Why on earth donkeys arose has always been one of the great mysteries of natural history. Until now

When we think about the animals that have been accompanying humans since time immemorial, helping us in agricultural and daily tasks, surely the first candidates are horses, dogs, and even cats. Probably the donkeys (Equus africanus asinus) are a little further down the list. Until now we believed that the domestication of the donkey was an event that was repeated in different places and times in prehistory. However, the largest genetic study of these animals carried out to date revealed a different story: that of a single domestication of the donkey, which occurred about 7,000 years ago in the area around the Horn of Africa and what is now Kenya. The closest relatives of the domestic donkey, wild donkeys (Equus africanus) still live today in this African region. The common donkey is sometimes seen as a subspecies of these African donkeys or as an independent species closely related to it (in which case its “scientific” name would be Equus asinus). According to the team, led by French researchers, the donkey was domesticated in this context, and then began to spread throughout the rest of Eurasia, already as a domestic animal about 4,500 years ago, that is, about 2 and a half millennia after being domesticated. The genetic study has not only pointed out the unique origin of this species, but It has also “advanced” the date of domestication by about four centuries. The domestication of the donkey would have made sense in its spatiotemporal context. About 7,000 years ago the Sahara environment witnessed an aridification process that led the desert to expand. The donkeys they had an advantage Compared to other equids, they are more resistant to lack of water, which could have made them ideal for use as an aid in transportation or agricultural work. For their analysis, the international team of researchers analyzed samples of 207 modern donkeys from 31 countries, as well as remains of skeletons of 31 other donkeys who lived in the last 4,500 years. They also used genetic information from other equids to expand the study. The work of the researchers was published in the journal Science. The variety and the mules The study also offers us some curious stories about this animal. For example, genetic analysis of Roman-era remains found in France tells the story of a generation of giant donkeys (up to 25 centimeters larger than the average modern donkey). The Romans They didn’t raise these donkeys colossal for their direct use, but because mules (crosses between male donkeys and horse mares) were of great use to them. The Romans took advantage of an animal that combined part of the robustness of donkeys with the ability to travel long distances more typical of horses. After the fall of the Roman Empire, mules once again gave way to donkeys since economies had become more local, so it was not necessary to use them to transport large loads along the popular Roman road network. The donkey is perhaps the most maligned of domestic animals. Despite having played a key role in human development over the past four millennia, the donkey is often seen as synonymous with stupidity or clumsiness. Such is the point that the donkey has become a threatened species in places like Spain or Mexico. For better or worse, the donkey continues to form part of our cultural heritagefrom the donkey with which Sancho Panza accompanied Don Quixote to that of Friar Perico. Now, thanks to science, we know a little more about the history of what could be the least popular cousin of the equine family. In Xataka | The Iberian lynx is reconquering Spain and that is good news. The challenge now is to understand why In Xataka | Science had always believed that only humans understand geometry. Until we noticed the crows again Image | Ansgar Scheffold

The first telecommunications network in history arose in ancient Syria, 3,800 years before the internet

Nowadays it is difficult to think of anything other than being able to communicate with anyone instantly, no matter how far away they are. As a millennial, I have lived in the era when sending messages continuously was not common: SMS was not free and forced you to economize on language. And of course, before there were telephone calls, the reception of which today causes fear among youth. We can go back in time to the telegraph or the imperial postal networks and even the discreet carrier pigeons, which have been helping humanity communicate from the ancient Sumerian and Egyptian civilizations. A recent post from the historian and professor of history at the University of Central Florida Tiffany Earley-Spadoni published within a volume on global perspectives of warscapes brings to the fore the first telecommunications network documented both textually and archaeologically 3,800 years ago: a system of beacons to launch an SOS. The discovery. A cuneiform chart excavated at Mari, eastern Syria, dating to 1800 BC is the oldest known historical evidence of signaling using fiery beacons. But we also know what he said: an official named Bannum writes to the king while traveling to the north of the region with concern after observing the successive lighting of bonfires near Terqa and requests reinforcements. That lighting was not accidental: it was a signal of imminent danger on the border, an early warning system for possible attacks on their cities. Early-Spadoni refers to this system as a “fortified regional network,” or FRN for short. A little context. This documentation is framed within the Syrian Middle Bronze Age, a territory of cities – states in constant conflict. Taking the city meant dealing a blow to the rival and keeping its wealth, hence the siege was the star attack. But conquering a territory was much easier than administering it. Thus, these states had great ambitions, but lacked the infrastructure to govern themselves from a distance. So to better defend themselves and control the territories they used two systems: large walls surrounding the cities and a network of forts, towers and guarded roads in rural areas. This second structure is the seed of the development of empires. Why is it important. Bannum’s letter is the oldest known historical testimony of the use of an intentionally designed telecommunications network with shared infrastructure, nodes, and protocol. Do not confuse with communication methods, since smoke or drums are prehistoric and undatable. But it is also key for civilizations insofar as it allowed us to go from “presumptive states” (which conquers territories it cannot govern) to develop real and lasting territorial empires: without this infrastructure of communication and control, the size of the empires would have been simply ungovernable. How it worked. With a physical structure made up of fortresses, forts, watchtowers and wall segments and with an operation protocol. It essentially served to control routes, resupply military personnel, transmit information and track movements in the territory. The physical hierarchy of its infrastructure was distributed along roads and river crossings spaced at regular intervals of about 20 kilometers to ensure visibility between nodes. The large fortresses were the main nodes with smaller forts between them, with watchtowers for signaling to reinforce points that were difficult to see and segments of walls in strategic areas. The system operated continuously: with smoke during the day, fire at night, and had permanent reserves of wood. Each signal was known by all the nodes, so that when a beacon, the signal traveled through the nodes until it reached the center in a relatively short time. Speed ​​was its great asset and its handicap was how limited it was: it could only transmit simple messages. The early “internet”. Comparing it with the current Internet is not just a rhetorical question: FRNs share with the Internet several of its principles, such as distributed nodes, redundancy to avoid failures, protocols agreed in advance and a topology to maximize connectivity between distant points. A before and after to build empires. This system did not disappear with Mari. For more than a thousand years, each new empire that emerged in the Near East encountered these networks, recognized them as a valuable structure, and implemented them to suit their needs. The Neo-Assyrian integrated them into walled cities and in parallel developed a horse relay system for more complex and confidential messages, impossible to transmit with the original infrastructure. The Urartian Empire made them the organizing principle of an entire empire. And the Persian Empire took the model to its maximum expression with the royal road that Herodotus describes in his Histories: forts at regular intervals, relay of messages and archaeologically confirmed fire beacons in Anatolia. Earley-Spadoni’s conclusion is that without these infrastructures, the largest empires of the ancient world would not have been able to manage themselves. In Xataka | From when a monstrous telecommunications tower and its more than 4,000 cables blocked the sun from the inhabitants of Stockholm In Xataka | In 1901, a Spanish man had one of the ideas of the century: invent the remote control before television Cover | حسن and Ezra Jeffrey-Comeau

At greater depth, doubts arose

In theory, endures 15 meters underwater. In practice, we put it in the sea with a mobile of 1,000 euros inside. What happened next is just what one wants to know before buying it. On this 24/7 of the Xataka YouTube channelAmazon’s best selling aquatic housing faces real use: pressure, photos, submerged time … and background fear to run out of mobile in the middle of the holidays. Angela Blanco He has used it during his holiday in El Hierro, in full formation for the Open Water course for underwater. Between snorkeling sessions and a drop to 8 meters deep, it has tried the housing in different real scenarios: salt, pressure, photos, touch handling and long periods underwater. “It’s very easy to use, it’s a pleasure to throw photos with your mobile.” From there, the analysis focuses on the physical limits of the accessory, the usability under pressure and the tranquility it offers … or not. The assembly is intuitive. The closure can be opened with a plastic accessory, but the most natural thing is to do it with your fingers. The phone is embedded by internal tabs that must coincide with the buttons of volume if you want to wear the mechanical shot. It also includes sponge to improve adjustment on certain models. It is compatible with most market smartphones, provided they have a screen between 4.7 and 6.9 inches. When there is not too much depth, the experience is quite good. The housing allows you to shoot, check photos and move through the interface with relative ease. Of course, it is convenient to remove the air well with the valve, because if it is trapped, the flexible film that covers the screen is swelled and hinders tactile control. To snorkel or move in areas where the mobile gets wet but does not immerse itself so much, the balance between usability and security is reasonable. Where do you put the limit between comfort and protection? “I’m not so happy today, I’m going to tell you what happened.” Thus the most delicate section of the test starts. It was when the first alert signals appeared seriously. 8 meters, the screen stopped responding and the mobile was practically useless inside the housing. The pond endured, but the control of the device disappeared at the key moment. Could it have avoided whether the camera had left open from the beginning? To what extent did the pressure or the design of the case influence? In the video we tell you in detail what happened and what conclusions we take. There are contexts where this housing fits well and others where it raises more doubts. Not everything was as we expected, and that is why This 24/7 has more crumb than usual. To snorkel it is an absolute yes: easy to use, comfortable, and gives enough peace of mind. If you are considering a case like this, the video can help you decide. It is on the Xataka YouTube channel. Images | Xataka In Xataka | For years I have a “holiday mode” on my phone: that is how they do not bother me

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