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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.”

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Supporting multiple types of cryptocurrency, Mixero is one of the most flexible Bitcoin tumblers available today. Besides requiring a minimum deposit, service fees are charged, and users are required to register to use this site. Referral programs are also on offer along with support for multiple recipient addresses (max 10). Yomix : Fast payouts Bitcoin Laundry : Uses stealth pools to anonymize transactions Coinmize : Zero-log policy Mixero : Excellent customer support Bitcoin Mixer : It offers flexible transaction fees and a low minimum transaction limit 1. Yomix - Fast payouts Yomix 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, Yomix also accepts Bitcoins with a no log policy.One of the most currency-rich mixers in the industry, letting us Mix not just Bitcoin but Litecoin, Bitcoin Cash and Ethereum (coming soon) is what Yomix is. Also flaunts probably the most colourful and easy to use Interfaces I’ve ever seen. Provides 100% Control to users regarding every aspect of the mix. As in, users control the exact amount of fee (to the 4th decimal point!), the exact time-delay (by the minute and not just hours) and also the Percentage distribution. It’s transparent and even has a “fee calculator” which displays the exact amount of funds a user would receive on each additional address, as well as the total service and the address-fee. Maximum 8 total output addresses allowed. The minimum service fee a user can pay is 1%, with the maximum being 5%. The additional address fee is 0.00045529 BTC, 0.01072904 LTC, and 0.00273174 BCH for Bitcoin, Litecoin and Bitcoin Cash respectively. Has three fund-pools, and they all have funds from different sources in them which have different levels of anonymity. Does have a “No Logs Policy”. No registration required.Bitcoin Blender isn’t as heavily decorated as Yomix, 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.How it works: you fill in the whole amount of the resource account and the Yomix system divides it into small amounts and distributes them to different wallets, mixing them with the coins of other clients or with bitcoins taken on a foreign cryptocurrency exchange, you also get them in small portions to your wallet already washed. This process increases the anonymity of your coins. Features of the service: The main difference between this server is that it has 2 different mixing modes. Cleaning is carried out automatically.In one of the modes, pure BTC is received through foreign cryptocurrency exchanges. Guarantees with PGP signatures are used. Low and high minimum and maximum entry thresholds from 0.001 BTC to 50 BTC. The mixing procedure takes up to 6 hours. Note that there are services that offer to wait 1-2 days. Registration on this platform is not required. Cleaning is carried out automatically. Data encryption is practiced. At the time of writing, Yomix is one of the best BTC mixing services out there. We definitely recommend it. Pros: Excellent customer support Zero-log policy 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 offers a unique service with a high degree of confidentiality, which will ensure the anonymity of your payments, by using the mixing of multiple Bitcoin addresses. Our system works quickly, reliably and with a small commission – only after the transfer and receipt of funds to the final address. Of course, all of the data about your transaction will be irretrievably deleted.As well as others, Bitcoin Laundry has both a clear-web CryptoMixer. This mixing service is notable for accommodating extremely large-volume transactions. After public verification of their reserve of 2000 BTC there is no doubt that users can trust this mixing service and their cryprocurrencies will not be taken. The number of needed confirmations differs depending on the deposited amount, e.g. for depositing less that 25 BTC there is only 1 confirmation needed, in case of sending more than 1000 BTC a user needs to gather 5 confirmations. To use this platform, a Bitcoin Laundry code needs to be created. A user should note it, so it is easy to use it next time. After entering a CryptoMixer code, users need to provide the output address or several of them and then set a time-delay feature. A delay time is determined automatically and a user can modify it if needed. A service fee can be also selected from the table depending on the sent sum. Each transaction requires additional fee of 0.0005 BTC. Also, a calculator on the main page helps every user to see the amount of crypto money sent and got back after mixing.Bitcoin Laundry is a coin cleaning service that can hide your footprints in the cryptocurrency world. 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Pros: Uses stealth pools to anonymize transactions Allows extra payout addresses 5. Bitcoin Mixer - It offers flexible transaction fees and a low minimum transaction limitOne absolutely unique crypto mixing service is Bitcoin Mixer because it is based on the totally different principle comparing to other services. A user does not just deposit coins to mix, but creates a wallet and funds it with chips from 0.01 BTC to 8.192 BTC which a user can break down according to their wishes. After chips are included in the wallet, a wallet holder can deposit coins to process. As the chips are sent to the mixing service beforehand, next transactions are nowhere to be found and there is no opportunity to connect them with the wallet owner. There is no usual fee for transactions on this mixing service: it uses “Pay what you like” feature. It means that the fee is randomized making transactions even more incognito and the service itself more affordable. 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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.

Arctic auroras
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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.