plastic

Turning plastic into fuel profitably was a pipe dream. A new process just made it possible

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A team from the Oak Ridge National Laboratory, in the United States, has achieved convert plastic bags and kitchen boards into gasoline and diesel without having to resort to high temperatures or expensive materials. The discovery, published in the Journal of the American Chemical Society, has raised some eyebrows and below we tell you all the details. The problem they are trying to solve. The plastic is one of the most difficult materials to recycle profitably. Specifically, polyethylene (the polymer that makes up supermarket bags, white plastic containers or kitchen cutting boards) accumulates millions of tons in landfills each year. Until now, the only technically viable way to turn it into fuel was through a process called pyrolysis, which requires heating the material to temperatures between 450 and 500 degrees Celsius. An expensive, energy inefficient process that is difficult to scale to an industrial level. What does the new method consist of?. Researchers at Oak Ridge National Laboratory (ORNL) have opted for a different path: introduce the plastic into a mixture of molten salts with aluminum chloride, which acts both as a solvent and as a catalyst. These salts are inorganic compounds that remain stable even under demanding reaction conditions. The key is that the aluminum atoms in the mixture bind to the polymer and generate areas of high acidity that break the long molecular chains of the plastic into smaller fragments, which are transformed into molecules typical of gasoline or diesel. And all this at less than 200 degrees Celsius, a temperature comparable to that of a conventional domestic oven. Why it represents a relevant technical leap. Beyond the reduction in temperature, the process dispenses with three elements that make traditional methods more expensive and complicated: noble metal catalysts (such as platinum), organic solvents and external contribution of hydrogen. According to Zhenzhen Yanga scientist at ORNL and one of the lead authors of the study, “this is the first time that molten salts have been used as a means to produce high value-added chemicals from waste without any catalytic initiators or solvents, and at a temperature below 200 degrees Celsius.” Gasoline efficiency reaches approximately 60% in moderate conditions, a result that the researchers themselves describe as promising for its future industrial application. As they verified that worked. To understand exactly what happens during the reaction, the team used a combination of advanced analysis techniques, including soft X-ray spectroscopy, nuclear magnetic resonance, neutron scattering, and gas chromatography. Thanks to isotopic labeling, they were able to track how carbon behaves during the process and confirm that the simplest polymer chains produce gasoline-like fuel, while the more complex ones derive into diesel molecules. By having this level of detail, the process could be optimized depending on the type of fuel you want to obtain. What remains to be resolved. The system is not ready to scale immediately. The main obstacle is that the aluminum salts used are hygroscopic, that is, they absorb moisture from the environment, which compromises their long-term stability. The team working now on ways to confine or protect these saltspossibly using halides or carbon materials, to make them more durable under real industrial conditions. Mbeyond the laboratory. If the process manages to scale successfully, the implications are considerable. Polyethylene is the most produced plastic in the world, abundant and cheap to obtain as a raw material. Aluminum salts, for their part, are low-cost commercial materials. According to Liqi Qiua postdoctoral researcher at the University of Tennessee, “the starting material is abundant in consumer waste, and our catalyst system, molten aluminum salts, is very cheap.” The result could be a cost-effective route to converting plastic waste into high-quality transportation and industrial fuels, while also clearing up our landfills. At the moment the patent is pending, so we will have to wait to find out if this remedy ends up coming to fruition. Cover image | Elbert Lora and Marek Studzinski In Xataka | An 11,000 km ring around the Moon: Japan’s incredible plan to light up the Earth

Plastic is the great recycling nightmare. Car battery acid aspires to be the great nightmare of plastic

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Have a problem with recycling. Thus, in general and even in countries that the more they try and complicate things. But, specifically, we have a problem with plastic recycling. It is a difficult and therefore expensive process, rather than producing new plastic, which leads to a scenario in which potential waste accumulates. To complicate things further, there are many types of plasticsand some are terribly difficult to recycle. But the University of Cambridge has had an idea: a solar reactor to destroy those difficult plastics. And the secret ingredient is car battery acid. The data. Before entering the ‘invention‘ from Cambridge, let’s go with some context. Recycling is not collecting, and vice versa. An example of this is Japan, a country in which there are areas in which there are 45 different categories of garbage that citizens must separate and where only 20% is recycled. In Spain, with an infinitely less obsessive systemwe are around 39%. And what is not recycled is burned in Japan and sent to landfills in Spain. Focusing on plastic and according to Cambridge researchers, the world produces 400 million tons per year and only 18% is recycled. And, as I say, there are plastics such as nylon or polyurethane that are particularly complex to recycle because their chemical structure is very resistant, which makes breaking them down complex and very expensive. plastic fulminator. This is where the discovery of the University of Cambridge comes into play. What they have developed is a solar-powered reactor that uses a very special ingredient: car battery acid. This component breaks the structural chains of the polymers into more basic chemical blocks and, therefore, easier to assimilate, such as ethylene glycol. Once the new material is obtained, a very special photocatalyst is what allows it to be converted into hydrogen and acetic acid, putting an end to that ‘rebellious’ plastic. By fluke. The team of researchers comments that the discovery was practically an accident since they knew that battery acid could be used for the process, but it was not convenient because, just as it melts plastics, it ‘eats’ the catalysts. Theirs, however, held out, and it turns out to be cheap and scalable. It is a photocatalyst composed of carbon nitride functionalized with cyanamide and integrated with molybdenum disulfide promoted with cobalt. Lots of text to say that it is a hybrid material specifically designed to remain stable in a strongly acidic environment. According to the team, it is economical and solves two problems at once: it dissolves difficult plastics and reuses battery acid that usually ends up as waste after extracting its lead content for resale. Future. In the tests, the team points out that the system has worked for more than 260 hours without losing performance and works with the aforementioned plastics, but also with that of the plastic bottles They are also not particularly easy to deal with. They claim that their discovery offers a potential cost reduction in recycling tasks because, in addition, reusable hydrogen is produced in the process. The key here is finding a way to collect the battery acid before it is neutralized for uninterrupted use to break down plastics. The team comments that they do not promise to solve the problem, but they demonstrate how waste can become a resource. new life. This approach approaches the problem from the angle of decomposition, but there are other proposals to give these plastics a second life. Because ‘melting’ them may be expensive, but if they are put into presses they can be turned directly into bricks or paving stones for the streets. This is what Nzambi Matee proposes, a Kenyan materials engineer who has proposed convert that waste into construction material. Like the University of Cambridge experiment, it addresses two problems at the same time: recycling and creating necessary non-polluting construction elements, and this idea is catching on because the authorities have given the green light to use this 2.0 brick to pave the streets of Nairobi. Returning to battery acid, the business arm of the University of Cambridge is looking to commercialize the company, but now the most complicated thing remains: making it a standard. Images | Cambridge University (Beverly Low) In Xataka | The big problem with nuclear energy has always been its waste. Russia can now recycle them up to five times

To survive the end of oil, China has resurrected an old German technology from World War II: turning coal into plastic

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While the world assumes that China’s energy transition is based exclusively on solar panels and electric vehicles — and, in part, it is, consolidating as the first great ‘electrostate’—, reality hides a much darker side. Faced with the outbreak of the Third Gulf War, Beijing has not even flinched. Beyond its immense strategic oil reserves, the secret of its resistance lies in an even more daring maneuver: the resurrection of German technology from World War II. An old German technology. Faced with the instability of oil imports, China has perfected the use of coal to produce petrochemical products. This synthesis technology (historically known as the process of fischer–Tropsch) was originally developed by Germany to sustain its military economy during World War II. Although it is widely known in the chemical industry, its main defect has always been the enormous pollution it generated. China has improved it. Far from settling for an outdated process, Chinese researchers have radically improved it. According to the state agency Xinhuaa team from Peking University has achieved a historic breakthrough by adding a minimal amount of methyl bromide (five parts per million) to the catalytic process. This surgically “turns off” the pathway that forms carbon dioxide as a byproduct, reducing these emissions from 30% to less than 1% and opening the door to near-green manufacturing to convert coal-derived synthesis gas (syngas) into olefins, the building blocks of plastics. At an industrial level, expansion is already a fact. As detailed South China Morning Postin Turpan prefecture (Xinjiang), construction has just begun on the world’s largest coal-to-ethylene glycol (a toxic compound used for plastics and antifreeze) project, with an astonishing capacity of 2.4 million tons per year. Even, as the magazine highlighted ACS Sustainable Chemistry & Engineeringresearch is being carried out on how to integrate this process (called PFTO) to chemically recycle tons of plastic waste, converting it into syngas and then back into light olefins. Did you see it coming? It is not the first time that China decides to take sides and prevent rather than cure. The Asian giant has decided to completely decouple its industry from maritime vulnerabilities and Western influence. “This is not China’s war, but Beijing began preparing for it years ago,” points out The New York Times. Everything accelerated during Donald Trump’s first term, prompting President Xi Jinping to demand complete “self-sufficiency” that would insulate China from any disruption to foreign supply chains. Time has proven them right. The war in Iran has brutally increased the price of crude oil, suffocating international petrochemical competitors that depend on black gold. In contrast, local Chinese coal has only gotten cheaper. According to Reutersthis has been a financial triumph: shares of companies such as Ningxia Baofeng Energy, which produces millions of tons of chemicals from coal, have risen 30% since the start of the conflict, while traditional Asian refiners such as Rongsheng Petrochemical have lost up to 27% of their stock market value. Furthermore, the Chinese media analyzed by Carbon Brief They insist on a unanimous nationalist message: in the face of a real emergency, coal is the only resource that the nation truly controls, acting as the great “ballast” guarantor of its national security. A change to other sectors. The change is undeniable. As revealed Bloombergthe country’s main coal miner, China Shenhua Energy, has cut its overall budget by 16%, but has almost doubled its investment in coal-to-chemical conversion, from 2.5 billion to 4.1 billion yuan by 2026. But at a devouring pace, as The New York Times provides information that measures the phenomenon: in 2020, China used 155 million tons of coal to manufacture chemicals; by 2024, the figure jumped to 276 million, and in 2025 it grew another 15%, single-handedly exceeding the total annual coal consumption of the entire United States. The research center CREATE confirms this trend in its reportconfirming that the use of coal in the chemical industry grew by 20% year-on-year only in the first half of 2025. Added to this is that, as the American media explains80% of Chinese nitrogen fertilizer (a third of the world’s supply) is already made with coal rather than oil or gas, allowing Beijing to keep its product at less than half the global market price. Behind it there is a very high cost. All this bold industrial maneuver has a severe climate cost that is already setting off international alarms. China’s draft 15th Five-Year Plan (2026-2030) has set extremely cautious climate goals. As the experts explain CREATE and collect Financial Timesthe set goal of reducing carbon intensity by only 17% is “disappointing” and leaves room for the country’s emissions to continue growing between 3% and 6% in real terms over the next five years. This new government plan de facto reverses the international promise to “phase down” coal consumption, replacing it with a consumption “plateau” and explicitly protecting the large-scale expansion of the coal-based petrochemical industry. Only chemical projects already planned to be built between now and 2029 could increase China’s annual carbon dioxide emissions by an additional 2%. The forecasts are resounding. According to Bloomberg, By 2030, China’s chemical roadmap will massively stop using oil as a primary fuel (thanks to the adoption of its electric vehicles) and will take advantage of its modernized facilities to seek 85% self-sufficiency in all advanced materials and chemicals, displacing traditional giants. A feared crisis of overcapacity. The European ideas laboratory MERICS warns of collateral consequences: The Chinese domestic economy, with consumer confidence stagnant since the pandemic, has no way to absorb all this gigantic new production of materials and plastics. As a direct result, Chinese factories are forced to export their immense surpluses to the rest of the world at fire sale prices. This aggressive price war propelled China’s trade surplus to a stratospheric record of $1.2 trillion in 2025. According to the complaint MERICSthese massive exports are cannibalizing the industrial base of other nations; In the European Union alone, up to 500 manufacturing jobs are being lost daily due to the total … Read more

the main ingredient is the plastic of the shampoo bottle

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We have been wanting for years retire to traditional brick. This piece that has been the pivot on which civilizations have been built has ended up becoming a headache. The same thing happens to us with him concrete: It’s easy, cheap, but very polluting. That is why there are universities, organizations and even agencies like DARPA investigating to find alternatives. A young woman in Kenya believes she has found -another- solution: plastic. And it is a very interesting 2×1. plastic bricks. Nzambi Matee is a young Kenyan materials engineer who founded her company Gjenge Makers with one goal: turning the numerous plastic waste into bricks. Whoever says bricks says any urban element such as paving stones, tiles or manhole covers. The idea is to address the plastic waste crisis in Nairobi while trying to provide a solution to the need for eaffordable building supplies. And, also, giving work to women and young people belonging to vulnerable communities. The process. To create these plastic bricks, Matee was experimenting with different formulas until he found one that achieved the right properties. To do this, it mixes the plastic with sand into a whole that is heated and compressed to form solid blocks. With the right proportions, they calculate that the plastic bricks are five times more resistant than traditional ones. When that step has been completed, the mixture is introduced into an extruder where it is heated, with the plastic reaching the melting point, but without chemically degrading. The material is then poured into molds and a hydraulic press compacts to achieve both a high density and the desired shape. When it cools, it is removed from the mold and we now have a batch of bricks. Properties. The result is a material that, according to those responsible, has good thermal resistance as it has a melting point of more than 350 degrees. For paving streets in Nairobi, this is an important detail because it ensures that it will maintain its shape under normal use. They also do not crack as “easily” as a conventional brick while maintaining some flexibility. What uses? Well…anyone that involves the use of a traditional brick. Apart from the cases mentioned, you can also pave sidewalks, patios, parking lots or as decoration, since they can be designed in various colors. Tackling the plastic problem. Many times we have echoed the so-called ‘neobridrillos’. There are a lot of materials, plastic being a common component to address the recycling problembut There are also cane ones, for example. And we always say the same thing: they are interesting, but they cannot be used because they are not approved. The difference is that the Kenya Bureau of Standards is responsible for legitimizing use for urban and residential projects in the country, and Gjenge Makers’ plastic bricks have obtained permits. Examples of use The plastics they use are also those that can be left out of the recycling circuit. Kenya, with 95% of its waste recyclable, but where only 5% are recycled, it is not the most committed country in the world in this sense (in fact, it is one of the great pending tasks of the planet). And the plastics used are common: HDPE -high-density polyethylene-, LDPE -low-density polyethylene- and PP -polypropylene-. They are widely present in shopping bags, wrappers, detergent bottles, ropes, buckets and many other containers that simply end up in traditional trash. According to the startup’s numbers, since the start of the project in 2020, 200 tons of plastic waste have been used to convert it into construction material. Beyond the brick. But something that we also often say is that it is one thing for the invention to be ready and work… and quite another for it to be consolidated as a new construction material. Because other elements such as the cost per unit or the economic interests of the traditional industry come into play there. And something that is also important is the social impact of the company. According to its website, it provides direct and indirect employment to more than 600 people. They are linked to the collection, classification and manufacturing of the product, and a large part of the workforce is women and young people who find it difficult to participate in other economic activities. In the end, it is a project that is located at the intersection between the circular economy, sustainable urbanism and social inclusion. And it is a nice program, but as we say, there are more and more sustainable bricks, but in the end we continue to choose the most polluting process. Images | Gjenge Makers In Xataka | We have just reinvented the brick. It is just as it was millennia ago

the dangerous TikTok trend of chewing food with plastic that camouflages an eating disorder

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Eating something that we love very much, but without adding a single calorie to the diet, seems like something that resembles a true miracle, but the reality is that in China social networks are being flooded with a method that promises this. And we are not dealing with something revolutionary to trick the brain, but rather eating food wrapped in plastic. Something that has been baptized like ‘plastic eating’ as El País has reported. How it started. This trend has been with us for a short time, and the origin is in Douyin, the Chinese version of TikTok. Here the videos showed young people placing a piece of plastic wrap over your mouth or wrapping food in plastic and then chewing and spitting it out. The goal here is to taste high-calorie foods without swallowing them so as not to gain weight. Extended. The algorithm worked its usual magic, and the trend has quickly spread to other countries, even reaching TikTok, where this new challenge has been replicated. And when you start with this trigger in a new population, logically you have to take into account the risks of replicating it and turning it into something viral. Especially focused on adolescents, who may be more vulnerable in these situations. Its consequence. Beyond how bizarre it is to put plastic in your mouth to enjoy the flavor, but not have the effect of the calories, the more immediate physical damage must be considered. One of the most striking, related to repeatedly chewing a packaging that has not been designed for human consumption, carries a very high risk of suffocation and also dental damage. But we must not forget that we are chewing plastic here, so there is a risk of ingesting toxins. Different medical and scientific sources warn that these practices can expose us to the consumption of microplastics, which we have already been able to talk a lot about, as they are present in some important organs such as the placenta or testicles. Something that little by little is being related to hormonal disruption. Psychological risks. Without a doubt, it is another of the most important risks that we must take into account here, since what the networks sell as a trick to reduce the cravings we have throughout the day, is actually a classic symptom of eating disorders or eating disorders. In the clinical setting, it is known as ‘chewing and spitting’, which is a very common compensatory behavior in the diagnosis of anorexia and bulimia. It is not a new idea, since the iconic designer Karl Lagerfeld popularized and defended publicly this technique years ago after losing between 30 and 40 kilos. However, science denies that it has real benefits, since different studies suggest that when we chew food, the body prepares for digestion and increases the levels of ghrelin, which is the hunger hormone. But in reality, by not receiving food, hunger and anxiety are triggered, causing a severe loss of control, metabolic alterations and malnutrition. Social networks. The proliferation of these types of trends puts the role of social networks in the mental health of young people back on the table. Scientific data provided by recent studies indicate, for example, that exposure to content that promotes anorexia on TikTok significantly decreases body satisfaction in a matter of minutes, increasing the internalization of “thin ideals.” It has also been proven that 73% of young users with moderate or high risk of suffering from an ED show symptoms directly related to their interaction on TikTok. Images | Clown World In Xataka | We believed that extreme thinness was a fashion that had happily been overcome. What is happening on networks contradicts us

Texas has the same problem of sinkholes and potholes as Spain but believes it has the solution: plastic roads

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It is barely one kilometer but the promise is enormous: converting the roads into a huge plastic recycling plant. Testing began at the University of Texas at Arlington (United States) promulgated by Sahadat Hossaincivil engineer and director of the Solid Waste Institute for Sustainability at the University of Texas, but they have already taken the leap to the road. Hossain tells the story in The Conversationwhere he explains that the project was born from his obsession with recycling plastic. The engineer points out that he grew up in a low-income neighborhood of Bangladesh and that there he observed that people who lived closer to the landfills suffered more health problems than those who lived a little further away. His childhood experience has focused much of his research, focusing on the impact of materials on the environment and possible solutions for recycling them. Among the most complicated to recycle and, without a doubt, the most used: plastic. Now, under their research, in the United States they have launched a project to use plastics used in the construction of roads. And the results are being successful. Harder and more resistant In Texas they have a problem: it’s hot. Very hot, in fact. When building a road, taking the climate into account is essential. ANDIn warmer places, harder bitumens are needed. because they tolerate heat better. The problem is that asphalt also becomes more fragile and breaks more easily. The problems are even more pronounced if a wave of bad weather with a lot of water hits a fragile pavement, as has happened in Spain. A solution could go through make the asphalt a little more elastic but this has an intrinsic problem. And if the asphalt is more elastic, it also resists heat less well and in the harshest months it can soften and melt, as has happened to the United Kingdom in recent years. But this is, always, if we use traditional methods. What Sahadat Hossain’s team is testing is injecting plastics into the bitumen that binds the mixture of stones and sand that makes up the asphalt. At the moment, they are trying to inject plastics that make up between 8 and 10% of the bitumen mixture that binds the rest of the materials. It may not seem like a lot but, according to Hossain, at a test site near Dallas they used 4.5 tons of plastics that came from single-use plastic bags or bottles that were discarded to build a mile. It is a not insignificant amount if we think that we are talking about building about 1,600 meters of road while giving a new use to a material that produces about 400 million tons a year and of which barely 10% is recycled. To be useful, the process requires shred plastic until you get a very fine material that can melt with the bitumen and thus not leave elements in the air. And the result is being good. The first tests were done in university parking lot but they have already been scaling the project to roads with intense road traffic. According to their experience, the asphalt continues to resist heat (with good performance on days that exceeded 100º Fahrenheit, almost 38ºC) and is more flexible than with the traditional system, which reduces the risk of cracks and fractures. Point at The Conversationthat one of these tests has also been carried out in Bangladesh, where a heat wave caused more cracks and fractures in traditional roads while this road with plastics suffered much less wear. It is, therefore, good news when it comes to extend the useful life of the pavement and save money on maintenance. The good news is that the project is monitoring all the results with high traffic volume roads (also the adverse ones such as the possible emission of microplastics when vehicles pass by). And this test is by no means the first. In Rotterdam there was already talk of building these roads with recycled plastics a decade ago. However, its fatigue is much lower. The advantage here is that its performance can be studied under constant and high-tonnage traffic. Photo | The University of Texas at Arlington In Xataka | Until 2020, Spain had the most praised roads in Europe. Now it has something else: a hole of 13,000 million euros

This new biodegradable material is much more than a simple substitute for plastic

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He used oil that we generate in the kitchen it seems that has no more life than end up discarded, but the reality is very different. The Holy Grail, right now of modern materials science, is to get rid of the oil dependencebut also solve the problem of the waste we already generate. And this is something that has become evident with fryer oil, which now has a new function: being an adhesive. A progress. A team from the University of South Carolina has killed two birds with one stone with a surprising solution: transform the fryer oil into a material that imitates polyethylenebut it is biodegradable and adhesive. But this adhesive is so strong that it has even managed to tow a car using only two steel plates joined with this material. The oil problem. The plastic we use in our daily lives is polyethylene, which is cheap, flexible and resistant. But it has a serious problem: it is of fossil origin and with how difficult its degradation is makes it contribute to global pollution. On the other hand, we have used cooking oil. It is estimated that we generate about 3.8 billion liters per year worldwideand although it is used to produce biodiesel or lubricant, converting it into high-performance thermoplastics was a barely explored field due to the complexity of its chemical composition. Breaking down the fat. What the team led by Chuanbing Tang and Olga Kuksenok has achieved It is not simply “recycling” the oilbut to deconstruct it and reassemble it at the molecular level. And this is something fundamental, since you can take advantage of both the fatty acids and the glycerol that are part of this fat. By polymerizing these components, they created aliphatic polyesters that almost perfectly imitate the mechanical properties of low-density polyethylene (LDPE), the plastic we commonly use in bags and packaging. A new material. The surprise came when the result of this experiment did not generate a traditional polyethylene that is inert, but rather this new material derived from oil has chemical groups that can act as molecular ‘hooks’. That is, it can stick like glue. The research wanted to demonstrate its adhesive capacity on different surfaces such as stainless steel, copper, wood or cardboard. And the results were surprising, since in cut resistance tests it surpassed other renowned commercial adhesives, and could even be used as a silicone gun to seal boxes. Moving a car. Without a doubt this is the litmus test that wanted to demonstrate that used oil has great strength behind it. To do this, they joined two steel plates with this polymer and used them to pull a four-door sedan uphill. The union in this case held without any problem. The importance. This is a big step towards the circular economy. We are not just talking about making a “less bad” plastic, but about creating new materials with high added value, such as their ability to glue the waste we have in the kitchen. And in many things it can be difficult to recycle. Imagine a future where the oil from today’s French fries becomes the bumper on your car or the sticker on your next Amazon package, only to be processed again without ending up in a landfill. This is precisely what science is trying to achieve to increase recycling strategies and dependence on fossil resources. Images | Zoshua Colah Scott Sanker In Xataka | We have been thinking for decades that plastic recycling was worth something. Maybe we were wrong

We have been hearing for years that plastic is safer than wood. Jordi Cruz does not agree (and it seems he is right)

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Science has spent decades studying what happens with E.colithe Salmonella and company when they touch the wooden, plastic or metal boards that we use in the kitchen. It is an old (and we thought unsolvable) fight, but the famous chef Jordi Cruz has spoken. He said it on TikTokbut since the ways of distributing content on the Internet are capricious, he has also said so in tens of websites. The question is whether what he said makes sense. What does Jordi Cruz defend? In essence, Cruz has commented your prints on three cutting board materials (plastic, metal and wood). Furthermore, it has gotten wet: for him, the best option is wood. As explainedwhile plastic is filled with grooves where bacteria accumulate and metal destroys the edge of the knife, wood has “natural antibacterial and antimicrobial” properties, where bacteria “get between the fibers and end up dying.” The controversy has been enormous, of course. A curious debate. That “clear” comes from the fact that for years it has been said that wood is the material that “accumulates the most bacteria”, in contrast to “non-porous” plastics that can be put in the dishwasher (and can be cleaned more easily). It is logical that seeing a famous chef say that wood is the best has made many put your hands on your head. However, Cruz is not as off track as we might think. What the evidence says. From the very beginning (the pioneering studies by Dean Cliver at the University of Wisconsin in the 90s), research they have been giving us back the same image: There is no evidence that plastic is inherently safer than wood. Appropriate (hard and closed-pore) and well-preserved wood creates a hostile environment for many bacteria. The problem is that. Wooden boards are not only more expensive, but require maintenance. And if we are not going to give it to them, plastic with all its problems is safer. Although not totally sure, of course. That is to say: the most dangerous boards are the old, scratched and poorly washed ones. The material does not matter, what is important is its state of conservation. And then? Some time ago, food safety experts stopped focusing on the material and began to look for strategies that would try to reduce the main risk derived from the tables: cross contamination. A good example of this are the recommendations of the North American USDA. For the Agency, both wood and other “non-porous” surfaces are acceptable for things like meat and chicken. Their main recommendation is another: use a table for raw meats and a different one for ready-to-eat foods (in addition to always cleaning them with hot water and soap; and subjecting them to periodic disinfection). In Europe the recommendation is similar and, in fact, he adds that although there may be more or less appropriate materials depending on the use, “in domestic kitchens the priority is hygiene and not the specific material.” What do the chefs say? What Jordi Cruz says (that a wooden board is best as a “main board”) is a general consensus between chefs and gastronomic influencers. However, it is common to restrict them to chopping cooked vegetables, fruit, bread and produce. On the other hand, also it is common to use plastic with meat and raw fish. Or what is the same, for “dirty uses.” Sometimes we get stuck in absurd debates. And this is a good example: the public debate has dedicated a lot of effort to establishing the idea of ​​”bad wood/good plastic”, when the important thing is to use several boards, assign them fixed uses and clean (and replace them) when necessary. Image | Garden House | The Anthill In Xataka | To the question of whether ultra-processed foods are as bad as we have been told, science still has no clear answer

Halloween is coming and the temptation is to put on some terrifying plastic contact lenses. Science has its reservations

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Costumes, scares, moviespassages of terror and also the occasional party is undoubtedly something that we will see in this Halloween nightalthough among all these elements there is a protagonist that can undoubtedly become a risk to our health: colored cosmetic contact lenses. The color of the eyes. To dress up in the most faithful way to the character we want to resemble, eye color may be essential. In the case of Halloween, it may be interesting to have them red or some other color that conveys a feeling of fear, such as those of the famous ‘Valak’ or ‘The Nun‘. But it can undoubtedly be a serious problem for our health. And on many occasions we want something that is economical to be able to dress up and we can choose to buy these contact lenses in a store that is not specialized in these products such as a bazaar. All because to wear it for a while at night you are not going to invest a large amount of money in a special contact lens. But we forget that we are buying a product that will be in contact with our eyes, which are really delicate. Doubts. Ophthalmologist Damián Teillard through his TikTok account It alerts us to all the problems that can arise, such as infections, corneal abrasions, blurred vision or eye fatigue when colored contact lenses are used without adaptation, with poor hygiene or throughout the night. That is why you are committed to making the purchase at an authorized optician to try them the days before. The scientific evidence. But beyond what this ophthalmologist says, we also find a large amount of scientific literature that documents all of these problems. An exampleor we have in the magazine eye that reviews these cosmetic contact lenses and demonstrates the appearance of severe microbial keratitis associated with these products that are purchased without health control. More cases. We have another example in the TFOS report on the impact of contact lenses on the ocular surface, details that their inappropriate use (sleeping with them for example) damages the epithelium, alters the tear film and increases the risk of infection. Something quite common in a situation where many people opt for these contact lenses without having ever worn this product before, so they lack the recommendations to avoid problems when wearing them. In this way, the evidence on periocular cosmetics and ocular surface underlines that makeup and formulations around the eye They can irritate, destabilize the tears and increase discomfort if combined with contact lenses. Elevation of risk. With all this, we can see how buying contact lenses in bazaars or unauthorized websites that have poor quality produces a significant injury that can end in visual loss in the most severe cases. Among these complications we see the keratitis, conjunctivitis or corneal abrasions and ulcers that require ophthalmological treatment in many emergency cases. How to use it correctly. In order to avoid all these problems, the crucial thing is to purchase them from authorized opticians and with the advice of ophthalmological professionals. But you must also follow the basic recommendations for contact lenses, such as sleeping with them, putting them on with clean hands, not sharing them with several people, and always applying makeup after putting on the lenses and removing makeup with them to protect the ocular surface. With all this you can achieve a night of terror but without the eye ending up suffering from the misuse of contact lenses that we find in any bazaar or on the internet. Images | Grégoire Hervé-Bazin In Xataka | There is nothing that makes blue eyes blue. If we want to understand why, we have to turn to physics

We have a big problem with plastic. This caterpillar can help us devouring a bag in 24 hours

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The global plastic crisis, a problem that It takes centuries to degradeI could find an unexpected ally in the world of insects. A team of scientists He has revealed how the caterpillars of the wax worm (Galleria Mellonella) are able to devour and metabolize polyethylene, The most common plastic in the worldat an amazing speed. However, they have a deadly cost for them. A decomposition that is not perfect. The investigation, presented at the Annual Conference of the Experimental Biology Societyreveals that these caterpillars, nicknamed “plastivorous”, not only chew the plastic, but that they decompose metabolically and make it an body fat in a matter of days. The most shocking data: some 2,000 caterpillars can end a standard polyethylene bag in just 24 hours. The problem of the plastic diet. Polyethylene is the plastic that we find in purchase bags, containers and endless daily use products. His chemical resistance makes it incredibly durable and, therefore, A persistent contaminant. The finding that a living being can decompose it naturally opens a Revolutionary door for waste management. However, the solution is not as simple as let out millions of caterpillars in landfills. Dr. Bryan Cassone, professor at the University of Brandon (Canada) and project leader, explains the great inconvenience: an exclusive plastic diet is deadly for worms. “They do not survive more than a few days with a plastic diet and lose a considerable mass,” says Cassone. It is as if a human swells with fat. The process is similar to that of a human consuming excess fat: The caterpillars turn the plastic into lipids that accumulate in their adipose tissue, but without the necessary nutrients to survive. It is not the first time that this possibility is explored. Given the seriousness of this problem, science does not cease in its attempt to find a solution to disintegrate the plastic we generate. Thus, in 2022 a group of Australian researchers They verified the ability of the ‘super worms’ to devour polystyrene thanks to an enzyme they had in their metabolism. But these same wax worms, object of this study, also They were already protagonists of an investigation where the capacity they had to decompose the plastic was proven. This study has taken a step further to perfectly understand its processing system and the repercussions it can have. Towards a sustainable solution: supplements and bioengineering. Although the fact that the accumulation of fat is an obstacle to research, scientists have turned this fascinating biological process into a viable solution already a large scale for pollution and for this they point to two main roads: create a mixed diet and replicate the process in the laboratory. Create a mixed diet. Scientists are experiencing with “co-supplement”, such as sugars and other stimulants, to mix with polyethylene. The goal is to formulate a feed that not only keeps the caterpillars alive, but to optimize their ability to degrade plastic, creating a circular economy system where waste becomes food. Replicate the process in the laboratory. The second way is even more ambitious. It consists of thoroughly studying biological mechanisms and intestinal microbiome of caterpillars to identify enzymes and bacteria responsible for the decomposition of plastic. If they get it, they could replicate this process of “biodegradation” in an artificial way and industrial scale, without the need to raise insects. And right now there are a lot of daily products that have been generated thanks to the use of bacteria, fungi or enzymes. In this way, the fact of extrapolating this process to the industry can be the most intelligent to control the management of plastics. From garbage to the plate. As if solving one of the biggest environmental problems were not enough, this research could have a positive and unexpected economic impact. The massive breeding of wax worms would generate a huge amount of insect biomass. According to Dr. Cassone, these worms could become a very nutritious food source for aquaculture. In this way, a waste as problematic as plastic could be revalued to enter a new value chain, contributing to the food industry. Images | Murat i̇di̇kut Tanvi Sharma In Xataka | Our problem with microplastics is so huge that they already appear even in human testicles

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