followed by Indonesia and Brazil. In Spain, 46.5 million accounts. 81% use Android. More than half have a public profile photo. 29% have the status text visible. Between the lines. The researchers were able to infer the operating system by analyzing initialization patterns of the cryptographic keys. Android starts certain identifiers at zero. iOS does this in random values. This detail matters because iPhone users are higher-value targets for attackers. They also detected that public keys are reused. They found 2.3 million different keys used on 2.9 million different devices. In Burma and Nigeria, tens of thousands of numbers shared the same key, pointing either to faulty implementation or outright fraud. They even found twenty American numbers that use a private key composed only of zeros. In detail. The method is not limited to confirming the existence of the accounts. For each one they extracted public keys, timestamps and the list of linked devices. This allows you to build detailed profiles without accessing the content of the messages. The age of the device can be estimated by counting key rotations. The “popularity” of a user is inferred by the frequency of depletion of their prekeys single usewhich are consumed every time you start a new conversation. Researchers downloaded 77 million profile photos of the +1 rank (prefix for the United States and Canada) in a matter of hours. 66% of them contained recognizable faces. They also found disturbing status texts, such as those from traffickers listing prices, accounts business advertising drugs or publicly visible corporate emails from governments and armies. And now what. Meta has deployed probabilistic cardinality counters to limit how many unique accounts a user can query without blocking legitimate contact discovery. It has also restricted bulk access to status photos and texts. The researchers confirmed that the measures work in subsequent tests. But no countermeasures protect those who were already listed during the months in which the system has been wide open. The big question. For four months, from a university server without even hiding their identity, they looted practically the entire user base of the most used application on the planet without anyone at Meta realizing until they were explicitly told. If these researchers were able to do it under these conditions, who else did it before without telling anyone? In Xataka | WhatsApp brings the big update of the season: the most important change is not on the mobile, but on the computer Featured image | Dimitri Karastelev

Researchers removed Instagram and TikTok from 300 young people to see if their anxiety decreased. The results speak for themselves

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The debate about whether social networks are the new tobacco for the mental health of the generation Z It’s been on for years. There are many young people who They can’t go without watching TikTok completing the streak with their friends, uploading stories of what they eat to Instagram or simply away from the cell phone. And this is something that can be tremendously harmful. What we knew. Until now we could make one of them, and parents undoubtedly remember this message when they spend many hours in front of the phone. Even companies offer the tools to be able to limit the amount of time that we spend in an app and it even applies limits to us. With numbers. But now science has shed light on this problem with a published study in JAMA Network Open that provides concrete data. The premise was simple: ask a group of young adults (ages 18 to 24) to reduce their consumption of social networks this week. Once done, we wanted to see if the symptoms of anxiety, depression or insomnia were reduced. And it is precisely the excessive use of social networks is related to depressionsince it generates social isolation, low self-esteem, cyberbullying or even physical disorders due to the effects of blue light from the screen. So… Does giving up the cell phone also improve the quality of life of young people? The study. To do so, they not only focused on what users said they did with their mobile phones, since lying can be very easy in this case. What they did was passively record what was done with the phone through the ‘digital phenotyping‘. In total, there were 373 participants in this study, of which only 295 were able to complete the intervention, which was completely voluntary. They only had to reduce consumption for one week of the main social networks: Facebook, Instagram, Snapchat, TikTok and X. The results. Simply put, the results showed significant clinical improvement across key areas after just seven days. The data indicated that depression symptoms were reduced by 24.8%, anxiety by 16.1% and sleep problems fell by 14.5%. Interestingly, the study found that the effects were much more pronounced in those participants who already had symptoms of moderate or severe depression at the start of the experiment. Don’t let go of your cell phone. A priori, one might think that when a young person automatically leaves social networks aside, their cell phone will be of absolutely no use to them. But nothing could be further from the truth. He digital phenotyping revealed that although social media use fell from about 2 hours a day to just 30 minutes, total screen time increased slightly by 4.5% and participants spent 6.3% more time at home. In this way, users replaced the infinite scrolling of TikTok with other digital activities such as messaging, browsing the internet or even playing games. However, despite still being glued to the screen, mental health improved. This reinforces a theory that is gaining weight among experts: the problem is not the screen itself, but how we use it. The study points out that objective use time has a weak association with mental health, since what is really harmful is “problematic use”, such as negative social comparison or emotional addiction to platforms. Easier apps to leave. We can all have more ‘affection’ for a specific social network, which is surely more difficult to stop using. In this case, it was seen that it was easier for users to reduce the time they spent on TikTok or X. But Instagram or Snapchat were the “hard bones” to beat. Specifically, 67.8% of Instagram users and 48.8% of Snapchat users failed to comply with the reduction and continued to use them significantly during the detox process. It is not a treatment. Although the percentages sound like a victory, it is necessary to maintain the usual scientific skepticism. Dr. John Torous, co-author of the study, warns in statements collected for him New York Times that reducing networks “would certainly not be your first or only form of treatment (for mental health problems),” although it is worth experimenting with. This focuses on the fact that the study has some limitations such as the lack of a reference control group and it was not seen how long the detoxification process from social networks lasted. But what did not improve was loneliness, since eliminating these social networks in people can have the opposite effect by also cutting the connection link that unites them with other people. Images | Panos Sakalakis Vitaly Gariev In Xataka | Social networks were once a place to tell our lives. Now the trend is different: “zero posts”

Chinese researchers wanted to know if it was possible to block Starlink in Taiwan: now they have an awkward answer

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Communications have become the invisible thread that sustains any modern military operation. Troops, vehicles or missiles are no longer enough: without a stable and resilient network, the situation can become complicated. During the Ukrainian war, Starlink demonstrated be able to keep Ukrainian forces connected even under pressure, and has since been placed at the center of the debate over its role in military scenarios. According to South China Morning Posta group of Chinese researchers linked to defense institutions has examined to what extent that network could resist a large-scale interference attempt on a territory like Taiwan. Starlink is not a typical satellite network. Instead of relying on a few high-altitude satellites in fixed positions above the equator, it is made up of thousands of small satellites that orbit the Earth at low altitudes and on changing routes. This architecture allows a terminal on the ground to not always connect to the same satellite, but to jump between several in a matter of seconds, forming a flexible mesh that is difficult to interrupt. That dynamic behavior largely explains why it has become a key element in debates about electronic warfare. A laboratory experiment. The study that has put numbers to this scenario is titled “Simulation research of distributed jammers against mega-constellation downlink communication transmissions” and appeared on November 5 in the Chinese magazine Systems Engineering and Electronics. It is signed by a team from Zhejiang University and the Beijing Institute of Technology, an institution with a prominent presence in the country’s military research. It should be noted that it is not an operational document or an official proposal from the Chinese Army, but rather an academic simulation that explores, from a technical point of view, what it would take to interfere with a network like Starlink on a regional scale. {“videoId”:”x9ri2iu”,”autoplay”:false,”title”:”How China, the biggest polluter on the planet, has also become the complete opposite”, “tag”:”webedia-prod”, “duration”:”740″} A constellation designed to avoid interference. The study does not limit itself to describing that the terminals change satellites, but analyzes how this change thwarts any attempt at sustained interference. When a hostile signal affects a link, the terminal automatically redirects traffic to another visible satellite, and the network adapts the channel and frequency in real time. That reaction, combined with highly directional antennas capable of concentrating the signal toward specific points, reduces the impact of interfering emitters. The researchers highlight that even if a connection is momentarily blocked, the network can restore communication from another angle or frequency almost immediately. A thousand drones in action? The simulation was based on real data from Starlink’s orbital positioning and modeled how the signal would behave for twelve hours over eastern China. The researchers placed a virtual network of jammers 20 kilometers high, spaced between five and nine kilometers apart, as if they formed a checkerboard in the sky. The study considers that these nodes could be installed on drones, balloons or similar aerial platforms, capable of supporting coordinated interference systems. Using 26 dBW power and narrow beam antennas, each node managed to block an average of 38.5 square kilometers. With that efficiency, at least 935 units would be needed to cover a territory the size of Taiwan, not counting redundancies, failures or geographical barriers such as mountains. In Xataka China is sending drones to an island 100 km from Taiwan. The problem is that Japan and the US are filling it with missiles The authors themselves acknowledge that their results are only an approximation. They explain that they do not have real data on the radiation patterns of the terminals or measured signal suppression coefficients, which limits the precision of the simulation. They also do not know Starlink’s internal adaptation mechanisms against coordinated interference. Even so, they consider that the model serves to estimate the scale of the necessary effort and opens a line of study that allows quantifying, although imperfectly, how a blocking strategy would work in a real scenario. Images | starlink In Xataka | Starlink satellites have transformed war: China and Russia work on “Starlink Killers” to deactivate them (function() { window._JS_MODULES = window._JS_MODULES || {}; var headElement = document.getElementsByTagName(‘head’)(0); if (_JS_MODULES.instagram) { var instagramScript = document.createElement(‘script’); instagramScript.src=”https://platform.instagram.com/en_US/embeds.js”; instagramScript.async = true; instagramScript.defer = true; headElement.appendChild(instagramScript); – The news Chinese researchers wanted to know if it was possible to block Starlink in Taiwan: now they have an awkward answer was originally published in Xataka by Javier Marquez .

Researchers find a piece of ice from six million years ago. What is really valuable is the air trapped inside

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A team of scientists has achieved something extraordinary in the frozen Allan Hills, east of Antarctica: extracting 6-million-year-old ice samples, the oldest ever directly dated. Trapped inside are air bubbles that date back to Earth’s Miocene atmosphere, when our planet was much warmer and sea level considerably higher than today. A time capsule in the form of ice. The discovery, published in the journal PNAS on October 28 and led by Sarah Shackleton of the Woods Hole Oceanographic Institute and John Higgins of Princeton University, more than doubles the age of the oldest known ice so far, which dated to about 2.7 million years ago. “Ice cores are like time machines that allow scientists to take a look at what our planet was like in the past,” explains Shackleton. “The Allan Hills cores help us travel much further back than we thought possible.” How they found it. Between 2019 and 2023, the Center for the Exploration of Older Ice (COLDEX) team drilled between 100 and 200 meters deep into the ice sheet in the Allan Hills region, located about 2,000 meters above sea level. Just like they count From the Middle Space, this area is especially valuable because the topography of the terrain and ice flow patterns allow extremely old ice to be preserved closer to the surface, unlike the Antarctic interior where it would be necessary to drill more than 2,000 meters to reach similar ages. Dating. The researchers They determined the age of the ice measuring the radioactive decay of argon isotopes present in trapped air bubbles. This method allows ice to be dated directly, without the need to examine the rocks or soil around it. The result: 6 million years, a time when the Earth was home to now extinct creatures such as saber-toothed tigers, arctic rhinos and the first mammoths. Cooling. Analysis of oxygen isotopes in the cores revealed that the Allan Hills region has cooled approximately 12 ºC during the last 6 million years. It is the first direct evidence that quantifies how much the Antarctic climate has cooled since that ancient warm period. Ed Brook, director of COLDEX and paleoclimatologist at Oregon State University, stands out that “the team has built a library of what we call ‘climate snapshots’ about six times older than any previously reported ice core data.” Why does it matter? While Antarctica and the Earth as a whole have progressively cooled for millennia, humans are now rapidly increasing global temperatures by release large amounts of greenhouse gases to the atmosphere. Studying these bubbles of ancient air will allow scientists to reconstruct past greenhouse gas concentrations and ocean heat levels, which could give us clues to what natural factors have contributed to the climate. climate change throughout the entire history of our planet. Surviving extreme conditions. “We are still discovering the exact conditions that allow such ancient ice to survive so close to the surface,” points out Shackleton. “Along with the topography, it’s likely a mix of strong winds and intense cold. The wind blows fresh snow and the cold slows the ice almost to a stop. That makes Allan Hills one of the best places in the world to find shallow old ice, and one of the toughest to spend a season in the field,” he continued. Next steps. The COLDEX team plans to return to Allan Hills in the coming months to carry out more drilling. They hope to recover even older samples and produce a more detailed record of Earth’s ancient atmosphere. “Given the spectacularly old ice we have discovered in Allan Hills, we have also designed a new comprehensive long-term study of this region to try to extend the records even further in time, which we hope to carry out between 2026 and 2031,” concludes Brook. Images | COLDEX In Xataka | What are sixth generation fires: the megafires that create their own weather

8 kilometers of ice have been lost in two months and researchers only agree on one thing: it is something to worry about

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Predict their future the antarctic glaciers It is undoubtedly a great challenge for science, but the most important thing above all is to know How will it affect global sea level?. The worst of all is that the latest news we have at our disposal is not at all positive, since the Hektoria glacier It has retreated 8 km in just two months, which is an unprecedented speed in the modern era. Where we start from. Normally, the retreat of glaciers It is measured in hundreds of meters per year. It is one of the clearest metrics we have to be able to ‘measure’ global warming, and that is why now what a team from the University of Colorado Boulder has just recorded on the Hektoria glacier, on the eastern peninsula of Antarctica, plays in a completely different league. The measurement. In just two months during 2023, the Hektoria lost almost half of its mass. In total, 8 kilometers of ice disappeared. A speed of collapse that has never been seen in modern history and that, according to the authors of the study, is more typical of the end of the last ice age. Something that doesn’t add up in this case. Hektoria is relatively small by Antarctic standards (about 300 km², less than the city of Malaga), but its collapse was so sudden that it left researchers stunned. A coincidence. Ironically, the research team wasn’t even studying Hektoria. They were analyzing satellite and remote sensing data for another project when Ochwat realized that the glacier had essentially disappeared from the images. The measurements. This is where technology comes into play. The team had to combine data from multiple satellites to understand what had happened and, above all, how quickly he did it. “If we only had one image every three months, we couldn’t say that the glacier lost two and a half kilometers in two days,” explains Ochwat. In this case, by combining images from different satellites you can fill in the time gaps and confirm with evidence in hand how quickly the ice has been melting. But the key was not only in the images. They also used seismic instruments that have the ability to detect a series of “glacial earthquakes” that occurred exactly during the period of rapid melting. And these earthquakes are not measured for the sake of it, but to confirm something crucial: the glacier was anchored to the bedrock (and not floating) just before breaking. This is fundamental both for science and for the entire planet, since ice that is floating (such as an ice shelf) does not raise sea level when it melts, any more than an ice cube does in a glass of water. But ice that rests on land (or anchored to a seabed) and falls into the sea does contribute to the global rise in sea level by increasing its volume. Your Achilles heel. The collapse was not due to simple superficial melting. The cause was topographic, since many Antarctic glaciers rest on deep canyons or underwater mountains. The Hektoria, however, had the misfortune of resting on an “ice plain”: an area of ​​bedrock that was exceptionally flat and below sea level. This flat topography caused a gigantic section of the glacier to begin floating all at once, rather than gradually. The moment the glacier lost its anchorage to the ground (its “line of support”), it was exposed to the forces of the ocean, and therefore everything began to advance very quickly. The process was brutal, since it all began with the warmest ocean water that seeped underneath and began to open cracks from the bottom of the glacier upwards. At the same time, the glacier already had cracks on the surface. Eventually, the lower and upper cracks met and the glacier literally disintegrated. A warning for future glaciers. The Hektoria case is a first-rate warning. Scientists know that there are numerous glaciers in Antarctica that also rest on these types of ice plains. Until now, it was thought that their collapses would be centuries-long processes. Hektoria shows that they can be months, which should set us off due to the implications it would have on sea level. And while the collapse of a small glacier like Hektoria won’t dramatically change global sea level, it alone does demonstrate that a rapid collapse mechanism, until now theoretical or believed to be typical of past geological eras, is perfectly possible today. If this same mechanism is activated in much larger glaciers, sea level rise could accelerate very considerably and much sooner than expected. Images | Cassie Matias In Xataka | When glaciers melt, bodies appear: archaeologists are recovering them in a time trial

We thought two-step authentication apps were secure. Researchers have shown how easy it is to hack them

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The two-step verification With authentication apps it is one of the safest methods to protect our accounts, or so we thought. They count in Ars Technica that a group of researchers from several American universities have discovered a new type of attack on Android that is capable of copying these codes in less than 30 seconds, which is precisely the time it takes to refresh. Pixnapping. It is the name of this new attack capable of stealing two-step authentication codes from apps such as Google Authenticator or Microsoft Authenticator. These apps show codes that are automatically refreshed every 30 seconds, so it is more secure than, for example, SMS verification, which usually gives a margin of 10 or 15 minutes to copy the code. With this technique, researchers have managed to crack the six-digit code in just 23 seconds, which leaves plenty of time to use the code and log in to the account they want to steal. How it works. Any app on Android can launch a pixnapping attack without needing to obtain special permissions. Once underway, the attack occurs in three steps: The malicious app uses Android APIs to communicate with the app it wants to spy on. These calls force the target app to display specific data (the authentication codes) and send this information to the Android rendering pipeline, which is responsible for displaying each app’s pixels on the screen. Pixnapping performs graphical operations on the pixels that have been received by the rendering pipeline. Identify the coordinates of each pixel of interest and check if the color is white or non-white. White pixels take less time to render than non-white pixels. By measuring time, pixnapping is able to reconstruct images from the render pipeline data. Speed ​​is key. Pixnapping can also obtain other types of information that is visible on the screen, such as account numbers or personal information, but the speed with which it runs makes it especially dangerous for these authentication apps. To achieve this, the researchers reduced the number of samples per pixel, so that they could decipher all six digits in 30 seconds. Which phones does it affect? As we said, pixnapping only affects the Android operating system, but it seems to extend to quite a few versions. The investigation verified that the attack could be carried out on devices with versions from Android 13 to Android 16. They have only reproduced it on Pixel phones and a Samsung Galaxy S25, but they believe that due to the mechanism of the attack, any Android will be affected. How to protect yourself. Waiting for now. Google has already released a patch does little to mitigate this attack, but they have found that there are ways to bypass it. In statements to The RegisterGoogle confirmed that they would release a second patch in December to put an end to it. The good news is that they say they have no evidence that there are apps taking advantage of this vulnerability. Image | Pixnapping In Xataka | One click and goodbye to our passwords. This is the vulnerability that affects the extensions of several managers

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