The heat changes your mood. An Egyptian understood this 40 years ago and designed a town that “sweated” to cool down

The heat doesn’t just make you sweat: it also changes the way you behave. think, sleep and even relate. For decades we have responded to that problem by filling houses air conditioning. However, long before that was the solution, an Egyptian architect came to a very different conclusion: if heat alters our well-being, perhaps the first thing to change is not the machine, but the building. Thus was born an architecture that seemed to “sweat” to stay cool. The “great” discovery. The life of Hassan Fathy changed in 1941 during a visit to a small Nubian village in the Upper Nile. There he found something that modern architecture had forgotten: houses built with mud that seemed to emerge from the landscape itself and maintained a pleasant temperature even under the scorching Egyptian sun. While the rest of the world associated progress with concrete, steel and glass, Fathy began to wonder why those humble buildings managed to coexist with the climate. far better than modern buildings. Heat is a psychological problem. Fathy understood something that today science relates to heat waves: an uncomfortable home not only consumes more energy, it also affects to rest, to humor and the quality of life. His obsession was never to build spectacular buildings, but rather spaces where the air itself will work in favor of those who lived inside. To achieve recovered centuries of forgotten knowledge: interior patios, narrow streets, lattices, thick adobe walls and systems capable of moving air naturally without the need for engines. Hassan Fathy Buildings that seem to sweat. One of the most striking elements of his designs were wind catchers and evaporative cooling systems. In some buildings he carefully oriented the homes with respect to the sun and the prevailing winds to guide the air inside. In others it made that current pass on wet coal or wet surfaces, causing cooling by evaporation very similar to human sweat. Just as our body uses water to dissipate heat, Fathy’s architecture used mud, humidity and circulation of air to reduce the interior temperature without wasting electricity. Roof and dome of the Kourna Mosque seen from the minaret The modern takes another path. While Fathy advocated mud, adobe and local solutions, much of the Middle East began to copy western models designed for very different climates. From Baghdad to Benghazi, large concrete blocks, wide avenues and glass facades appeared that eliminated shadow and trapped heat. For Fathy that was a misconception: It made no sense to build buildings that first generated a thermal problem and then solved it by installing air conditioning. New Gourna City The best example: an entire city. This is how we arrive at what was his great laboratory: New Gournaa town built near Luxor during the 1940s to relocate hundreds of families. There he applied all your ideas: adobe houses, private patios, winding streets, Nubian vaults, wind collectors and spaces designed according to the path of the sun during the year. Its objective was not only to make housing cheaper for the poorest, but to demonstrate that it was possible to build entire communities. adapted to the climate and not the other way around. New Gourna The problem was never the architecture. Nueva Gourna ended up becoming one of the great paradoxes of the 20th century. Many neighbors covered the wind collectors, closed the patios and replaced the adobe vaults with reinforced concrete because that seemed “more modern” to them. The result was exactly the opposite what they were looking for: homes that are hotter in summer, colder in winter and much more dependent on mechanical systems. Fathy had anticipated it years before: when prosperity comes, the poor tend to imitate the houses of the rich, even if those houses perform worse in their own climate. The New Gourna Mosque The man who was ahead of his time. While his colleagues were building Western-inspired glass skyscrapers, Fathy was seen in Egypt as little less than like an eccentric determined to return the country to the past. However, outside its borders it began to gain recognition as a pioneer of sustainable architecture and received some of the profession’s highest international awards. As time goes by, your ideas they ended up influencing in universities, international organizations and entire generations of architects interested in bioclimatic construction. The answers from 80 years ago. Today, with cities increasingly hit by heat waves, many of the solutions that good Hassan Fathy defended are once again in the spotlight. the center of the debate architectural. Natural materials, passive ventilation, patios, lattices or wind collectors reappear in projects that seek reduce energy consumption without giving up comfort. Even UNESCO works to restore part of New Gourna and preserve its legacy. Not because it represents a historical curiosity, but because it contains a surprisingly current idea: perhaps the most intelligent building is not the one that incorporates the most technology, but the one that makes the heat never comes to become an enemy. Image | Nasrollah koohkanDimitri Papadimos, Marc Ryckaert, Marc Ryckaert In Xataka | In 1970 Japan built homes of the future where each capsule would be replaceable. Half a century later he discovered that no one knew how to repair them In Xataka | The incredible story of the tallest building on the planet that ended up becoming the largest swimming pool in the Soviet Union

If the question is how the Egyptian pyramids were made, science has an idea: hydraulic systems

Ancient Egypt is recognized for being one of the first hydraulic civilizations in history: they had control over irrigation canals, dams and transportation that was essential for erect and maintain a centralized kingdom for more than three thousand years in a fertile strip surrounded by desert. In the Old Kingdom period (c. 2700–2200 BC), the Egyptians built seven enormous pyramids representing approximately 25 million tons of rock cut, transported and fitted in less than 150 years. How they did it remains a mystery. In that period the pharaohs they ordered stone blocks to be moved at a rate equivalent to 50 tons per hour sustained for decades. There are several hypothesesbut none are satisfactory enough to explain that performance, especially at the beginning. The origin of everything is in Saqqara: the Step Pyramid of Pharaoh Djoser It is the oldest of the great pyramids and the first built entirely of carved stone. This is precisely where a multidisciplinary team proposes for the first time that water was the driving force of its construction. The hydraulic hypothesis. What the research team led by Xavier Landreau proposes is a kind of hydraulic elevator formed by three large structures from the Zoser complex. The Gisr el-Mudir functioned as a retention dam, the southern Dry Trench was the settling tank and the twin shafts (connected by a 200 meter underground tunnel) constituted the lifting mechanism: a huge float that would have raised the blocks from inside the pyramid in cycles of filling and emptying. Water from the desert wadis was channeled and filtered before reaching the vertical wells. When filled, the water buoyantly raised a platform on which the blocks rested, allowing them to be deposited on the upper levels without the need for external ramps and with less labor effort. Why is it important. Firstly, because it provides a coherent functional explanation for three structures at Saqqara whose purpose was not entirely clear. The analysis brings together hydrology, archeology and civil engineering to integrate all these elements into a unified and logical system, possibly making the Saqqara complex the oldest hydraulic infrastructure in history. If the hypothesis is confirmed, it would leave behind the hegemonic belief of ramps and a large amount of labor as a universal solution for building pyramids. A hydraulic lifting system implies efficient management of resources, energy and logistics, by significantly reducing labor. Additionally, it involves even more advanced knowledge of hydraulics. The next question is clear: are there more pyramids in Egypt built like this? Context. Saqqara is on a limestone plateau west of the Nile. How the research team mappedto the west of the complex there was a potential watershed of 400 square kilometers linked to the wadi Taflah, an ancient tributary of the Nile already documented on 18th century maps. This point is important because although today it is a desert plateau, studies of sediments from the complex itself show that during the reign of Djoser the area received intense seasonal runoffwith enough kinetic energy to deposit sediments of water origin inside the structures. In short, there was water available and in quantity. Other historical hypotheses. The most consolidated theories about the construction of the pyramids point to ramps with different geometries combined with levers and sleds. For Giza for example, Jean-Pierre Houdin proposed an interior spiral ramp. For Saqqara, studies collected in the paper itself suggest that the Dry Pit was the main limestone quarry, with short ramps on each side as a supply mechanism. As for the twin wells, the dominant interpretation until now was funerary: the royal tomb of Djoser and the abode of his ka. As for the dry grave, it was considered a quarry or had a ritual function. How have they done it. This research team has not excavated anything: it has combined satellite images of Airbus Pléiadeselevation models from the French IGN and the QGIS GIS to reconstruct the paleohydrology of the environment. From here, they generated 3D models of the complex’s internal architecture with quite popular commercial software such as SolidWorks or SketchUp. Regarding the hydraulic mechanism, they developed their own deliberately simple numerical model to estimate the water consumption and carrying capacity of the system. Yes, but. Using existing data has been both its greatest strength and also its greatest virtue, as the team recognizes. That is, although their study integrates basin topography, hydraulics and internal architecture, they have not accessed the wells or dated the sediments directly. On the other hand, from the perspective of the study of Egypt, stating that the wells are not funerary contradicts decades of consolidated interpretation. On the other hand, it raises a structural question: if those who made the first pyramids in Egypt mastered this hydraulic technology, why are the pyramids after Giza increasingly smaller and poorer? In Xataka | China’s first pipeline network is 4,000 years old and something revolutionary: it was built without the need for kings or nobles In Xataka | What we see in Petra is a city “carved in stone”: what it really hides is an amazing water system Cover | Charles J Sharp

It had been listed as “scrap” in a museum for 100 years. Now we know that it is the piece that advanced Egyptian engineering by 2,000 years.

If we think about the ancient egyptian technologythe images that come to mind are the monumental ones pyramids of giza or the great obelisks of the New Kingdom. However, the foundations of this technological feat were forged long before, as pointed out by a new archaeological study that has identified the oldest rotating metal drill in Egypt, a discovery that advances the mastery of this tool by more than two millennia and that rewrites the history of the technology in the Nile Valley. Where was it found? The story of this discovery, the truth is, could fit into a series called “Archaeological CSI”, since it all started with an identified object like a tiny piece of metal that measures just 63 millimeters and weighs 1.5 grams. This was excavated a century ago in tomb 3932 of the Badari cemetery in Upper Egypt, and had lain forgotten ever since. Literally ignored in a drawer at the Museum of Archeology and Anthropology at the University of Cambridge, was this object that caught the attention of a research team that decided to follow his trail using the most modern technology. A drill. What was initially classified as a simple and insignificant punch was actually a bow drill. This is the conclusion of this new exhaustive analysis of the piece, where they have been able to see unmistakable marks of its mechanical use such as rotational grooves, a specific curvature for tension and microscopic remains of leather rope. How it worked. What today is a drill that works connected to electricity, in ancient times, the bow drill worked by winding the string of a bow around an axle that held the drill bit. In this way, by moving the bow back and forth, the drill bit rotated at high speed. Its importance. As the researcher points out, the Egyptians had the ability to master this rotation technology more than two millennia before the first sets of drills that humanity knew today. This once again shows us how advanced it could be in its context in the art of construction. Unusual alloy. The big question here is how such an ancient tool could drill hard materials without deforming. And the answer is in chemistry. In this case, the researchers they used portable X-ray fluorescence spectrometry and saw that the drill was not made of just copper, but was an alloy of arsenic, nickel, lead and silver. A combination that is not coincidental, since the presence of arsenic gave the copper a much higher hardness, transforming the metal into a high-performance tool capable of resisting continuous friction. The trade. Beyond the mechanical value, for historians this mixture of metals is also really important because it points to strong commercial connections with the eastern Mediterranean, revealing that predynastic Egypt was not only innovating technologically, but was connected to a global network of exchange of exotic materials long before the unification of the pharaohs. The technological history. Until now, the official narrative placed the perfection of these rotating metal tools much later in the Egyptian timeline. But now, this tiny forgotten object forces us to recalibrate our understanding of human ingenuity. Images | Martin Odler Osama Elsayed In Xataka | To transport us to Ancient Egypt, researchers have been doing one thing for months: smelling mummies from 5,000 years ago

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