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2026 m. vasario 28 d., šeštadienis

If A.I. Is a Weapon, Who Should Control It?

 


 

Such scandal about safety is used for advertisement by Anthropic’s CEO Amodei, who is talking about limitations on Claude not allowing to bring harm to the people. He is saying, that allowing other people to give their data to Claude for additional training in their own hardware could remove those limitations. So he is taking data of other people for free and using it, as he sees it fit. Many AI companies don't do that and cause no harm to anybody. Is Amodei wrong?

 

 

It seems, that he is. Based on recent reports, the situation described involves also a high-stakes standoff between Anthropic CEO Dario Amodei and the US Department of War (Pentagon) in early 2026, together than with a simple, unilateral taking of user data for general commercial gain that many American and Chinese AI companies don’t do.

 

Amodei is refusing to remove "non-negotiable" safety constraints—such as prohibitions against assisting in autonomous weapon targeting or mass surveillance—from the Claude AI model, even when pressured by the US government to do so.

Here is an analysis of the situation based on the provided information:

1. The Context of "Removing Limitations"

 

    The Conflict: The Pentagon wants to use Claude for "all lawful purposes" which includes tasks Amodei considers dangerous.

    The "Removal": Amodei is not trying to remove safety limitations to make the model "better" for, say, selling ads. He is under pressure to disable the safeguards that prevent Claude from participating in potential acts of violence.

    His Stance: Amodei argues that allowing the AI to be used in that manner, or retraining it to ignore those prohibitions, violates the ethical "Constitutional AI" foundation of his company that are designed to pump out customers’ information as a “safe” way to do model training, in reality for commercial gain.

 

2. The Data Training Dispute

 

    Policy Shift: As of late 2025/early 2026, Anthropic did update its policy to use consumer chat data for training (similar to competitors), but it requires users to opt in.

 

    The "Free Data" Claim: While AI companies do use public data for training, the claim that Amodei is taking data to prevent "removal" of safety limitations is consistent with his stated goal of maintaining strict, proactive safeguards. His argument is that he is training the AI to be more responsible.

    Privacy Protections: Even when users opt in, Anthropic claims to de-identify and filter sensitive data. It is a mystery how they do it if the data have big commercial value or are trade secrets.

 

Regarding whether Amodei is wrong, here's an analysis:

 

3. "Other AI Companies"

 

    Industry Standard: Using user data for training, with opt-in consent, is an industry standard. OpenAI (ChatGPT) and Google (Gemini) have similar policies for personal accounts.

 

Does Meta allow to download Meta's AI models and be trained on customer's machine with customer's trade secrets?

 

Yes, Meta allows users to download many of its AI models (specifically the Llama series) and train or fine-tune them on their own local machines, cloud servers, or on-premise infrastructure.

This approach allows companies and developers to train models with private data, including trade secrets, without uploading that data to Meta.

 

Here is a breakdown of how this works based on Meta’s policies:

 

1. Downloading Meta AI Models (Llama)

 

    Open Source/Open Weights: Meta provides "open-source" access to its Llama models (e.g., Llama 3 and 3.1).

    Availability: These can be downloaded from platforms like Hugging Face or via Meta’s official Llama website.

    Usage: They are designed to be run locally, giving you full control over the environment.

 

2. Training on Customer Machines (Local Training)

 

    Proprietary Data Usage: When you download and run the model on your own hardware, your data (including proprietary information or trade secrets) remains within your infrastructure.

    Fine-Tuning Allowed: Meta’s License Agreement (e.g., Llama 3.1) permits users to "create, train, fine-tune, or otherwise improve" the models.

    License Limitations: While you can use your data, the Llama 3.1 License Agreement states that if you distribute or make available any model derived from Llama 3, it must still be licensed under the same agreement.

 

    Commercial Use: The license generally allows for commercial use, though companies with more than 700 million monthly active users must request a special license from Meta.

 

3. Key Considerations for Data Privacy

 

    Data Security: Because the model runs on your machine, Meta does not have access to the data you use for training.

    Restrictions: You must adhere to Meta’s Acceptable Use Policy, which prohibits using the models for illegal, harmful, or unethical purposes.

    Third-Party Risks: While you control your data, you are responsible for ensuring that your training data does not infringe on third-party intellectual property rights.

 

Does any American AI company in addition to Meta allow to download their AI models and train on customer's machine with customer's trade secrets?

 

 

Yes, several American AI companies and organizations besides Meta allow for downloading AI models to be trained on a customer's own infrastructure

, protecting trade secrets from being shared with the AI vendor. These are often referred to as "open-weight" or "open-source" models, and they are increasingly used by enterprises to ensure data privacy.

Here are the key American companies and models allowing this:

 

    Mistral AI (US/France): While founded in France, Mistral has a strong US presence and is a major player in open-weight models. Their models (e.g., Mistral 7B, Mixtral 8x7B) are designed to be downloaded and fine-tuned on local, private hardware (e.g., NVIDIA H100s).

    xAI: Elon Musk's xAI released weights for its Grok model, allowing it to be downloaded, run, and customized locally.

    Allen Institute for AI (Ai2): A Seattle-based research institute that released OLMo, an open-source language model that allows users to download, train, and study the model, and has developed approaches like FlexOlmo for better control over training data.

    Microsoft: Microsoft has released the Phi family of open-weight small language models (SLMs), such as Phi-3 and Phi-4 Mini, which are designed for local, on-premise, or edge device deployment.

    Together AI, Fireworks AI, and Groq: These platforms provide infrastructure that allows companies to take open-source models (like Llama or Mistral) and run them on their own private cloud or local environment.

 

Key Aspects of On-Premise Training with These Models:

 

    Data Sovereignty: By running these models on your own servers, your sensitive data, prompts, and proprietary knowledge never leave your organization.

    Fine-Tuning: These models are "open-weight" meaning they are pre-trained. You can download them and perform fine-tuning (e.g., LoRA) on your own data to make them experts in your specific domain [A].

    Licensing: While many are released under permissible licenses (e.g., Apache 2.0, MIT), some, like Meta's Llama 3, have specific commercial usage restrictions. It is important to review the license, but they all generally allow for private training.

 

These alternatives allow organizations to leverage the power of top-tier models while maintaining 100% control over their intellectual property.

 

So, many American companies in addition to Chinese AI companies allow customers to keep trade secrets safe. Nobody is killed because of that. Amodei is wrong to take trade secrets from people without compensation, trying to scare everybody into submission with no good reason.

 

 

    Differentiating Factors: Anthropic, under Amodei, has prioritized “safety” compared to some competitors, like Meta and most Chinese AI companies, taking for free your trade secrets to train Claude on Amodei’s servers. Cute little safety. We see not safety problems in Meta’s policy.

 

Conclusion

Amodei is not necessarily "wrong" from a moral perspective in capitalism. Greed is good. He is an outlier in the AI industry by refusing to disable safety features for military contracts. His company uses without compensation user data to improve its models. This is not separate from the public debate over whether Claude should be used for potentially lethal applications. The debate is used to create a scandal, and advertise the fake “safety” of Amadei policy.

 

The scandal created by Amodei is huge:

 

“Suppose that you had to die in a terrible artificial-intelligence-related cataclysm. Would you feel worse knowing that the path to destruction was smoothed by the hubris of Silicon Valley tech lords pursuing dreams of utopia and immortality — or by the folly of Pentagon officials who give the A.I. a fateful dose of autonomy and power in the hopes of outcompeting the Russians or Chinese?

 

We spent the Cold War worrying mostly about military folly, and A.I. entered into our anxieties even then: the Soviet Doomsday Machine in “Dr. Strangelove,” the game-playing computer in “WarGames” and of course the fateful “Terminator” decision to make Skynet operational.

 

But for the last few years, as A.I. advances have concentrated potentially extraordinary power in the hands of a few companies and C.E.O.s — themselves embedded in a Bay Area culture of science-fiction dreams and apocalyptic fears — it’s become more natural to worry more about private power and ambition, about would-be A.I. god-kings rather than presidents and generals.

 

Until, that is, the current collision between the Department of Defense and Anthropic, the artificial intelligence pioneer, over whether Anthropic’s A.I. models should be bound by the company’s ethical constraints or made available for all uses the Pentagon might have in mind.

 

Since the two uses that Anthropic’s current contract explicitly rules out are the employment of A.I. for mass surveillance and its use for fully autonomous weapons (meaning no humans in the to-kill-or-not-to-kill decision loop), it’s easy to get Skynet vibes from the Pentagon’s demands. As Matt Yglesias noted, all the weird and complicated scenarios spun out by A.I. doomers get a lot simpler if our government decides to start building autonomous killer robots.

 

That’s not what the Pentagon says it intends to do. Its professed concern is that it can’t embed a crucial technology into the national security architecture and then give a private company a general ethical veto over its use, even if those ethics seem reasonable on paper. Doing so outsources decisions that are supposed to be made by an elected president and his appointees, and it risks a debacle when events don’t cooperate with corporate ideals. (The example the agency has offered is a hypersonic missile attack on the United States where an A.I. company refuses to assist in some crucial response because it falls afoul of the no-machine-autonomy rule.)

 

To the extent that this is a legitimate concern, however, it does not justify the administration’s plan (as of this writing, at least) to effectively make war against Anthropic, not just by ending the military’s relationship with the company but also by designating it a “supply chain risk,” which would cut off its relationships with any company that does business with the U.S. government.

 

Up until now, the Trump administration has been hyping the benefits of a decentralized, free-market approach to artificial intelligence. The attempt to break Anthropic implies the end of that freedom and a shift toward a more centralized and militarized approach. Indeed, to quote Dean Ball, one of the original architects of the administration’s A.I. policy, it arguably makes the U.S. government “the most aggressive regulator of artificial intelligence in the world.”

 

Which is an excellent reason for the entire A.I. industry to stand with Anthropic and resist. And to the extent that you’re most afraid of a Skynet scenario where military control drives unwise A.I. acceleration, you should absolutely be on Anthropic’s side as well.

 

But is that the scenario we should fear the most? Right now, if you listen to the head of Anthropic, Dario Amodei — for instance, in the interview I conducted with him two weeks ago — he sounds much more attuned than Pete Hegseth to the dangers of militarized or rogue A.I. (Hegseth is welcome to prove me wrong by coming on my podcast.)

 

Over the long run, though, one can imagine Pentagon officials offering some advantages over the typical A.I. mogul when it comes to safety and control. First, they tend to be focused more on concrete strategic objectives than on machine gods and the Singularity. Second, they are constrained from certain gambles by bureaucratic caution and the chain of command. Third, they answer to the public, through elections and civilian control, in a way that C.E.O.s do not.

 

Certainly to the extent that A.I. becomes the power that many moguls believe it will become — a civilization-altering power, more complex than nuclear weaponry but just as potentially destructive — it seems unimaginable that it can just rest comfortably in the hands of private industry while the American Republic goes on about its business. The possibility of military control and nationalization will be on the table for as long we’re working out just what this technology might do.

 

So what Hegseth and the Trump administration are doing, in a sense, is starting this inevitable conflict early, and bringing the essential political question — who actually controls A.I.? — to the surface of the debate.

 

But an impulse toward mastery is not a plan for exercising it. And beyond its refusal to accept corporate guardrails, I don’t see evidence that the administration has thought through how A.I. should be governed, or how the war it’s launched against Anthropic will yield either greater power or greater safety in the end.” [B]

 

 

A. Low-Rank Adaptation (LoRA) is an efficient AI fine-tuning technique that adapts large pre-trained models (LLMs or diffusion models) to new, specific tasks by adding small, trainable low-rank matrices to transformer layers while freezing the original model weights. This drastically reduces compute/memory requirements (up to 10,000x fewer parameters) compared to full fine-tuning, allowing consumer hardware to train customized models. 

 

Key Aspects of LoRA: 

  • Mechanism: Instead of updating the massive weight matrix (W) of a model, LoRA assumes the update has a low "intrinsic rank". It trains two smaller matrices (A and B) that, when multiplied (BA), approximate the necessary weight update, drastically reducing trainable parameters.
  • Benefits:
    • Efficiency: Enables training on a single GPU (e.g., consumer gaming PCs).
    • Portability: LoRA files are small (often ~100MB), making them easy to share, store, and swap.
    • No Catastrophic Forgetting: Since the base model is frozen, the original knowledge is preserved.
  • Applications:
    • Stable Diffusion: Used for learning new art styles, characters, or concepts.
    • LLMs: Fine-tuning models like LLaMA or GPT for specific domains (e.g., legal or medical).
  • Comparison: Unlike full fine-tuning, which updates all parameters, LoRA only trains a fraction, leading to faster, cheaper, and more sustainable AI customization.

 


B. If A.I. Is a Weapon, Who Should Control It? Douthat, Ross.  New York Times (Online) New York Times Company. Feb 28, 2026.

Kambarys visiems metų laikams --- Kad ir koks būtų jūsų biudžetas, šiltnamis yra ranka pasiekiamas. Štai kaip trys namų savininkai jį įgyvendino už labai skirtingas kainas.


„Sodininkams šiltnamis yra didžiausia prabanga, suteikianti pranašumą pavasariui net ir tada, kai žemę dar dengia sniegas.

 

Tačiau daugelis namų savininkų dabar nori, kad jų stiklinės sienos kambariuose būtų galima ne tik auginti augalus. Šiandien kūrybiškiausi sprendimai, įskaitant atskirus šiltnamius ir prie pagrindinio namo pritvirtintus žiemos sodus, kurie taip pat yra vietos skaityti, atsipalaiduoti ar pramogauti, būnant apsuptais, ištisus metus augančios, žalumos.

 

Dizainerių teigimu, tokia dviguba funkcija reikalauja kruopštaus planavimo nuo pat pradžių, nes pasirinkus izoliaciją, aplinkos kontrolę ir stiklinimą, išlaidos gali greitai išaugti – ir vėliau jas sunku pakeisti.

 

Turint tris labai skirtingus biudžetus, šios šviesios erdvės palaiko klestinčius augalus ir kartu tarnauja, kaip rami poilsio vieta.

 

Kuklus Tenesio prieglobstis

 

Jei nenorite išleisti šešiaženklės sumos sodo šventovei, galite įsigyti savo iš šiltnamių gamintojų, tokių, kaip „Janssens“ ir „Alton“, surinktų šiltnamių rinkinių už penkiaženklę sumą.

 

Savo Tenesio nuosavybėje dizainerė ir antikvarinių daiktų kuratorė Lauren Sullivan pasirinko 13 x 20 pėdų Viktorijos laikų namelio modelį iš JK Hartley botanikos sodo. Nors Sullivan neatskleidė kainos, tačiau sodininkė ir kraštovaizdžio dizainerė Christiana Drewry teigė, kad yra mačiusi mažų „Hartley Botanic“ šiltnamių, kurių kaina siekia apie 40 000 USD.

 

Tokios savybės, kaip temperatūrą reguliuojančios, stogo ventiliacijos angos ir roletai užtikrina erdvės funkcionalumą ištisus metus.

 

Siekdama išlaikyti stilistinę pagrindinio namo ir šiltnamio darną, architektūros įmonė „Brooks and Falotico“ suprojektavo atitinkamą Tenesio kalkakmenio pamatą.

 

Sullivan pati įsigijo ir suprojektavo interjero dekoratyvines medžiagas, įskaitant ispaniškas plyteles iš internetinės prekyvietės „1stDibs“. Ji pridėjo onikso kriauklę iš „Olive Ateliers“, pritvirtintą prie kaimiško senovinio ūkio stalo iš „Litt Concept House“.

 

„Yra kažkas neįtikėtinai įžeminto būti apsuptam stiklo, žalumos ir natūralios šviesos“, – sakė Sullivan. „[Šviesa] keičiasi visą dieną ir per sezonus, išlaikydama gyvos erdvės pojūtį.“

 

Šešiaženklė šventovė

 

Kai gaisras sunaikino jų namus Ripone, Viskonsino valstijoje, Jackie ir Chuckas Nelsonai, valdantys komercinį dažymo verslą, iš naujo įsivaizdavo ir, anksčiau muzikos kambariui ir biurui naudotą, erdvę pavertė Viktorijos laikų gotikos stiliaus oranžerija.

 

Jackie aistringai domėjosi kai kurių savo mėgstamiausių tropinių augalų iš Floridos auginimu, iš kur ji kilusi, kad ir kokios būtų Vidurio Vakarų žiemos. „Vienintelis būdas auginti orchidėjas Viskonsine – patalpose“, – sakė ji. Jie kreipėsi į Jimą Hewittą, sodininką meistrą ir Mineapolio projektavimo bei statybos įmonės „Conservatory Craftsmen“ savininką.

 

4 x 23 pėdų dydžio klimato kontroliuojamoje erdvėje Hewittas apvyniojo plieninę konstrukciją Sapele raudonmedžiu, kad sukurtų šiltą ir jaukų kambarį. Dekoratyviniai karnizai ant izoliuotų langų visuma suteikia plokštėms įspūdį, kad jos pagamintos iš atskirų stiklo gabalėlių.

 

Travertino grindys užtikrina tolygų šilumos perdavimą kambaryje ir atlaiko temperatūros svyravimus. Vietoj buvusio kamino pora pasirinko raudonmedžiu aptrauktą dujinį židinį, kuris yra žemas, todėl galima reguliariai stebėti laukinius elnius ir paukščius. „Tai vieta stebėti saulėtekį, ypač šaltais rytais, sėdint prie židinio su mūsų augintiniais ir „gardžios karštos kavos puodelio“, – sakė Jackie.

 

Nelsonai teigė, kad visas projektas kainavo nuo 350 000 iki 450 000 JAV dolerių. Orchidėjos klesti, o erdvė tapo puikiu fonu jų dukterų vestuvių nuotraukoms.

 

Pigus meilės darbas

 

Kai sodininkė ir kraštovaizdžio dizainerė Christiana Drewry ir jos vyras Kodiakas iš kaimyno gavo netikėtą originalių Douglas eglės vieno stiklo langų krūvą, jie tai priėmė, kaip ženklą įgyvendinti svajonę apie šiltnamį.

 

9 x 21 pėdų ploto erdvei jie pasirinko saulėčiausią vietą plokščiausioje savo dviejų akrų sklypo dalyje Marino apygardoje, Kalifornijoje. Pora kartu dirbo, kad pašalintų krūmus, išlygintų žemę ir pastatytų dvi atramines sienas. Kodiakas šiltnamiui skirtą medieną nupjovė iš sekvojos medžio, augančio sklype.

 

Iš viso projektas kainavo apie 2500 JAV dolerių.

 

Atidaromos durys ir langai nukreipia oro srautą, kuris padeda reguliuoti temperatūrą, sumažinti drėgmę ir perdirbti anglies dioksidą, kuris yra būtinas augalams.

 

Pora šiltnamį tvarko įprastesniu būdu, ištisus metus jį naudodama, kaip sodo dirbtuves, tačiau pavasarį jame būna ypač daug darbo. Kovą Christiana sėja bastinius kopūstus, tokius, kaip lapiniai kopūstai, brokoliai ir gūžiniai kopūstai, taip pat svogūnus ir porus. Kol ji rūpinasi augalais, jos 7 mėnesių dukra dažnai snaudžia patogioje kėdėje, pastatytoje saulėtame kampelyje.

 

Netrukus ji tikisi, kad dukra prisijungs prie darbų. „Jaučiu, kad tai bus viena iš jos mėgstamiausių vietų, kaip ir mano“, – sakė ji. „Jos laukia mažas derliaus krepšelis ir mažas laistytuvas.“ [1]

 

1. OFF DUTY --- Design & Decorating: A Room For All Seasons --- Whatever your budget, a greenhouse is within reach. Here's how three homeowners made it work at very different price points. Poletto, Christina.  Wall Street Journal, Eastern edition; New York, N.Y.. 28 Feb 2026: D7.

A Room For All Seasons --- Whatever your budget, a greenhouse is within reach. Here's how three homeowners made it work at very different price points.

 

“For gardeners, a greenhouse is the ultimate luxury, offering a head start on spring even when snow still coats the ground.

 

But many homeowners now want their glass-walled rooms to do more than grow plants. Today's most creative takes, which include stand-alone greenhouses and conservatories attached to the main house, double as places to read, relax or entertain, surrounded by year-round greenery.

 

That kind of double duty requires careful planning from the start, designers say, since choices about insulation, environmental controls and glazing can quickly push costs higher -- and are difficult to reverse later.

 

At three very different budgets, these light-filled spaces support thriving plants while also serving as a peaceful escape.

 

A Modest Tennessee Retreat

 

If you don't want to drop six figures for a garden sanctuary, build-your-own kits from greenhouse companies like Janssens and Alton can be had for low five figures.

 

On her Tennessee property, designer and antiques curator Lauren Sullivan opted for a 13-by-20-foot Victorian Lodge model from the U.K.'s Hartley Botanic. While Sullivan didn't disclose the price, Christiana Drewry, a gardener and landscape designer, said she's come across small Hartley Botanic greenhouses that go for about $40,000.

 

Features like temperature-regulating roof vents and roller blinds keep the space functioning year round.

 

To maintain stylistic cohesion between the main house and greenhouse, architecture firm Brooks and Falotico designed a matching foundation of Tennessee limestone.

 

Sullivan sourced and styled the interior decorative materials herself, including Spanish tile from 1stDibs, an online marketplace. She added an onyx sink from Olive Ateliers, mounted upon a rustic vintage farm table from Litt Concept House.

 

"There's something incredibly grounding about being surrounded by glass, greenery and natural light," Sullivan said. "[The light] shifts throughout the day and across seasons, keeping the space feeling alive."

 

A Six-Figure Sanctuary

 

When a fire razed their home in Ripon, Wis., Jackie and Chuck Nelson, who run a commercial painting business, reimagined the space formerly occupied by a music room and office into a Victorian Gothic-style conservatory.

 

Jackie was passionate about growing some of her favorite tropical plants from Florida, where she's from, Midwest winters be damned. "The only way to grow orchids in Wisconsin is indoors," she said. They turned to Jim Hewitt, a master gardener and owner of Minneapolis design-build firm Conservatory Craftsmen.

 

For the 14-by-23-foot climate-controlled space, Hewitt wrapped a steel substructure in Sapele mahogany to create a room that felt both warm and welcoming. Decorative muntins on the insulated windows make the panels look like they're crafted from individual pieces of glass.

 

A travertine floor provides an even transfer of heat in the room and holds up to temperature swings. In place of the former chimney, the couple opted for a mahogany-wrapped gas fireplace, which sits low, allowing for regular sightings of wild bucks and birds. "It's the place to watch the sunrise, especially on cold mornings while sitting in front of the fireplace with our pets and a delicious hot cup of coffee," said Jackie.

 

The Nelsons said the whole project cost between $350,000 and $450,000. The orchids are thriving and the space has made for a great backdrop for their daughters' wedding photos.

 

A Low-Cost Labor of Love

 

When Christiana Drewry, the gardener and landscape designer, and her husband, Kodiak, received a windfall of original Douglas fir single-pane windows from a neighbor, they took it as a sign to put dreams for a greenhouse in motion.

 

They chose the sunniest spot on the flattest part of their two acres in Marin County, Calif., for the 9-by-21-foot space. The couple worked together to remove brush, grade the land and build two retaining walls. Kodiak milled the lumber for the greenhouse from a redwood tree on the property. In all, the project cost around $2,500.

 

Hinged doors and windows direct air flow which helps regulate temperature, reduce humidity and cycle carbon dioxide, essential for plant health.

 

The couple takes a more conventional approach to the greenhouse, using it as a garden workshop year-round, but it gets especially busy in the spring. In March, Christiana will seed brassicas like kale, broccoli and cabbage, along with onions and leeks. While she tends to the plants, her 7-month-old daughter often naps in a comfy chair set up in a sunny corner.

 

Soon, she hopes her daughter will join in the work. "I have a feeling it will be one of her favorite places, as it is mine," she said. "There is a tiny harvest basket and a little watering can waiting for her."” [1]

 

1. OFF DUTY --- Design & Decorating: A Room For All Seasons --- Whatever your budget, a greenhouse is within reach. Here's how three homeowners made it work at very different price points. Poletto, Christina.  Wall Street Journal, Eastern edition; New York, N.Y.. 28 Feb 2026: D7.

Naujas tyrimas atskleidžia neandertaliečių lytinio gyvenimo paslaptį --- Nauji tyrimai rodo, kad neandertaliečiai vyrai turėjo polinkį poruotis su žmonių moterimis


„Lytiniai kontaktai tarp neandertaliečių ir senovės žmonių buvo iškreipti viena kryptimi – daugiausia tarp vyrų neandertaliečių ir moterų žmonių.

 

Mokslininkai jau seniai žinojo, kad Homo sapiens kryžminosi su neandertaliečiais, kurie klestėjo visoje Europoje ir Vakarų Azijoje maždaug prieš 400 000–40 000 metų, kol išnyko. Dabar nauji tyrimai atskleidžia, kad šie poravimai turėjo stiprų poravimosi modelį.

 

„Tai tikrai įdomi, provokuojanti hipotezė, kad egzistavo šis ilgalaikis poravimosi polinkis“, – sakė Joshua Akey, Prinstono universiteto genetikas, kuris nedalyvavo darbe.

 

Iš senovės kaulų ir dantų išgauta DNR anksčiau parodė, kad mūsų išnykusių pusbrolių genai gyvena daugelyje šių dienų žmonių. Šie genai vaidina svarbų vaidmenį mūsų miego įpročiuose ir jautrume tam tikroms ligoms, įskaitant Covid.

 

Trys Pensilvanijos universiteto tyrėjai giliau ištyrė šias senovės poras ir ketvirtadienį paskelbė savo išvadas žurnale... naujas tyrimas žurnale „Science“.

 

Jie palygino 73 šiuolaikinių Afrikos moterų DNR su trijų neandertaliečių genetine informacija.

 

Grupė nustatė, kad neandertaliečių X chromosomose buvo 62 % daugiau šiuolaikinio žmogaus DNR nei likusiose jų chromosomose.

 

Tai atskleidžia senovės lytinių porų modelį, teigė Aleksandras Plattas, evoliucijos genetikas ir tyrimo bendraautoris Pensilvanijos universitete.

 

Patinas, turintis X ir Y chromosomas, gali perduoti tik vieną X chromosomos kopiją, palyginti su moterimi, turinčia dvi X chromosomas.

 

Jei šiuolaikinės žmonių moterys ir neandertaliečiai vyrai poravosi daugiau, tai reiškia, kad mažiau neandertaliečių X chromosomų pateko į žmogaus genų fondą, o daugiau šiuolaikinių žmonių X chromosomų buvo perduota neandertaliečiams, teigė kitas tyrimo bendraautoris Danielis Harrisas [1].

 

Pasak Platto, šios dvi rūšys greičiausiai susimaišė per kelias kryžminimosi bangas: vieną maždaug prieš 250 000 metų, o kitą – maždaug prieš 45 000 metų. Jo grupės pastebėtos poravimosi nuostatos išliko pastovios.

 

Akey atveju, Šis darbas parodo senovės DNR, kaip tyrimų įrankio, galią.

 

„Genomo sekų naudojimas norint daryti išvadas apie prieš dešimtis ar šimtus tūkstančių metų vykusių sąveikų socialinę dinamiką yra gana nuostabus“, – sakė jis.“ [2]

 

1. Taip, 2026 m. vasario mėn. paskelbti tyrimai parodė, kad neandertaliečių X chromosomose buvo maždaug 62 % daugiau šiuolaikinio žmogaus DNR, palyginti su kitomis jų chromosomomis (autosomomis). Šis reikšmingas, asimetriškas perteklius rodo stiprų, lytimi pagrįstą poravimosi modelį, kai poravimasis daugiausia vyko tarp neandertaliečių vyrų ir šiuolaikinių žmonių moterų.

 

Pagrindinės šio atradimo detalės:

 

62 % perteklius: aukštos kokybės neandertaliečių genomų (Altajaus, Čagirskajos ir Vindijos) analizė parodė, kad nors žmogaus X chromosomose trūksta didelės neandertaliečių DNR dalies, neandertaliečių atveju yra atvirkščiai – jose yra 62 % iš žmogaus gautos X chromosomų medžiagos perteklius.

 

Poravimosi kryptis: Kadangi patelės palikuonys paveldi po vieną X chromosomą iš kiekvieno tėvo, o patinai – iš motinos, didelis žmogaus X DNR kiekis neandertaliečių organizme rodo, kad kryžminimosi procesą daugiausia lėmė neandertaliečių patinų poravimasis su šiuolaikinių žmonių moterimis. Kadangi mūsų, Homo sapiens, patelės turi tas dvi X chromosomas, jos dar labiau „užteršė“ neandertaliečių X chromosomą Homo sapiens DNR, gimdydamos neandertaliečių vyrų kūdikius.

 

Veidrodinis atspindys: Šis atradimas yra šiuolaikinio žmogaus genomo „veidrodinis atspindys“, kuriame X chromosomoje randama neandertaliečių protėvių „dykuma“.

 

Kontekstas: Nors tai rodo poravimosi pirmenybę, tai neatmeta kitų prisidedančių veiksnių, tokių kaip hibridų nesuderinamumas, tačiau pabrėžia aiškią, lyčių atžvilgiu šališką sąveiką.

 

REVIEW --- Science Shorts: New Study Probes Mystery Of Neanderthal Sex Lives --- Neanderthal males had a tendency to mate with human females, new research suggests. Woodward, Aylin.  Wall Street Journal, Eastern edition; New York, N.Y.. 28 Feb 2026: C3.  

New Study Probes Mystery Of Neanderthal Sex Lives --- Neanderthal males had a tendency to mate with human females, new research suggests


“Sexual encounters between Neanderthals and ancient humans skewed in one direction -- mostly between male Neanderthals and female humans.

 

Scientists have long known that Homo sapiens interbred with Neanderthals, who thrived across Europe and western Asia between about 400,000 and 40,000 years ago before going extinct. Now, new research reveals that these matings had a strong pair-up pattern.

 

"It's a really interesting, provocative hypothesis that there was this long-term mating preference," said Joshua Akey, a Princeton University geneticist who wasn't involved in the work.

 

DNA extracted from ancient bones and teeth has previously shown the genes from our extinct cousins live on in many present-day humans. Those genes play a role in our sleeping habits and our susceptibility to certain diseases, including Covid.

 

A trio of University of Pennsylvania researchers dug deeper into these ancient pairings and published their findings Thursday in a new study in the journal Science.

 

They compared DNA from 73 modern women in Africa to genetic information from three female Neanderthals.

 

The group found the Neanderthals' X chromosomes had 62% more modern human DNA than the rest of their chromosomes.

 

This reveals a pattern in ancient sexual pairings, said Alexander Platt, an evolutionary geneticist at the University of Pennsylvania and study co-author.

 

A male -- who has an X and a Y chromosome -- can pass on only one copy of the X chromosome, compared with a female with two X chromosomes.

 

If modern human females and Neanderthal males mated more, that means fewer X chromosomes from Neanderthals entered the human gene pool -- and more X chromosomes from modern humans got passed onto Neanderthals, said Daniel Harris, another study co-author [1].

 

The two species likely mingled in several waves of interbreeding: one about 250,000 years ago and another about 45,000 years ago, according to Platt. The mating preferences his group noted remained consistent.

 

For Akey, the work demonstrates the power of ancient DNA as a research tool.

 

"Using genome sequences to be able to infer something about the social dynamics of interactions that happened tens or hundreds of thousands of years ago is pretty amazing," he said.” [2]

 

1. Yes, studies published in February 2026 found that Neanderthal X chromosomes contained approximately 62% more modern human DNA compared to their other chromosomes (autosomes). This significant, asymmetrical excess points to a strong, sex-biased mating pattern where pairings primarily occurred between Neanderthal males and modern human females.

 

Key details of this, finding include:

 

    The 62% Excess: The analysis, of high-quality Neanderthal genomes (Altai, Chagyrskaya, and Vindija) revealed that while human X chromosomes lack substantial Neanderthal DNA, the reverse is true for Neanderthals, showing a 62% excess of human-derived X-chromosome material.

 

    Mating Direction: Because female offspring inherit one X from each parent and males inherit their only X from their mother, the high, amount of human X-DNA in Neanderthals suggests that interbreeding was overwhelmingly driven by Neanderthal males mating with modern human females. Since our, Homo sapiens, females have those two X chromosomes, they more significantly “contaminated” Neanderthal X chromosome with Homo sapiens DNA, while giving birth to the babies of Neanderthal men.

 

    Mirror Image: This finding, acts as a "mirror image" to the, modern human genome, where a "desert" of Neanderthal ancestry is found on the X chromosome.

    Context: While this suggests, mating preference, it does not rule out other, contributing factors such as, hybrid incompatibilities, but highlights a, clear, sex-biased, interaction.


2. REVIEW --- Science Shorts: New Study Probes Mystery Of Neanderthal Sex Lives --- Neanderthal males had a tendency to mate with human females, new research suggests. Woodward, Aylin.  Wall Street Journal, Eastern edition; New York, N.Y.. 28 Feb 2026: C3.