water

50 years ago, an inventor introduced the first water engine. He was Spanish, a visionary and a complete fraud

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“Of my patent, the license for Spain is transferred free of charge to the State for the benefit of all Spaniards.” Loud and clear, this is what Arturo Estévez Varela, the inventor of the water engine and, without a doubt, a great Spaniard. At least that’s what they must have thought. NODE viewerswhich in the early years of the 1970s included the words of this man from Extremadura. “That died with my father and we haven’t bothered to move it either,” said Arturo Estévez Jr. in a report for RTVE in 2009. Perhaps due to lack of knowledge or, probably, due to having too much knowledge. Knowledge that the invention, in reality, was completely unrealizable and that the patents shown to the journalist from the public entity have no value. But who was that man in a suit who drank from a jug before filling the tank of a motorcycle with water and made it work? Behind the name of Arturo Estévez Varela there was an inventor, an enormous visionary and, why not say it, also a scammer. Before his water engine, this Extremadura native born in Valle de la Serena (a small town of just over 1,000 inhabitants in the province of Badajoz) had already devised a chicken roaster with infrared and the “wing plane”, a device that allowed rockets to be recovered. Space X in Franco’s Spain. Arturo Estévez Varela in a demonstration of his invention With four liters of water, 900 kilometers of autonomy But if Arturo, who perhaps at this point we should start calling Don Arturo, became famous for something, it was for his water engine. An invention that, according to what he said, allowed you to travel by car 900 kilometers with just four liters of water. Statements included in the press of the time. It was October 1970 and, evidently, it seemed like magic. How did good old Don Arturo get a motorcycle he was taking around Spain running? Yes, with water, but also with hydrogen. Water was only one of the pillars of his invention. The third was hydrogen. And the second, a mystery. Town to town and city to city, Don Arturo traveled throughout Spain, generating a stir as he went, capturing the attention of the press and, as we have seen, also of the NODO. What this Extremaduran inventor did not reveal was what was hidden in that substance that, together with water, allowed the combustion engine of his motorcycle to work. In theory, the water reacted with a mineral that Arturo did not want to reveal. This reaction produced hydrogen which, when burned in the combustion engine, made the motorcycle work. That is, the procedure was similar to that have tried in Toyota. It is not a motor fuel cellis a combustion engine that burns hydrogen, a much more inefficient process. If we consult different sources on the Internet, many agree that the Francoism came to order a technical report to check if what that unknown inventor said was true. Obviously, everything was left in water, yes, but borage. missing These same sources end their story at the same point. Don Arturo was tireless in making himself heard, in convincing people and strangers that his invention worked and that it was the solution to many of Spain’s problems. However, it disappears. Nothing else was heard of him and the fables begin. Since the Franco regime tried to hide the invention until the oil companies decided to silence it. It seems that the secret, however, was not so secret. In this blog They recover a large part of press clippings from the time. Shortly after making himself known and without being listened to by the Government, Don Arturo managed to get someone to trust him. That someone was José Carrera Rey, a businessman who bought half of the rights to the invention at a price of six million pesetas. It is at that moment that Don Arturo loses track of him. José Carrera Rey then discovers that he has in his hands an invention that is useless. What it doesn’t have are six million pesetas and he doesn’t have a partner either. In desperation he denounces Don Arturo but nothing is heard from Don Arturo again. Only an indictment, in 1974, for an alleged crime of fraud, managed to get Don Arturo to appear in court. However, in December 1977 the magistrates were clear: Justice matters were already going very slowly in Spain and Don Arturo had not committed any crime of fraud because he believed in his invention, so there was no type of deception. Due to the dates on which the Spanish Television report was recorded and what his son says, Don Arturo died on the border of the 80s and 90s and took his secret to the grave. A secret which, according to the scientists who have studied the case, was boron. He boron It is a chemical element that, in reaction with water, produces hydrogen that, even, can become inflamed due to the enormous heat released. Hence, Don Arturo always warned that his “secret mineral” and water had to be mixed in controlled quantities. As collected The Vanguard last summer, the water engine, therefore, is perfectly functionalbut very little useful. To obtain 5 kg of hydrogen, with which a fuel cell Toyota Mirai (more efficient than burning hydrogen) travels about 600 kilometers, 45 liters of water and 19 kg of boron are needed. The problem is, basically, the 68,000 euros that 19 kg of boron would cost, according to what was reported in the Catalan newspaper. Was it functional? Of course, but, at its side, the first liter of synthetic and emissions-neutral fuel at 2,800 euros It no longer seems so expensive to us. Image | Commons In Xataka | The 194 kilometers that changed the history of the automobile have a first and last name: Bertha Benz In Xataka | The history of the first traffic light in Spain, installed in 1926: six lights … Read more

renew Osaka water pipes

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Osaka usually appears in rankings as one of the most powerful cities in Japan outside of Tokyo. Without going any further, the “power cities” ranking of 2025 once again placed it in the lead among the country’s large cities excluding Tokyo. However, beneath this modern profile lies a much less visible problem: an aging pipeline network that requires million-dollar investments and constant planning. In recent years, the state of these infrastructures has been gaining weight in the public debate, and the country’s third largest city is no exception. The donation. In November of last year, in the midst of a technical discussion on how to face this renovation, an unexpected gesture came to the municipal body in charge of water. An individual delivered 21 kilos of gold bars with one condition: that it be used entirely to improve deteriorated pipelines. The Mainichi newspaper notes that Mayor Hideyuki Yokoyama explained at a press conference that the complex is valued at 560 million yen, around 3 million euros. “Repairing old water pipes requires a large investment. For that reason, I only have gratitude,” he said when thanking the donation, and confirmed that the City Council will respect that wish. We know (almost) nothing about the donor. Beyond the value of the gold and its destination, the identity of the person who made the donation remains unknown. The mayor explained that the person asked to remain anonymous and no information has been provided about his profile or origin. It has been made public that this is not an isolated gesture: previously he had already contributed 500,000 yen (about 2,700 euros) in cash for the water system. The actual invoice. When the official figures are analyzed, the scope of the donation takes on another dimension. As he explained to the Associated Press Eiji Kotani, head of the municipal water service, Osaka needs to renew a total of 259 kilometers of pipes. Replacing a section of just 2 kilometers represents an approximate cost of 500 million yen (about 2.7 million euros), an amount close to the full value of the ingots. In addition, it has been announced that leaks under the roads have increased in recent times. The problem is not limited to Osaka. Much of Japan’s public infrastructure was built during the rapid economic growth of the 1960s and 1970s, and today many of those networks are undergoing major renovations. BBC notes that More than 20% of the country’s water pipes have exceeded 40 years, which is the legal useful life. a real problem. That debate stopped being abstract at the end of January 2025, when a huge sinkhole opened on a road in Yashioin Saitama prefecture. The collapse engulfed a truck and triggered a complex rescue operation as teams tried to access the cabin where the 74-year-old driver was. Sewer system officials said corrosion of a pipe could have created a cavity under the asphalt and caused it to collapse. As we can see, the donation can help boost the renovation of the pipes, but it is far from solving the entire problem. Images | Jingming Pan | Juliana Barquero In Xataka | The Aztecs and Ulysses had something in common that humanity has always sought: the true secret of happiness.

The extreme stress of the Spanish water network explained from within

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The images have flooded social networks this weekend: the Aldeadávila dam “turbinating at full capacity” with the Duero river descending with enormous force, or the Iznájar reservoir recovering its splendor in a matter of days. They are hypnotic images that hide a much more tense and calculated reality. While the citizen sees natural spectacles, the engineers see a fight against the disaster. In the midst of this “festival” of storms that has shaken the peninsula this month of February, One phrase sums up the situation better than any other. It is pronounced by José María Sanz de Galdeanodirector of Hydrological Planning and Works of the Basque Water Agency (URA): “The dams were not designed for floods, but today they are key to cushioning them.” These infrastructures, designed decades ago so that water comes out when you turn on the tap or to turn on the light, have become—almost by historical accident—the last line of defense between the perfect storm and the safety of the populations downstream. A winter concentrated in a few days. To understand the magnitude of the event, we must first look at the Basque Country, where the orography and intense rains have tested the system. As explained by Sanz de Galdeano in the SER ChainEuskadi has faced a winter marked by episodes of very intense rain concentrated in very few days. The situation has forced the activation of the two major Basque regulatory systems. On the one hand, the Zadorra system composed of the Ullibarri-Gamboa reservoir and the Urrunaga dam. On the other hand, the Añarbe system is responsible for supplying the Donostialdea area. It is not a local phenomenon. It is a symptom of a broader hydrometeorological pattern that has affected the entire peninsula. While in the Tormes system, reservoirs like Santa Teresa are close to 80% and release water preventively to defend the city of SalamancaIn the south the situation has been even more drastic. In Andalusia, the Iznájar reservoir—the giant of the community— has doubled its reserves in just two weeks, going from a critical 25% to exceeding 50%, something that had not been seen in a decade. The intensity has been such that the AEMET even warned of scenarios of soil saturation with impacts “some of the highest in the world”, causing water to gush directly from the ground in places like Grazalema (Cádiz). forcing preventive evacuations. From supply to “lamination”. The relevant thing about these weeks is not only that it has rained, but how we have managed that rain. Sanz de Galdeano puts his finger on the sore: “These infrastructures were built primarily for water supply, not specifically to laminate avenues.” However, its immense storage capacity has made it possible to change its function on the fly. Dams have acted as giant shock absorbers. “They have sufficient volume to play with reserves, create space and retain water at the most critical moments,” says the director of URA. Sanz de Galdeano’s warning has scientific support. A study on the effectiveness of dams in the face of climate change confirms that infrastructure designed with “historical data” They are operating blind to the new reality. Old models did not account for this extreme variability; under severe warming scenarios, the risk of large dams overflowing could multiply by up to 17 compared to historical records. The conclusion is technical but terrifying: the effectiveness of a dam decreases dramatically under extreme hydrological regimes if adaptive management is not applied. This excess water has had an unexpected side effect on the energy market: Spain’s “battery” it’s so loaded (117% more stored hydroelectric energy than last year) that nuclear energy is no longer competitive. The Trillo plant, for example, has been disconnected from the grid because, given such an abundance of turbineable water, the numbers simply “did not add up.” Choreography of floodgates. The precision mathematics that decides how much water reaches your home. The management of these crises is a precision choreography that Sanz de Galdeano graphically defines as working “with one eye on the river and another on the sky.” The technical key lies in the “reservoir”: the empty space that is deliberately left in the reservoir before the rain arrives in order to swallow the flood. The director of URA details how it is applied this differently depending on the capacity of each system: In the Zadorra (High regulation): These dams control 60% of the upstream basin. This allows for drastic intervention. The figures from Sunday night are the best example: 260 cubic meters per second of furious water entered the system, but the floodgates only let out 54. That difference (more than 200 m³/s retained) is the flood that was avoided. In Añarbe (Less regulation): Here the dam only controls 23% of the basin. Most of the river water circulates freely, so there is less room for maneuver. Even so, the strategy is the same: when the river goes high, floodgates are closed to retain “as much as possible.” All this is done under administrative coordination complex but fluid between URA, the Ebro Hydrographic Confederation and that of the Cantabrian Sea. Not all barriers are the same. In this context of saving dams, a reasonable question arises: why then are some dams on Basque rivers being demolished? Sanz de Galdeano makes a crucial distinction between large regulatory infrastructures and small weirs. “These are not large infrastructures like those of Zadorra, but rather low-rise structures that have no real capacity to manage avenues,” he clarifies. The elimination of these small obstacles responds to two logics: Environmental: they allow fish and fauna to ascend the river, improving ecological health. Hydraulics: Although it may seem contradictory, these small walls can raise the water table in local floods, worsening the problem instead of solving it. However, large dams have their own silent enemy: sediment. Experts and organizations like Greenpeace warn that torrential rains They drag tons of mud that accumulate at the bottom of the reservoirs, subtracting their real capacity (that “hole” that Galdeano spoke of) and … Read more

a scar that “splits” the peninsula with water

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We have had 2026 going through water. Christina It brought strong winds and covered the central part of the peninsula with snow. Then, the storm Leonardo left torrential rains and strong winds in Andalusia and we didn’t finish saying goodbye to Marta and Nils is here. So much water has fallen that the state’s reservoirs store 117% more hydroelectric energy that a year ago, classes have been suspended in almost all of Andalusia and municipalities such as Grazalema have been evicted in the face of the threat of almost 600 liters of water per square meter, a figure that beats any previous record. Not only Spain has suffered the intense rain, Portugal has also taken its share: affected areas include Alcácer do Sal and the Tagus River basin, in the southern part of the country. Luis Montenegro, Prime Minister of Portugal, has declared the state of calamity in 68 municipalities until mid-February due to unprecedented rains and floods. Visually we have seen how rivers and reservoirs reached unusual heights, but from space the image of the trail left by the train of storms in the southwest of the peninsula it is also impressive. Below these lines, the radar image of the European Space Station based on data captured by Copernicus Sentinel-1 with the extension of the floods around the Tagus River and its basin. The extent of flooding around the Tagus River and its basin. THAT To create this composition, ESA has superimposed an image taken on February 7, 2026 over one taken on December 27, 2025. The area marked in red indicates how far the water level has risen in the Tagus basin and surrounding areas. This synthetic aperture radar is capable of operating even in unfavorable conditions, such as low sunlight and dense cloud cover, allowing continuous monitoring. The map that we see below shows the accumulation of rain in the Iberian Peninsula in a few days: from February 1 to February 7, 2026. For this, the European Space Station has taken the data of the Global Precipitation Measurement (GPM) missionan international network of satellites that provides global observations of rain and snow. Those areas in red indicate a record of more than 250 millimeters of rain in just one week. Accumulated rain from February 1 to 7. THAT As can be seen, North Africa, southwest Portugal, Galicia and the provinces of Málaga and Cádiz bore the brunt, which explains the situation of saturation of the land and why several hydrographic basins increased their flow significantly. By combining both systems it is possible to relate how intense the precipitation is with its physical impact and its real extension. In Xataka | Google flood risk map: so you can see if you live in an area that is at risk In Xataka | Map with the level of reservoirs: how to check their status and the dangers of river overflowing with infoAGUA Cover | European Space Agency

Sparkling water has a “secret” to losing weight. And it has nothing to do with its nutritional properties.

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Sparkling water is one of those ‘rare’ options on the drinks menu that few people consume in our environment, but little by little it is gaining popularity. prominence in the dietary field. All thanks to a recent scientific publication that pointed to its benefits in order to lose weight with its consumption, although there is quite a bit of fine print under this premise. The study. The epicenter of this new wave of enthusiasm is placed in a study published in BMJ Nutrition where a fascinating hypothesis is raised: carbon dioxide dissolved in water could increase the glycolysis in the organism. A process that basically does is ‘break’ the sugar we have in our cells to obtain energy. In this way, we would be reducing one of the components that gives rise to the ‘hated’ fat that we want to avoid. As? Drinking sparkling water and having this happen is not something very ‘normal’ a priori. Science suggests that, when consuming carbonated water, the CO₂ that gives rise to those bubbles that we see on its surface passes into the bloodstream, where it could stimulate our red blood cells so that they use more glucose and therefore, it does not accumulate as fat. On paper, it sounds like music to the ears of anyone looking to lose weight: drinking water to burn off sugar. There is small print. The study itself is a brief report and the scientific community she has been quick to qualify it: Even if the mechanism exists, the isolated effect is too small to produce “miraculous” weight loss just by drinking water. In this way, we are not facing a great ‘fat burner’, but rather a metabolic curiosity that will hardly be noticed on the scale if it is not accompanied by other changes. The real trick. If sparkling water doesn’t magically “burn” calories, why do many nutritionists insist that it helps with weight control? The answer lies not in metabolism, but in fluid mechanics and satiety. This is not something new, but studies from 2008 already showed that carbonated drinks had a direct impact on the stomach. The first effect focuses on the distention of the stomach, since the gas takes up volume. Thus, when drinking sparkling water, there is greater distension of the ‘upper’ part of the stomach compared to normal water. This makes we get full faster and we don’t want to continue eating. There is more. But beyond filling us up faster, this distension sends satiety signals to the brain through the vagus nerve. That is why the bubbles “trick” the stomach, making it believe that it is fuller than it really is. In this way, the brain interprets that it is full and inhibits our desire to continue eating. thanks to chemical inhibition. Japanese investigations on oral stimulation with CO₂ suggest that this feeling of fullness can reduce subsequent food intake, although the effect is modest and short-term. The substitution factor. The strongest argument for sparkling water has nothing to do with CO₂ or gastric motility, but rather behavior. This is precisely what I was aiming for. a meta-analysis by McGlynn which reviewed what happens when we replace sugary drinks with calorie-free options. The results in this case are quite clear: replacing cola or packaged juice with water (with or without carbonation) reduces weight, BMI and body fat. And this is where sparkling water shines as a replacement tool, since for many people accustomed to the sensory “aggressiveness” of a carbonated soft drink, flat water is boring. And its impact. Sparkling water offers that oral stimulation, with the beloved sting of bubbles, without the “toll” of empty calories. If carbonated water helps you quit sugary sodas, that is the relevant clinical impact, not the fact that carbonated water speeds up the burning of sugars we have previously consumed. It’s not for everyone. Although hydration guides indicate that sparkling water hydrates exactly the same as regular water, it is not for everyone. That same mechanism that helps satiety (gastric distension) is the number one enemy for certain clinical profiles, such as for those who have gastroesophageal reflux or irritable bowel syndrome. Here, increasing the pressure of the digestive system can aggravate these diseases. Images | Anja Michal Jarmoluk In Xataka | The myth of “two liters of water a day” collapses: a mistake from 1945 that science is now trying to correct

We have so much water in Spain’s reservoirs right now that it has become a problem for someone: nuclear power.

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What just a few months ago seemed like a chimera—seeing overflowing reservoirs in the middle of winter—has become an overwhelming reality after the passage of successive Atlantic fronts. But the water that has fallen on the peninsula has not only alleviated the drought; has generated such an excess of energy supply that the electrical system has had to do without its traditional “base load”: nuclear energy. The data confirms that, faced with the push of water and wind, the atom has lost its place in the market. A change of scenery. According to data from the Peninsular Hydrological Bulletinthe water reserve in Spain has skyrocketed to 77.3% of its total capacity, storing 43,341 hm³ of water. This represents an increase of 10.1% in a single week, a figure that illustrates the volume of rainfall. To understand the magnitude of this data, just look back: in this same week in 2025, the reserve was at 58.13%. Even more impressive is the comparison with the average of the last 10 years, which stands at 53.6%. That is, today we have 13,000 cubic hectometers more water than the historical average for the decade. The situation is such that the focus has shifted from scarcity to security. In Andalusia, where red notices have been activated, reservoirs are functioning as the last line of defense. The system has been doing “flood lamination” work (water retention to avoid floods), especially in the Guadalquivir and Genil basin, where dams such as Iznájar or El Tranco are crucial to contain the flow before it reaches cities like Seville. The great battery of Spain is full. The impact goes far beyond the visible. Reservoirs are not just liquid stores, they are giant batteries, and right now they are more charged than ever. As detailed in the Hydrological Bulletin in your energy sectionSpain currently stores 16,184 GWh of hydroelectric energy, the largest amount ever recorded at this time. If we compare this figure with the same week of the previous year (13,825 GWh), the jump is notable: today we have 117.1% of the energy we had a year ago. This massive injection of cheap electricity has saturated the seams of the Iberian market. The supply of renewable energy has been so high that interconnections have not been able to cope. According to expert Joaquín Coronado on your LinkedIn profilethe combination of rain and high wind production in Portugal caused the saturation of the interconnection between both countries. With electricity unable to flow freely, the market disengaged: while in Spain prices were sinking due to the sun and water, in Portugal they skyrocketed during peak hours due to technical restrictions. The physical network is suffering to manage such an avalanche of green electrons. The nuclear “no home”. The direct consequence of this renewable surplus is that nuclear energy is no longer competitive in this scenario. The thesis is clear: there is plenty of installed power when the weather is favorable. According to market datathe pressure from renewables has expelled 1.5 GW of nuclear power. On the one hand, Almaraz unit II had to reduce load. On the other hand, the Trillo Nuclear Power Plant was completely disconnected from the grid on Sunday, February 8. The confirmation comes from the headquarters itself. In his informative noteTrillo managers acknowledge that the plant stopped on a scheduled basis because “it was not compatible with the electricity market nor was it required by the System Operator.” Although they assure that the plant is technically perfect, they point to an economic reason: with prices sunk by storms and “high taxation”, operating the nuclear plant costs them. The underlying debate: why keep what is left over? This episode of “nuclear blackout” comes in the middle of the debate over the extension of the Almaraz plant, whose owners are requesting to extend its useful life beyond 2027. A new report from Greenpeaceprepared by the Rey Juan Carlos University and the UPC, warns that artificially keeping nuclear operational is a stopper for the ecological transition. What happened this week in Trillo reinforces his conclusions: Technical feasibility: The study ensures that in the period 2028-2029, Almaraz’s energy could be replaced by 96.4% by renewables. Economic cost: According to The Jumpextending Almaraz would cost consumers an additional 3,831 million euros and would stop green investments worth 26,129 million. Emissions: The report indicates that the extension would generate millions of tons of extra CO2 by discouraging the installation of new clean power. The market ruling. This episode is not a meteorological anecdote, it is confirmation of a change in structural cycle. The February storm has functioned as a stress test for the electrical system and the result is clear: in a marginalist market, water and wind physically displace nuclear power. The data supports that this is already a trend, not an exception. According to closing figures for 2025 published by Five Daysin Iberdrola’s generation mix in Spain, hydroelectric energy (33.3%) already surpassed nuclear energy (33.2%) in total production last year. What happened this week in Trillo is the real-time demonstration of that statistic. With Spain’s “battery” charged to 77% and the wind turbines spinning, the rigidity of the nuclear park becomes an economic barrier. The market’s conclusion is, today, unappealable: we have so much water that nuclear power is no longer essential. Image | freepik and freepik Xataka | When Spain embraced wind energy, it did not have a problem: it would be too windy.

the reality of extra autonomy is a bucket of cold water

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One of those novelties that were seen in the past CES 2026 was the technology of solar panels integrated into the body of the vehicle by the hand of Solarstica startup emerged from Hyundai Motor Group. The idea of ​​using solar energy to charge batteries is not new, but its technology is innovative and above all, His promises are most promising. (pardon the redundancy). It is in the testing phase on real models such as the IONIQ 5 and the ST1, because it is not a mere concept: they are serious. In addition, he won the prize of Vehicle Tech & Advanced Mobility. Up to 80 extra kilometers per day. Solarstic affirms that integrates solar panels on the hood and roof so that, combined, they can generate up to 500 watts of power, which can extend the range of an electric vehicle up to 50 miles per day (80 km), a more than respectable figure to cover daily trips. They also explain that for long-distance trips you can “recharge around 30% of the battery while driving.” It’s not glass. Not even a sticker. The idea goes from forgetting the classic and heavy glass of traditional panels, which takes its toll on the vehicle’s center of gravity and its aerodynamics, in favor of lightweight polymers in encapsulated form. To integrate them into structural elements (they are not mere adhesives) such as the hood or roof, injection molding is used, which allows for more complex and curved shapes. It also has its advantages in passive safety: in the event of a collision or run over, a polymer hood would absorb energy compared to a glass one, which is rigid and at risk of breaking. It hasn’t been easy. To the technical challenge of manufacturing in the form of polymer encapsulation with high pressure and the risk of solar cells breaking (which have solved with a protective layer and lowering the injection pressure) durability and aesthetics come together. Polymers exposed to the sun tend to degrade, losing transparency in favor of a yellowish tone that reduces efficiency. In addition, a simple wash could also deteriorate them and not only aesthetically: if the polymer is scratched, the light is scattered and does not reach the cell. So they are testing with anti-scratch and anti-degradation coatings. Finally, they have opted for a more discreet black finish that hides the solar cells in plain sight. Your face sounds familiar to me. The concept of using solar energy: Lightyear One and its promise of 70 km of autonomy per day. The fine print: a prohibitive cost that ended up accelerating its end to focus on the Lightyear 2 and finally, bankruptcy of the Dutch company. Sono Motors also tried it with its Sono Sionbut financing was difficult for them and they ended up canceling the car to focus on selling their panel technology to buses and trucks. Aptera seems to be able to bring the adventure to a successful conclusion: have confirmed that 2026 is the year for the first deliveries of its ultra-efficient three-wheeled solar vehicle. It’s a niche model, not an SUV. However, more established brands such as Mercedes Benz (with its Vision EQXX with sunroof or with solar paint) either Toyota and its Prius They have also tried it. It’s time to talk about numbers. Theory and practice. We are going to take a car that we know well because we have tested: the Hyundai Ioniq 5which consumes about 17 kWh per 100 km. To achieve 80 kilometers of autonomy, it would therefore be necessary to generate about 13.6 kWh. With a 500 W system (note, peak power), it would take just under 28 hours of perfect sun per day. This figure seems more plausible in a week parked in full sun than for a single day, or in an extremely efficient model like the Aptera and not in a two-ton car. Or a calculation based on the savings of auxiliary systems. This point is very interesting. In fact, never charging it could happen in a specific scenario: living in a sunny place like Cartagena (the sunniest city in Spain according to the vacation rental website Holidu with data from ‘World Weather Online’) and do about 10 kilometers a day. In Pamplona for example, taking a summer day and assuming about 5 hours of peak sun, it would be 2.5 kWh, which is enough for just under 15 kilometers. The figures fit with what we have seen before and show a reality: the car will not be able to be powered only by solar charging as we know it. Where that extra comes in handy. When we try the Vision EQXX In a couple of journeys we are talking about an increase in autonomy of 13 and 43 kilometers respectively. The second took place on a sunny day in June. And when our colleagues from Motorpasion They tested the Toyota Prius Plug In In 2021 we are talking about an extension, in the best of cases and with its capacity at 100%, of 6.1 kilometers. Its theoretical charging power was 180 W (practical, 140W). There they came to a conclusion: the solar panels will never be able to recharge the main battery up to 100%. Although boosting autonomy sounds great, we have already seen that for most people who do not live in paradise and drive more kilometers, this can be a little push that can be used to power the air conditioning or maintain the battery when parked. Of course, Hyundai has the scaling capacity that Sonos or Lightyear lacked and if they manage to make that solar module last a decade, it will be a magnificent ace in the hole. Not so much to charge the car for free, but because that extra can be used to cool the cabin without using up the main battery. In Xataka | The electric car promises that maintenance will be zero. Now it also promises affordable battery changes In Xataka | Toyota’s weapon to … Read more

with a large amount of water but no trace of polar cold

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January is going to say goodbye with great weather instability that we are already experiencing in our flesh throughout the entire Spanish territory. If we look at the weather maps for this week that begins today, the conclusion is quite unanimous. both in the AEMET as in the European ECMWF prediction model: stability has been broken. Starting today we enter a regime of humid winds accompanied by rainfall well above average on the Atlantic slopewith special impact on Galicia and the central system. Rain, a lot of rain. If we look at the forecasts on a national scale, we are facing very marked rainfall this week. And we are not talking about normal rains, but rather accumulated ones that in the northeast could exceed the usual average for these dates by 60%. Something that responds to saying goodbye to the storm Ingrid to give way to the storm Joseph that will affect Galicia above all. Galicia is one of the points where accumulations are expected to reach 90 liters per extra square meter of anomaly with peaks of up to 150 liters per square meter in orographic points. But mountain systems such as the Sierra de Gredos, the Pyrenees and the high areas of Andalusia will also receive significant amounts of water and snow due to the orographic enhancement of the southwest winds. The AEMET. In a post on his blog, The public agency points out that this week will be marked by the passage of “fronts associated with Atlantic storms, which would leave rain in most of the Peninsula and the Balearic Islands.” Likewise, it points to the great intensity that they will have in Galicia, which will undoubtedly bear the brunt throughout this week. The thermal paradox. One of the key points that highlight the predictions is in the thermometer. Anyone could imagine very low temperatures accompanying this amount of precipitation that is expected, but the reality is very different, since we are not facing a polar cold wave. The models indicate in this case that since the winds come from the Atlantic, the air arrives warm and loaded with humidity. This will keep temperatures above the climatic measurement as the maximum temperatures will be between 10 and 16ºC, while the minimum temperatures will remain between 8ºC and 12ºC, avoiding severe frosts in low areas. The snow. In this sense we can rest assured, since according to the AEMET, the snow will be limited mainly to the mountain systems of the peninsula. However, we must be attentive to Wednesday, January 28 and Thursday, January 29, since a specific drop in elevation after the passage of a cold front could leave snowfall in areas of the northern plateau and medium-low elevations, although it will be a transitory episode within a generally mild environment. Why does this happen? To understand this carousel of storms you have to look at the index of the North Atlantic Oscillation (NAO). Currently, it is in a negative phase, which means that the Azores anticyclone weakens or shifts, allowing storms to circulate at lower latitudes (i.e. over Spain) instead of deviating towards northern Europe. Images | AEMET In Xataka | We have always believed that London is very rainy and that Barcelona is not. The only problem is that it’s a lie

We have been telling ourselves since 1945 that we should drink “two liters of water a day.” Science is clear that this is not the case.

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One of the most popular rules in popular health culturewithout a doubt it is in the amount of water you have to drink per day. An amount that is located in eight glasses a day or what is the same: the immovable figure of two literss. We see it in fitness applications, in influencers’ advice and we hear it repeated like a mantra, but the reality is that there is quite a myth behind this. We are different people. A very common phrase within medicine is precisely “there are no equal people”, and not only because of the external physique, but because of everything that is inside. This forces the medicine Focus towards a more individualized idea in your medical advice that have to be given, included in nutrition or water consumption. This forces us to have to personalize the amount of water that each person should consume, because a person who is 2 meters tall and weighs 100 kg with a large amount of muscle is not the same as an elderly person who has a much slower metabolism. Logically, the two liters of water mantra cannot be established here. The origin of the error. To understand why we drink (or think we should drink) so much, you have to travel back to 1945. According to key review by Dr. Heinz Valtin in it American Journal of Physiology 2002, the myth of the “8×8” rule, that is, 8 8-ounce glasses to have almost 2 liters of water, probably comes from a misinterpretation of a guide from the Food and Nutrition Board. A guide that indicated that it was always recommended to have an adequate intake of 2.5 liters of fluids per day. But most people ignored the accompanying sentence that said, “most of this amount is in prepared foods.” What the institutions say. So the question is quite clear: how much should we drink per day? In this case there are different official figures, but they have fine print. We have one of the examples in the European Food Safety Authority Panel 2010 established adequate water intake at 2 liters per day for women and 2.5 liters per day for men. But here’s the key: the EFSA specifies that this refers to total water, that is, the sum of drinks plus food. And there are many dishes that have a large amount of water, such as soup, although fruits also have a lot of water inside. Even in the United States. If we move to the recommendations made in the Institute of Medicine (IOM) of the USA from 2005, suggests that the total water figures should be 2.7 liters per day for women and 3.7 liters per day for men. But again, it includes all the dietary intake that is made per day and not just glasses of tap water. The latest science. If we come more to the present, we also have scientific studies that have sought to dismantle a universal fixed figure set at two liters per day. One of the most important is the one published in Science in 2022 that used isotopes to measure water exchange in 5,604 people, and that showed that real needs vary enormously between people. One of the conclusions they addressed was that for most people in temperate climates and with sedentary lives, the real water intake needs are between 1.5 and 1.8 liters per day, far from the demands of wellness marketing. And it is reinforced. It is not a study that is isolated, but also in 2022 the magazine Scientific Reports, published research where this idea was reinforced: they predict necessary beverage intakes of about 1.6 L for women and 2.0 L for men, always depending on factors such as age, sex and body composition. Is more water better? One of the most repeated arguments by proponents of hyperhydration is that we should drink “before we are thirsty.” modern physiology, backed by scientific reviews and analysis of urinary osmolarity, refutes this fear that we may have. Specifically, the human body has an extremely sensitive osmoregulation system. When the concentration of solutes in the blood increases by only 2%well below clinical dehydration, the brain already activates the sensation of being thirsty and releases the necessary hormone to begin conserving water so that it does not ‘leave’ in the urine. There are exceptions. Unless you are an elderly person (whose thirst sensation is attenuated) or a high-performance athlete in the midst of intense effort, drinking when thirsty is the most accurate and scientifically validated strategy for maintaining water balance. When you should drink more water. That the “mandatory two liters” are a myth does not mean that water is not logically vital. The most recent systematic reviews and other clinical means confirm that increasing water intake has clear therapeutic benefits in very specific cases that are not universal. These can be the following: Having a kidney stone: here the “more, the better” applies since increasing urinary flow is key to preventing the recurrence of this disease. Urinary infections: a problem that mainly affects women, and that requires ‘overhydration’ to reduce risk of new episodes. Weight loss: Although the evidence is mixed, drinking water may help with satiety and, marginally, energy expenditure. Although it is not a magic solution against obesity. More common sense. The obsession with two liters is a perfect example of how an old and misinterpreted scientific recommendation becomes a cultural dogma. The reality, supported by decades of studies from Valtin to the latest isotopic analyses, is that we are not machines that need a fixed tank filling every 24 hours. In this way, our body’s water needs are dynamic. Water needs are dynamic. If you eat a lot of fruits and vegetables, work in an air-conditioned office, and don’t run marathons every day, forcing yourself to drink 2 liters of extra water will probably only do one thing: interrupting your work to go to the bathroom more times. The situation. In this way we can understand that … Read more

The water from the Tagus is going to stay in Castilla-La Mancha. So Alicante and Murcia already have a plan B: set up desalination plants

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Water management in the Spanish Levant is not only a question of engineering, but a political and territorial battle that is released in each cubic hectometer. While the reservoirs at the head of the Tagus fluctuate and the rules of the game change in the Madrid officesthe Segura Basin tries to shield its survival through technology. With the Tajo-Segura Transfer in the regulatory spotlightthe Government has been forced to accelerate its “plan B”: converting sea water into the lungs of European agriculture. Green light to the preliminary projects. The Segura Hydrographic Confederation (CHS) already has on the table the design of the two desalination plants that promise to give a break to the Cuenca Plan. Mario Urrea, at the head of the organization, has signed the contracts to draw up the preliminary projects for works that will cost 1.34 million euros in the technical phase alone. However, the plan has already collided with local political reality. According to local mediathe exact location of the plant planned for the left bank (Torrevieja area) is a point of friction: the Torrevieja City Council and the Generalitat Valenciana have already expressed a “frontal rejection” of the possibility of the new plant being installed in said municipal area. To avoid this premature shock, the CHS refers generically to the “surroundings of the La Pedrera reservoir”, although technically the most viable thing would be to locate it next to the existing plant in Torrevieja, very close to the sea. The puzzle of numbers. The objective is to achieve water guarantee criteria, but the details reveal notable confusion in the scope of the plan. While the Government initially pointed out to a 100 hm3 plant for the Torrevieja area, the current specifications reduce that figure by half, placing it at 50 hm3. However, planning suggests that, adding the capacities of both facilities, up to 150 hm3 per year could be contributed to the system. The surgical distribution of this unconventional resource will be structured as follows: Right Bank Desalination Plant (Águilas): It will produce 50 hm3 annually. Of these, 33.5 hm3 will be used to relieve overexploited underground masses such as Alto Guadalentín and Mazarrón, while 16.5 hm3 will reinforce direct supply in Lorca, Totana and areas of Almería. Left Bank Desalination Plant (Torrevieja): With a projected production of up to 100 hm3 (according to the horizon of the basin plan), it will allocate 58.5 hm3 to alleviate the undersupply of the Cartagena and Alicante Field (Albatera, San Isidro), in addition to dedicating 41.5 hm3 to the recovery of aquifers such as Cabo Roig. A divided plan under the stigma of energy. The project has been divided into two strategic lots with an initial execution period of 12 months for its drafting. The lot on the right bank has been awarded to the company Typsa for 674,575 euros, with the mandate to study its connection with the existing desalination plant in Águilas. For its part, the lot on the left bank has been awarded to Ayesa Engineering for 669,286 euros, with the mission of connecting the infrastructure with the La Pedrera reservoir to distribute water through the post-transfer channels. A critical aspect is sustainability. Both preliminary projects must necessarily include the design of photovoltaic solar plants to reduce the high electrical cost of desalination. However, this point raises skepticism: as the local press remembersthe Government has not yet managed to materialize the solar plant in 2024 for the current Torrevieja desalination plant due to lack of location. The time factor: an insurmountable obstacle. Despite the signing of these contracts, the solution will not be immediate. The Ministry estimates that these desalination plants will take between five and six years to be operational, given that after drafting the preliminary project comes a complex phase of environmental processing, public information and possible expropriations. For irrigators, this calendar is “unaffordable”. They find themselves trapped in a temporal clamp; While climate change and the new transfer rules impose cuts today, the promised alternative will not arrive, in the best of cases, until the beginning of the next decade. Water peace or temporary truce? The commitment to desalination is the central axis of the Ministry for the Ecological Transition’s strategy to close the Segura water gap. However, with the transfer rules about to change and an execution of works that is projected into the next decade, the new desalination plants are born in a climate of technical and political uncertainty. The signature of Mario Urrea puts the paper on the table, but water—and territorial peace—still seem to be far away on the horizon. Image | CHS Segura Xataka | After the rains, the battle between communities begins: the Tagus is full and the Segura basin is already demanding its water

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