Mars Minerals Reveals an Ancient Ocean's Potential For Life - and a Possible Way to Make Oxygen
Researchers have identified a ring of minerals around the largest basin in the northern hemisphere of Mars (which past research suggests held a large body of water). Phys.org says the research provides new clues on when life may have been possible on Mars — and how future astronauts could make oxygen:
Manganese oxides and hydroxides (collectively written as manganese (hydr)oxides) can act as geological proxies for past oceans... The team involved in the new study analyzed short-wave infrared (SWIR) data from China's Zhurong rover, ESA's OMEGA orbiter and NASA's CRISM orbiter to identify and quantify manganese (hydr)oxides... The team says the placement of the ring indicates that the ring formed during the Hesperian epoch — a geologic period on Mars that occurred roughly 3.7 to 3.0 billion years ago. The Hesperian epoch marked the transition from the warmer, wetter, and volcanically active Martian world to a cold, dry, and dusty planet... [when "the potential for further prebiotic evolution on the surface was significantly reduced."]
"This yields a final estimated duration of 0.8-1.5 million years for the presence of stable aqueous conditions in Utopia Planitia. This timescale significantly exceeds what is typically expected for transient surface water activity on Mars, suggesting that Utopia Planitia hosted a long-lived and evolving aquatic system during the Hesperian epoch, rather than a short-lived or rapidly evaporating water body," write the study authors. The researchers say that although this does not provide direct evidence of early life, it does suggest that Mars may have provided an environment conducive to initiating early forms of life. The timeline of the ocean matches the minimal timescale required for prebiotic chemistry, and also temporally overlaps with the period on Earth in which scientists believe the earliest forms of life first arose, approximately 3.4 billion years ago. The study authors also note that the conditions for life may have also extended into the next Amazonian period on Mars. They write, "If MnOx formation or redistribution occurred during the Amazonian, this would suggest that Mars may have maintained episodic or localized liquid water environments significantly later than traditionally assumed."
Interestingly, the authors also bring up the potential for future human habitation on Mars. They suggest that oxygen can be produced by using the manganese (hydr)oxides for water-splitting reactions that generate oxygen through photocatalysis, potentially supporting human activities or even terraforming. Of course, this would be a long way off.
Read more of this story at Slashdot.
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DuckDuckGo Installs Up 30% After Google Announced AI Search
After Google announced AI-emphasizing changes to its search results, many web surfers began defecting to DuckDuckGo, reports TechCrunch. (They describe DuckDuckGo as "a privacy-focused alternative" that accounts for around 2% of the U.S. search market...)
DuckDuckGo said U.S. app installs went up 18.1% week-over-week on average during the May 20 to May 25 period, compared to May 13 to May 18. The company said that growth was sustained for six consecutive days and peaked at 30.5% on May 25. On iOS, the rate of install is even higher, with week-over-week growth hitting a 33% average, peaking at 69.9%... DuckDuckGo said the trend is stronger in the U.S, and that DuckDuckGo continued to gain users over the Memorial Day weekend, when it usually sees a dip in traffic. Some of that data is backed up by third parties. App analytics company Apptopia found a 29% increase in average daily downloads in the U.S. and a 12% increase globally over the same period.
DuckDuckGo also said visits to its AI-free search page, noai.duckduckgo.com averaged 22.7% week-over-week growth, peaking at 27.7% on May 24, according to the article. ("DuckDuckGo also offers an AI Image Filter that filters out AI-created images from search results.")
TechCrunch delves into the reason why:
I overheard a woman on the phone saying she was switching to DuckDuckGo because you can "opt out of using AI... Google just isn't Google anymore," she said. It seems that others had the same idea... Some have argued it will kill the open web, while others shared concerns that AI overviews surface inaccurate responses and take away control from users who might not want to use AI. It also overcomplicates simple things.
A Google spokesperson pointed out that AI Mode isn't the default in their search results. (And CNET notes Google include an AI-free "Web" choice in its results if you just want a page of ftraditional blue links.)
TechCrunch adds that DuckDuckGo also offers a separate free tool called Duck.ai offering access to models including Claude, Meta's Llama and OpenAI's GPT-5 mini. "All chats are private because DuckDuckGo strips the user's IP address before requests reach model providers, deletes conversations within 30 days, and prevents chats from being used for training."
Read more of this story at Slashdot.
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A research team found "extensive changes" on brain scans of 13 young women taking
GLP-1 drugs, reports the Washington Post:
Within only a few months, the brain connections in the salience network, which helps target attention, had multiplied... ["We didn't expect to see this effect, and we really don't know what it means," said an assistant professor assisting the research.] Ozempic and other GLP-1 drugs were initially understood as a metabolism breakthrough: medicines that act like hormones to control hunger, blood sugar and weight. But as researchers probe deeper into how the drugs work, early evidence suggests that GLP-1s may also be reshaping parts of the brain.
Tens of millions of people are now taking the medications worldwide, turning what began as an obesity and diabetes treatment into what could be modern medicine's largest unplanned neuroscience experiments... Long before Oprah Winfrey and social media influencers helped popularize GLP-1 drugs, physician-scientist Lorenzo Leggio was studying them as a possible addiction treatment... Several major studies examining GLP-1 drugs on nicotine dependence, opioid- and cocaine-use disorders, gambling addiction and binge eating are also underway. "It's very exciting times, but we don't fully understand how it works," Leggio said...
As evidence has grown that inflammation, metabolism and mental health may be far more connected than scientists once believed, researchers have become intrigued by patients who say GLP-1 drugs appear to ease anxiety, compulsive thinking and emotional distress. Daniel Drucker, a University of Toronto researcher and GLP-1 drug pioneer who receives funding from several drugmakers, said researchers are investigating the medications across a variety of psychiatric and neurological conditions, though none are approved for them. "We have so many anecdotal reports: They were treated for blood sugar and then they felt much happier. Or they took one dose of the drug and their brain fog cleared," he said.
The article suggests social media complaints "raise deeper questions about what, exactly, these drugs are changing.
"If GLP-1s alter the brain systems involved in reward, craving and motivation, researchers wonder, where is the line between quieting a person's destructive impulses and reshaping personality itself?"
Read more of this story at Slashdot.