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Kevinles

03 May 2025 - 12:51 am

A long time in the making
Curiosity landed in Gale Crater on August 6, 2012. More than 12 years later, the rover has driven over 21 miles (34 kilometers) to ascend Mount Sharp, which is within the crater. The feature’s many layers preserve millions of years of geological history on Mars, showing how it shifted from a wet to a dry environment.
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Perhaps one of the most valuable samples Curiosity has gathered on its mission to understand whether Mars was ever habitable was collected in May 2013.

The rover drilled the Cumberland sample from an area within a crater called Yellowknife Bay, which resembled an ancient lake bed. The rocks from Yellowknife Bay so intrigued Curiosity’s science team that it had the rover drive in the opposite direction to collect samples from the area before heading to Mount Sharp.
Since collecting the Cumberland sample, Curiosity has used SAM to study it in a variety of ways, revealing that Yellowknife Bay was once the site of an ancient lake where clay minerals formed in water. The mudstone created an environment that could concentrate and preserve organic molecules and trapped them inside the fine grains of the sedimentary rock.

Freissinet helped lead a research team in 2015 that was able to identify organic molecules within the Cumberland sample.

The instrument detected an abundance of sulfur, which can be used to preserve organic molecules; nitrates, which are essential for plant and animal health on Earth; and methane composed of a type of carbon associated with biological processes on Earth.

“There is evidence that liquid water existed in Gale Crater for millions of years and probably much longer, which means there was enough time for life-forming chemistry to happen in these crater-lake environments on Mars,” said study coauthor Daniel Glavin, senior scientist for sample return at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, in a statement.

Johnniehearl

03 May 2025 - 12:18 am

Curiosity rover makes ‘arguably the most exciting organic detection to date on Mars’
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The NASA Curiosity rover has detected the largest organic molecules found to date on Mars, opening a window into the red planet’s past. The newly detected compounds suggest complex organic chemistry may have occurred in the planet’s past — the kind necessary for the origin of life, according to new research.

The organic compounds, which include decane, undecane and dodecane, came to light after the rover analyzed a pulverized 3.7 billion-year-old rock sample using its onboard mini lab called SAM, short for Sample Analysis at Mars.

Scientists believe the long chains of molecules could be fragments of fatty acids, which are organic molecules that are chemical building blocks of life on Earth and help form cell membranes. But such compounds can also be formed without the presence of life, created when water interacts with minerals in hydrothermal vents.

The molecules cannot currently be confirmed as evidence of past life on the red planet, but they add to the growing list of compounds that robotic explorers have discovered on Mars in recent years. A study detailing the findings was published Monday in the journal Proceedings of the National Academy of Sciences.
The detection of the fragile molecules also encourages astrobiologists that if any biosignatures, or past signs of life, ever existed on Mars, they are likely still detectable despite the harsh solar radiation that has bombarded the planet for tens of millions of years.

“Ancient life, if it happened on Mars, it would have released some complex and fragile molecules,” said lead study author Dr. Caroline Freissinet, research scientist at the French National Centre for Scientific Research in the Laboratory for Atmospheres, Observations, and Space in Guyancourt, France. “And because now we know that Mars can preserve these complex and fragile molecules, it means that we could detect ancient life on Mars.”

Collintib

02 May 2025 - 10:36 pm

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Rogersoand

02 May 2025 - 08:57 pm

Siham Haleem, a private tour guide for 15 years, says that Doha now has many world-class, modern museums — the National Museum of Qatar being a firm personal favorite. And yet he says that visiting Sheikh Faisal’s museum should still be on everybody’s to-do list.
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“For those eager to learn about Qatar’s — and the region’s — heritage and beyond, the museum is an ideal destination,” he says. “Personally, I’m captivated by the car collection, the fossils, and especially the Syrian house, painstakingly transported and reassembled piece by piece.”

Stephanie Y. Martinez, a Mexican-American student mobility manager at Texas A&M University in Qatar likes the museum so much she includes it on all of her itineraries for students visiting from the main campus in Texas.

“The guided tours are very detailed, and the collections found at the museum have great variety and so many stories to unfold,” she says. “Truly, the museum has something to pique everyone’s interest. My favorites are the cars and the furniture exhibits showcasing wood and mother-of-pearl details. Definitely one of my favorite museums in Qatar, every time I visit I learn something new.”

Raynor Abreu, from India, also had praise for the unusual and immense collection.

“Each item has its own story, making the visit even more interesting,” he says. “It’s also impressive to know that Sheikh Faisal started collecting these unique pieces when he was very young. Knowing this makes the museum even more special, as it reflects his lifelong passion for history and culture.”

It takes time and dedication to truly examine the many collections within the museum — especially since most of them are simply on display without explanation.

Eclectic it may be, but it’s hard to fault the determination of Sheikh Faisal, who has brought together items that tell the story of Qatar and the Middle East.

Sarah Bayley, from the UK, says she visited the museum recently with her family, including 16 and 19-year-old teenagers, and was won over by its sheer eccentricity.

“Amazing. Loved it. It is a crazy place.”

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02 May 2025 - 07:56 pm

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02 May 2025 - 06:13 pm

Another solid Bitcoin Tumbler option, Mixer Money requires a minimum deposit of 0.01 BTC to be made but makes up for this with a lower transaction fee of 2% coupled with a 0.0004 BTC network fee. Support for multiple addresses and customer options is provided with users required to provide confirmation for only 1 address. While there is no referral program available, Mixer Money does offer users with a letter of guarantee for their peace of mind. Yomix : It offers flexible transaction fees and a low minimum transaction limit Bitcoin Laundry : Uses stealth pools to anonymize transactions Coin Mixer : Fast payouts Coinmize : Zero-log policy Mixero : Excellent customer support 1. Yomix - It offers flexible transaction fees and a low minimum transaction limitYomix is a simple service that will increase your privacy while using Ethereum and making Ether transactions. Every single person have its right for a personal privacy even when transacting, trading or donating Ether. Due to ethereum blockchain features you are not completely anonymous while using ETH and here comes Ethereum Mixing Service to help you cut all ties between your old and fresh mixed ETH coins. Using Yomix mixer makes almost impossible to trace your new Ethereum Address..How it works: unlike other mixers, this site cleans coins with bitcoins purchased by them on cryptocurrency exchanges. Yomix io examines purchased coins using a scoring system with innovative algorithms and the use of technologies such as blockchain volume analysis, cluster analysis, pollution analysis, etc. After that, you will receive your BTC back, divided into random parts, and even sent in different addresses, if necessary. The whole process takes about 6 hours. The mixer does not require registration and does not store any logs. After each mixing operation, a letter of guarantee is sent, and information about it is eliminated after 24 hours, ensuring complete anonymity. The service also provides round-the-clock technical support. MixTum io charges a flat fee of 5% of the transaction, as well as a network fee of 0.00015 BTC. The program has two versions – for regular browsers and Tor.Compared to other Bitcoin tumblers, Yomix stands out from the crowd thanks to the additional anonymity offered. Users are given the option to split and merge coins into different wallets to various addresses. Additionally, Yomix provides support for unlimited addresses and does not require user registration. Although only Bitcoin is supported and there are no referral programs, ChipMixer does not charge users with any service fees. With the option to donate BTCs being made available.Yomix is another one that requires consideration. It supports Bitcoin cryptocurrency bearing no logs policy. It requires a minimum deposit of 0.001 BTC and the transaction fee is 4–5%. It supports multiple addresses of 2 or custom options and requires confirmation. No registration is required and it does not offer a referral program. Letter of guarantee is offered. Pros: Provides user-controlled time delays It offers flexible transaction fees and a low minimum transaction limit 2. Bitcoin Laundry - Uses stealth pools to anonymize transactions Let’s take a look at another one of the leading bitcoin mixers which is incredibly easy to operate. Bitcoin Laundry has a straightforward interface and it is worth mentioning that the service fee is the lowest possible, it is 0.0% with 0.0002 BTC per extra address. Retention period is 7 days when it is easy for a user to manually remove all the logs which are saved for this period because of any future transaction-related problems. There is a time-delay feature, however, it is not possible to be controlled by a user but the mixing platform only.Bitcoin Laundry is a Bitcoin cleaner, tumbler, shifter, mixer and a lot more. It has a completely different working principal than most other mixers on this list. So, it has two different reserves of coins, one for Bitcoin and the other for Monero. It cleans coins by converting them to the other Cryptocurrency. So, you can either clean your Bitcoins and receive Monero in return, or vice-versa. The interface is pretty straight-forward. You simply choose your input and output coins, and enter your output address. For now, only 1 output address is supported which we believe simplifies things. The fee is fixed which further makes it easier to use. You either pay 0.0002 BTC when converting BTC to XMR, or 0.03442 XMR when converting XMR to BTC. It also provides a secret key which can be used to check transaction status, or get in touch with support. The process doesn’t take long either, Bitcoin Laundry only demands 1 confirmation before processing the mixes. Bitcoin amounts as low as 0003BTC and XMR as low as 0.05 can be mixed. It doesn’t require any registrations so obviously there’s no KYC. The company seems to hate the govt. and has a strict no-log policy as well.The principle of operation of the resource is that Bitcoin Laundry sends coins of all users to a single account, mixes them, and then distributes coins to users. You get the same amount (minus commission) of already cleared bitcoins, including several from different parts of the blockchain. Which makes it almost impossible to analyze it. The mixer also sends you a letter of guarantee. This letter of guarantee is a confirmation of the obligations of BitMix biz and that the service has generated an address for the user to send. This email is always signed from the main bitcoin account Bitcoin Laundry (publicly available at BitMix biz). The service also uses a unique code of 12 characters, after that, this user will never receive exactly his own coins back. Save this code it will be needed for the affiliate program. BitMix biz includes an affiliate program and pays users when they bring other users to the platform. You will receive a fee for every transaction you refer to. BitMix biz’s robust privacy policy is backed by several points: No registration and identity verification required. Transaction history is deleted after 72 hours. The randomization function makes the analysis of the protocol more difficult. Tor browser support.What marks Bitcoin Laundry out from the crowd is the fact that this crypto mixer is able to process transactions for Bitcoin and Litecoin. There is a minimum deposit requirement for both Bitcoin and Litecoin. The site is able to support a maximum of 5 multiple addresses with confirmation required for all addresses. No site registration is required and there is a referral program in place. Additionally, Bitcoin Laundry can provide clients with a letter of guarantee. Pros: Excellent customer support It has a positive reputation among the Bitcoin community 3. Coin Mixer - Fast payouts It is a simple service with a high level of anonymity. The Coin Mixer mixing process is very simple and only takes a couple of minutes. You need to select one of the three supported cryptocurrencies (Bitcoin, Litecoin, Bitcoin Cash), enter the withdrawal address, set the transaction delay for any time up to 72 hours, send the coins to the specified address and wait for their delivery to the destination. This site is unlike the other three mixing pools. You can mix user’s coins: with incoming coins of other customers, private reserves of the service and investor coins. The service does not require registration. The mixing commission is not large and is taken from the mining commission, which is very convenient. The referral program at SmartMixer is one of the most profitable, during the first mixing operation you receive a smart code that is required to receive a discount on the commission, this discount can reach – 70%. After each transaction, the user receives a letter of guarantee. All data about it is deleted after a day, while maintaining the complete anonymity of the client.Coin Mixer has a deposit requirement of 0.001 BTC and supports a maximum of 2 different addresses. Registration is not compulsory but there is a service charge of 4 – 5% on the amount being transferred. For those with a need for additional privacy, Coin Mixer also accepts Bitcoins with a no log policy.Coin Mixer is one of the most pocket-friendly, easy to use and customizable Bitcoin laundry platforms in the industry. The user-interface is extremely simple and clean, anyone who has never before used any such service too can navigate around and tumble Bitcoins easily. No registration is required to mix Bitcoins on Blender.io Its “delay” feature lets you set delays from 1-24 hours which increases your anonymity by providing a gap between the deposited coins and the outgoing ones. As for the fee, it’s dynamic, meaning you get to choose the amount of fee you’d like to pay, the minimum fee being 0.5% and the maximum being 2.5% with an additional 0.0005%/address. It’s also one of the rare platforms which provides you with a mixing code which makes sure your previous coins do not get mixed with your newer deposits if you do multiple deposits to the tumbler. The minimum amount you can mix is 0.001BTC while there’s no specific maximum amount as their Bitcoin reserve seems to be quite large. It also has a No Logs Policy and all data is instantly deleted as soon as a transaction is complete; and as for the number of confirmations required it’s 3 for your deposit to be mixed by Coin Mixer It supports 8 addresses for each mix so you can further increase your anonymity. In a nutshell, it gives you the power to choose, is fast, anonymous and totally worth a try. It also supports Segwit and bech32 Addresses, with some terms attached. For e.g. only witness version bech32 addresses are supported. Similarly, only the addresses starting with the number “3” are supported.This is by far the most unique Coin Mixer I’ve ever encountered till date; that’s so pertaining to its “Time-travel” feature! (Whoa!) Basically instead of operating on the traditional receive unclean coins > send clean coins process, it instead uses a create wallet > fund it with chips beforehand > receive unclean coins > grant access to the pre-funded wallet process! This lets users spend the clean coins even before the unclean coins were sent to the mixer (because the wallet was pre-funded) and that’s the reason I termed it the time-travel mixer. Also it funds the wallets with “chips” which are not the same thing as Bitcoins, they’re basically the private keys which can be exported to your Bitcoin wallets to fund your wallets with the amount the chips were worth. It also lets users bet their Chips which has a chance of doubling the worth of their chips, other advanced features include merging which lets users combine two big chips into one single chip, or splitting which divides one big chip into two smaller chips. Its fee structure too is an unique- “Pay what you like” feature, which not only adds to user anonymity by randomizing the fee but also makes the service more affordable and customizable. Because users completely control when or how much funds they wish to withdraw, it translates into 100% user control on time-delays and distribution control. No logs are kept after a 7-day retention period; or there also is an option to manually scrub all logs whenever you wish prior to this 7-day period. The minimum deposit limit on the platform is 0.0001BTC. Pros: Extensive FAQ section Provides user-controlled time delays 4. Coinmize - Zero-log policy Being one of the earliest crypto coin tumblers, Coinmize continues to be a easy-to-use and functional crypto coin mixer. There is a possibility to have two accounts, with and without registration. The difference is that the one without registration is less controllable by a user.The mixing process can be performed and the transaction fee is charged randomly from 1% to 3% which makes the transaction more anonymous. Also, if a user deposits more than 10 BTC in a week, the mixing service reduces the fee by half. With a time-delay feature the transaction can be delayed up to 24 hours. A Bitcoin holder should worry security leak as there is a 2-factor authentication when a sender becomes a holder of a PGP key with password. However, this mixing platform does not have a Letter of Guarantee which makes it challenging to address this tumbler in case of scams.And last but not least, there is a coin mixer with a number of cryptocurrencies to tumbler named Coinmize. At the moment, there are three currencies and Ethereum is going to be represented in future. This mixer offers a very simple user-interface, as well as the opportunity to have control over all steps of the mixing process. A user can select a delay not just by hours, but by the minute which is very useful. The tumbler gives the opportunity to use a calculator to understand the amount of money a user finally receives. The service fee is from 1 % to 5 % with fees for extra addresses (0.00045529 BTC, 0.01072904 LTC, and 0.00273174 BCH). Having funds from different resources helps the crypto mixer to keep user’s personal information undiscovered. This last mixer does not offer its users a Letter of Guarantee.Coinmize makes the process of clearing bitcoins very easy and convenient for the client. This resource requires one confirmation of the transaction, after which new clean coins are sent to the specified wallet. Users can also control latency for processing their transactions. This is an offshore service, and its sites are also located offshore. This provides users with additional peace of mind and confidence that their data is strictly confidential. In addition, once the transaction is confirmed, users are sent a unique “delete logs” link, giving users the ability to manually delete their traces of transactions. Coinmize charges a modest 0.5% commission. This makes BTC Blender ideal for users clearing large amounts of bitcoin.Bitcoin Blender isn’t as heavily decorated as Coinmize, as far as the webpage design goes. But the services and reviews are in no way less as compared to any of the top Bitcoin Tumbler services on the web. It’s a service functional since 2014, and offers two different kind of accounts: Quickmix: Requires no login, but offers lesser control Login enabled account: Requires you to login, provides for more control than the quickmix account. The mixing service is only accessible from its Onion URL, and even though it has a clearnet URL, it primarily only serves an educational purpose. It’s exclusively a Bitcoin mixing service, and supports only Bitcoin. As for the fee, it doesn’t have anything specific, and charges a random fee between 1-3%. This is done to keep our Bitcoins anonymous and more secure, rather than tagging them with a specific fee. Although there’s a special program, or incentive so to say, if amounts worth more than 10 BTC are deposited within a time-frame of 7 days, the fee is reduced by half! Obviously, there also is the time-delay feature, allowing us to delay the transaction by as much as 24 hours. As for security, it supports 2-factor authentication, facilitated with a customized PGP key which ensures only the holder of the PGP key along with the knowledge of the password can access your accounts. It also supports as many as 5 simultaneous deposit addresses, which get you the power to deposit unmixed funds by splitting them into more than one single transaction. And finally, there’s a no logs policy as well, and all the data including deposit addresses and support messages are deleted after 10 days. Pros: Doesn’t require registrationOffers a low minimum deposit of 0.002 BTC 5. Mixero - Excellent customer support Another coin scrambler Mixtum offers you a so-called free trial period what means that there are no service or transaction fee charged. The process of getting renewed coins is also quite unique, as the tumbler requires a request to be sent over Tor or Clearnet and renewed coins are acquired from stock exchanges.And last but not least, there is a coin mixer with a number of cryptocurrencies to tumbler named Mixero. At the moment, there are three currencies and Ethereum is going to be represented in future. This mixer offers a very simple user-interface, as well as the opportunity to have control over all steps of the mixing process. A user can select a delay not just by hours, but by the minute which is very useful. The tumbler gives the opportunity to use a calculator to understand the amount of money a user finally receives. The service fee is from 1 % to 5 % with fees for extra addresses (0.00045529 BTC, 0.01072904 LTC, and 0.00273174 BCH). Having funds from different resources helps the crypto mixer to keep user’s personal information undiscovered. This last mixer does not offer its users a Letter of Guarantee.Mixero is one of the most pocket-friendly, easy to use and customizable Bitcoin laundry platforms in the industry. The user-interface is extremely simple and clean, anyone who has never before used any such service too can navigate around and tumble Bitcoins easily. No registration is required to mix Bitcoins on Blender.io Its “delay” feature lets you set delays from 1-24 hours which increases your anonymity by providing a gap between the deposited coins and the outgoing ones. As for the fee, it’s dynamic, meaning you get to choose the amount of fee you’d like to pay, the minimum fee being 0.5% and the maximum being 2.5% with an additional 0.0005%/address. It’s also one of the rare platforms which provides you with a mixing code which makes sure your previous coins do not get mixed with your newer deposits if you do multiple deposits to the tumbler. The minimum amount you can mix is 0.001BTC while there’s no specific maximum amount as their Bitcoin reserve seems to be quite large. It also has a No Logs Policy and all data is instantly deleted as soon as a transaction is complete; and as for the number of confirmations required it’s 3 for your deposit to be mixed by Mixero It supports 8 addresses for each mix so you can further increase your anonymity. In a nutshell, it gives you the power to choose, is fast, anonymous and totally worth a try. It also supports Segwit and bech32 Addresses, with some terms attached. For e.g. only witness version bech32 addresses are supported. Similarly, only the addresses starting with the number “3” are supported.Another solid Bitcoin Tumbler option, Mixero requires a minimum deposit of 0.01 BTC to be made but makes up for this with a lower transaction fee of 2% coupled with a 0.0004 BTC network fee. Support for multiple addresses and customer options is provided with users required to provide confirmation for only 1 address. While there is no referral program available, Mixero does offer users with a letter of guarantee for their peace of mind. Pros: Has impressive time delaysIt has a positive reputation among the Bitcoin community

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02 May 2025 - 05:04 pm

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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.
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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.
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“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

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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.