Libro de Visitas

Chesternek

02 May 2025 - 04:15 pm

Curiosity has maintained pristine pieces of the Cumberland sample in a “doggy bag” so that the team could have the rover revisit it later, even miles away from the site where it was collected. The team developed and tested innovative methods in its lab on Earth before sending messages to the rover to try experiments on the sample.
changelly
In a quest to see whether amino acids, the building blocks of proteins, existed in the sample, the team instructed the rover to heat up the sample twice within SAM’s oven. When it measured the mass of the molecules released during heating, there weren’t any amino acids, but they found something entirely unexpected.

An intriguing detection
The team was surprised to detect small amounts of decane, undecane and dodecane, so it had to conduct a reverse experiment on Earth to determine whether these organic compounds were the remnants of the fatty acids undecanoic acid, dodecanoic acid and tridecanoic acid, respectively.

The scientists mixed undecanoic acid into a clay similar to what exists on Mars and heated it up in a way that mimicked conditions within SAM’s oven. The undecanoic acid released decane, just like what Curiosity detected.

Each fatty acid remnant detected by Curiosity was made with a long chain of 11 to 13 carbon atoms. Previous molecules detected on Mars were smaller, meaning their atomic weight was less than the molecules found in the new study, and simpler.
“It’s notable that non-biological processes typically make shorter fatty acids, with less than 12 carbons,” said study coauthor Dr. Amy Williams, associate professor of geology at the University of Florida and assistant director of the Astraeus Space Institute, in an email. “Larger and more complex molecules are likely what are required for an origin of life, if it ever occurred on Mars.”

Davidjax

02 May 2025 - 12:01 pm

While the Cumberland sample may contain longer chains of fatty acids, SAM is not designed to detect them. But SAM’s ability to spot these larger molecules suggests it could detect similar chemical signatures of past life on Mars if they’re present, Williams said.
convex finance
“Curiosity is not a life detection mission,” Freissinet said. “Curiosity is a habitability detection mission to know if all the conditions were right … for life to evolve. Having these results, it’s really at the edge of the capabilities of Curiosity, and it’s even maybe better than what we had expected from this mission.”

Before sending missions to Mars, scientists didn’t think organic molecules would be found on the red planet because of the intensity of radiation Mars has long endured, Glavin said.
Curiosity won’t return to Yellowknife Bay during its mission, but there are still pristine pieces of the Cumberland sample aboard. Next, the team wants to design a new experiment to see what it can detect. If the team can identify similar long-chain molecules, it would mark another step forward that might help researchers determine their origins, Freissinet said.

“That’s the most precious sample we have on board … waiting for us to run the perfect experiment on it,” she said. “It holds secrets, and we need to decipher the secrets.”

Briony Horgan, coinvestigator on the Perseverance rover mission and professor of planetary science at Purdue University in West Lafayette, Indiana, called the detection “a big win for the whole team.” Horgan was not involved the study.
“This detection really confirms our hopes that sediments laid down in ancient watery environments on Mars could preserve a treasure trove of organic molecules that can tell us about everything from prebiotic processes and pathways for the origin of life, to potential biosignatures from ancient organisms,” Horgan said.

Dr. Ben K.D. Pearce, assistant professor in Purdue’s department of Earth, atmospheric, and planetary sciences and leader of the Laboratory for Origins and Astrobiology Research, called the findings “arguably the most exciting organic detection to date on Mars.” Pearce did not participate in the research.

Jasondum

02 May 2025 - 11:28 am

Arctic auroras
ethena
For getting around during winter, the Inuit here nowadays prefer snowmobiles, although they still keep their sled dogs. During winter they’ll offer intrepid visitors, wrapped up warm against the deep-freeze temperatures, dog-sledding jaunts. These can last either an hour or be part of expeditions over several days, sometimes with the added experience of learning how to build an igloo. Sisimiut on the west coast and Tasilaq in the southeast are active winter centers for dog sledding.

Winter’s most stellar attraction, though, is northern lights watching. With little urban light pollution, Greenland is a dark canvas for spectacular displays, and aurora borealis-watching vacations are becoming more popular.

Staying outdoors, Greenland is developing a reputation among adventure enthusiasts: from long-distance skiing expeditions and heliskiing on the icecap to hiking the 100-mile-long Arctic Circle Trail from Kangerslussuaq, where firearms need to be carried for warning shots in case of polar bear encounters.

Life is definitely changing here. The climate crisis is eating away at its icecap and Greenland may well end up as a pawn in a game of geopolitical chess. But for now, the bright glare of international attention should shine a favorable light on one of the wildest travel destinations on Earth.

Travel writer Mark Stratton is an Arctic specialist who has traveled to Greenland six times and counting. He’s marveled at the aurora borealis, sailed to Disko Island, dog-sledded with the Inuit, and once got stuck in an icefloe.

Jasoncrome

02 May 2025 - 07:58 am

scanner.zip # **Free Subnet Scanner for Windows: Discover Vulnerabilities and Customize Your Tool** ## **Introduction** Network security is a critical aspect of IT infrastructure management. Identifying vulnerabilities within a subnet is essential for preventing cyberattacks and ensuring system integrity. A **subnet scanner** is a powerful tool that helps administrators detect open ports, active hosts, and potential security flaws. For Windows users, finding a **free and customizable subnet scanner** can be challenging. However, several open-source and free tools allow users to scan networks, detect vulnerabilities, and even modify the source code for further development. ## **Why Use a Subnet Scanner?** A subnet scanner provides the following benefits: - **Network Discovery**: Identifies all active devices within a subnet. - **Vulnerability Detection**: Scans for weak configurations, open ports, and outdated services. - **Security Auditing**: Helps in compliance checks and penetration testing. - **Customization**: Open-source tools allow developers to enhance functionality. ## **Top Free Subnet Scanners for Windows** ### **1. Nmap (Network Mapper)** **Nmap** is one of the most popular network scanning tools available. It supports Windows and offers extensive features, including: - Host discovery - Port scanning - OS and service detection - Vulnerability assessment via NSE (Nmap Scripting Engine) **Download & Development**: - **Free Download**: //nmap.org](https://nmap.org) - **Open-Source**: Can be modified and extended using Lua scripts. ### **2. Advanced IP Scanner** A lightweight yet powerful tool for scanning local networks. Features include: - Fast detection of connected devices - Remote access via RDP and SSH - Exportable scan reports **Download**: //www.advanced-ip-scanner.com](https://www.advanced-ip-scanner.com) ### **3. Angry IP Scanner** An open-source scanner that provides: - Cross-platform support (Windows, Linux, macOS) - Plug-in system for extended functionality - Export results in multiple formats (CSV, TXT, XML) **Download & Development**: - **Free Download**: //angryip.org](https://angryip.org) - **Open-Source**: Available on GitHub for customization. ### **4. SoftPerfect Network Scanner** A versatile tool with a user-friendly interface, offering: - Wake-on-LAN and remote shutdown - Detection of shared folders and weak passwords - Custom scripting support **Free Version**: //www.softperfect.com/products/networkscanner](https://www.softperfect.com/products/networkscanner) ## **How to Develop Your Own Subnet Scanner** If you want to **build a custom subnet scanner**, consider using Python with libraries like: - **Scapy** (Packet manipulation) - **Socket** (Network communication) - **Nmap Python (python-nmap)** (Integration with Nmap) ### **Example Python Script for Subnet Scanning** ```python import nmap scanner = nmap.PortScanner() target_subnet = "192.168.1.0/24" scanner.scan(hosts=target_subnet, arguments='-sn') for host in scanner.all_hosts(): print(f"Host: host is up") ``` This script performs a simple ping scan (`-sn`) to detect live hosts in a subnet. ## **Conclusion** A **free and customizable subnet scanner** is an invaluable tool for network administrators and security professionals. Tools like **Nmap, Angry IP Scanner, and Advanced IP Scanner** provide robust scanning capabilities, while open-source options allow for further development. By leveraging these tools—or even building your own—you can enhance network security, detect vulnerabilities, and maintain a secure IT environment. **Download, scan, and customize—strengthen your network defenses today!**

Lloydtaw

02 May 2025 - 07:21 am

Tesla is bringing its electric cars to oil-rich Saudi Arabia amid falling global sales
aperture finance
Tesla will start selling its electric vehicles in Saudi Arabia, entering the Gulf region’s largest economy as the company’s global sales are sliding and CEO Elon Musk courts controversy with his role in the US government.

The carmaker announced Wednesday that it would host a launch event in the kingdom on April 10, where it will showcase its EVs. Attendees will also have the chance to “experience the future of autonomous driving with Cybercab and meet Optimus, our humanoid robot, as we showcase what’s next in AI and robotics,” Tesla (TSLA) said.

Tesla may struggle to gain market share in oil-rich Saudi Arabia as EVs make up a little over 1% of all car sales in the country, according to a report by consultancy PwC published in September.
Tesla’s entry into the new market comes as the company fights battles on several fronts.

Last year, it recorded the first annual decline in sales in its history as a public company, posting a drop of 1%.

The company is facing intensifying competition in China, the world’s largest auto market. On Tuesday, BYD, a Chinese maker of electric and hybrid cars, reported $107 billion in annual sales for 2024, beating the near-$98 billion notched by Tesla.

And last week, BYD unveiled an ultra-fast charging system, which it said was capable of adding 250 miles (402 km) of range in just five minutes, easily outdoing Tesla’s charging technology. Tesla’s Superchargers take 15 minutes to charge an EV, providing a range of 200 miles.

Tesla has also suffered slumping sales in Europe. In February, the carmaker sold around 40% fewer vehicles on the continent compared with the same month in 2024, according to the European Automobile Manufacturers’ Association.

Jessecok

02 May 2025 - 12:59 am

Josh Giddey hits halfcourt buzzer-beater over LeBron James to cap wild finale as the Bulls stun the Lakers
quickswap
Josh Giddey hit a game-winning, halfcourt buzzer-beater over LeBron James as the Chicago Bulls stunned the Los Angeles Lakers in one of the wildest endings to an NBA game you are ever likely to see.

Trailing 115-110 with 12.6 seconds remaining, Giddey’s inbound pass found Nikola Vucevic, who pushed the ball to a wide-open Patrick Williams for a corner three-pointer.

James then fluffed the Lakers inbound pass from the baseline, allowing Giddey to steal the ball and find Coby White for a second Bulls triple in quick succession to put Chicago up 116-115 with 6.1 seconds remaining.
Austin Reaves then made a driving layup to put the Lakers ahead 117-116 with 3.3 seconds left, but the game wasn’t done yet.

With no timeouts remaining, Giddey inbounded the ball to Williams from the baseline, got the pass back, took one dribble and launched a shot from beyond halfcourt.

Supporters in the stands seemed frozen in anticipation as the ball sailed through the air, and the United Center then erupted as it fell through the net. After the dramatic win, Giddey found himself being swarmed by his teammates.

“Special moment to do it with these guys, this team,” Giddey said, per ESPN. “We’ve shown over the last month to six weeks that we can beat anybody. The way we play the game, I think it wears people down.

“We get up and down. We run. We put heat on them to get back. A lot of veteran teams don’t particularly want to get back and play in transition.”

Giddey later told the Bulls broadcast that he’d “never made a game-winner before.”

The ending capped an incredible couple of games for the Lakers, who had themselves won their last game against the Indiana Pacers on Wednesday with a buzzer-beating tip-in from James.

Billymex

02 May 2025 - 12:20 am

Mist and microlightning
solflare
To recreate a scenario that may have produced Earth’s first organic molecules, researchers built upon experiments from 1953 when American chemists Stanley Miller and Harold Urey concocted a gas mixture mimicking the atmosphere of ancient Earth. Miller and Urey combined ammonia (NH3), methane (CH4), hydrogen (H2) and water, enclosed their “atmosphere” inside a glass sphere and jolted it with electricity, producing simple amino acids containing carbon and nitrogen. The Miller-Urey experiment, as it is now known, supported the scientific theory of abiogenesis: that life could emerge from nonliving molecules.
For the new study, scientists revisited the 1953 experiments but directed their attention toward electrical activity on a smaller scale, said senior study author Dr. Richard Zare, the Marguerite Blake Wilbur Professor of Natural Science and professor of chemistry at Stanford University in California. Zare and his colleagues looked at electricity exchange between charged water droplets measuring between 1 micron and 20 microns in diameter. (The width of a human hair is 100 microns.)

“The big droplets are positively charged. The little droplets are negatively charged,” Zare told CNN. “When droplets that have opposite charges are close together, electrons can jump from the negatively charged droplet to the positively charged droplet.”
The researchers mixed ammonia, carbon dioxide, methane and nitrogen in a glass bulb, then sprayed the gases with water mist, using a high-speed camera to capture faint flashes of microlightning in the vapor. When they examined the bulb’s contents, they found organic molecules with carbon-nitrogen bonds. These included the amino acid glycine and uracil, a nucleotide base in RNA.

“We discovered no new chemistry; we have actually reproduced all the chemistry that Miller and Urey did in 1953,” Zare said. Nor did the team discover new physics, he added — the experiments were based on known principles of electrostatics.

“What we have done, for the first time, is we have seen that little droplets, when they’re formed from water, actually emit light and get this spark,” Zare said. “That’s new. And that spark causes all types of chemical transformations.”

Herbertplets

01 May 2025 - 11:57 pm

A tiny rainforest country is growing into a petrostate. A US oil company could reap the biggest rewards
swell
Guyana’s destiny changed in 2015. US fossil fuel giant Exxon discovered nearly 11 billion barrels of oil in the deep water off the coast of this tiny, rainforested country.

It was one of the most spectacular oil discoveries of recent decades. By 2019, Exxon and its partners, US oil company Hess and China-headquartered CNOOC, had started producing the fossil fuel.? They now pump around 650,000 barrels of oil a day, with plans to more than double this to 1.3 million by 2027.

Guyana now has the world’s highest expected oil production growth through 2035.

This country — sandwiched between Brazil, Venezuela and Suriname — has been hailed as a climate champion for the lush, well-preserved forests that carpet nearly 90% of its land. It is on the path to becoming a petrostate at the same time as the impacts of the fossil fuel-driven climate crisis escalate.

While the government says environmental protection and an oil industry can go hand-in-hand, and low-income countries must be allowed to exploit their own resources, critics say it’s a dangerous path in a warming world, and the benefits may ultimately skew toward Exxon — not Guyana.

Darrenskels

01 May 2025 - 11:05 pm

Хотелось бы вам владеть ресурсом для изучения английского языка, который обновляется каждый день? Если да (а мы уверены, что – да), тогда учите английский при помощи новостей!


Breaking news (последние новости), новые и оригинальные истории привлекают внимание и одновременно улучшают ваши знания английского. Они познакомят вас с важной повседневной лексикой и помогут лучше освоить структуру английского предложения. Кроме того, изучение новостей на английском может помочь в общении с носителями языка. Когда вы будете знать, что происходит в мире, в котором они живут, сможете лучше говорить на их языке. А еще всегда будет о чем поговорить!

Вам точно понравится удобство изучения английского с помощью новостей, чтения статей в интернете, прослушивания новостных подкастов или просмотра роликов в приложении в любое удобное время и в любом месте. И мы не будем ограничиваться только роликами с субтитрами на ютубе.

Предлагаем список ресурсов для просмотра и чтения новостей на английском языке. Некоторые из них созданы специально для изучающих язык, другие – аутентичные медиа, давно полюбившиеся носителям языка.

E-news
E-news

Один из новых ресурсов, созданный специально для тех, кто изучает английский. Подойдет как для уровня Elementary, так и для Advanced. Здесь вы можете читать новости о политике, науке, технологиях, спорте, путешествиях и пр. Кроме того, можете быстро найти интересующую тему, используя теги.

Сайт еженедельно освещает множество событий. Например, читайте релиз о «Фантастических тварях, и где они обитают» в 3-х разных вариантах, соответствующих каждому уровню изучения языка.

В каждой статье выделены основные слова с переводом на русский. Наведите на них курсором и увидите его в контексте. Еще одна крутая фишка – аудиосопровождение, которое вы выбираете в зависимости от уровня вашего английского.
kra31 cc
В целом, сайт очень круто оформлен и удобен для пользователя.

The Times in Plain English


Как сказано на главной странице – The Times in Plain English («The Times на понятном/простом английском) это «четкое написание» для «глобального прочтения». Сервис помогает понимать читателям по всему миру подлинные английские новостные статьи. Это означает, что новички могут получать свою дозу свежих новостей без необходимости обращаться за каждым вторым словом к словарю.
kra31
Сайт берет статьи из различных публикаций, в том числе и The New York Times, и переписывает их, используя простые слова и короткие предложения. Здесь освещаются темы здоровья, образования, законов, иммиграции, денег и работы. Также вы найдете ссылку на оригинальную статью, если захотите усложнить себе задачу.


К сожалению, сейчас в сети очень много посредственного контента. А когда вы не носитель языка, вам такой контент не нужен. Нужен – качественный.
kra31.cc
Что делать? Читайте аутентичные (подлинные) новостные статьи с четким и ясным языком, написанные людьми разных культур.

USA Today
USA Today может многое предложить не носителям языка. Статьи написаны в лаконичном и прямом стиле. Здесь вы найдете актуальные новости США, множество тем о науке и технике, спорте и путешествиях, колонки различных авторов.

The Guardian Newspapers
The Guardian Newspapers

The Guardian – еще один отличный online источник различных английских новостных историй. Кроме того, он предлагает несколько вариантов: The Guardian – для американцев, The Guardian – для англичан. Выбирайте, какой английский вам больше по душе, и читайте.

Сервисы располагают огромной коллекцией новостных статей, посвященных политическому миру, бизнесу, образу жизни и пр.

В The Guardian`s Long Read вы найдете поистине крутой материал для улучшения навыков чтения и аудирования.

The New York Times` Times Minute
kraken31

https://kra---31---at.ru

Robertarrah

01 May 2025 - 09:40 pm

Family affair
rhino fi
Americans Brittany and Blake Bowen had never even been to Ecuador when in 2021 they decided to move to the South American country with their four children.

Tired of “long commutes and never enough money” in the US, the Bowens say they love their new Ecuadorian life. “We hope that maybe we’ll have grandkids here one day.”

Erik and Erin Eagleman moved to Switzerland from Wisconsin with their three children in 2023.

“It feels safe here,” they tell CNN of their new outdoorsy lifestyle in Basel, close to the borders with France and Germany. Their youngest daughter even walks to elementary school by herself.

For adventures with your own family, be it weekend breaks or something longer-term, our partners at CNN Underscored, a product review and recommendations guide owned by CNN, have this roundup of the best kids’ luggage sets and bags.

Starry, starry nights
For close to 100 years, Michelin stars have been a sign of culinary excellence, awarded only to the great and good.

Georges Blanc, the world’s longest-standing Michelin-starred restaurant, has boasted a three-star rating since 1981, but this month the Michelin guide announced that the restaurant in eastern France was losing a star.

More culinary reputations were enhanced this week, when Asia’s 50 best restaurants for 2025 were revealed. The winner was a Bangkok restaurant which is no stranger to garlands, while second and third place went to two Hong Kong eateries.

You don’t need to go to a heaving metropolis for excellent food, however. A 200-year-old cottage on a remote stretch of Ireland’s Atlantic coast has been given a Michelin star. At the time of awarding, Michelin called it “surely the most rural” of its newest winners.