Science & Technology
NASA rover finds fresh evidence of the warm and wet past of Mars
A mineral called siderite found abundantly in rock drilled by a NASA rover on the surface of Mars is providing fresh evidence of the planet’s warmer and wetter ancient past when it boasted substantial bodies of water and potentially harbored life.
The Curiosity rover, which landed on Mars in 2012 to explore whether Earth’s planetary neighbor was ever able to support microbial life, found the mineral in rock samples drilled at three locations in 2022 and 2023 inside Gale crater, a large impact basin with a mountain in the middle, Reuters reported.
Siderite is an iron carbonate mineral. Its presence in sedimentary rocks formed billions of years ago offers evidence that Mars once had a dense atmosphere rich in carbon dioxide, a gas that would have warmed the planet through the greenhouse effect to the point that it could sustain bodies of liquid water on its surface.
There are features on the Martian landscape that many scientists have interpreted as signs that liquid water once flowed across its surface, with potential oceans, lakes and rivers considered as possible habitats for past microbial life.
Carbon dioxide is the main climate-regulating greenhouse gas on Earth, as it is on Mars and Venus. Its presence in the atmosphere traps heat from the sun, warming the climate.
Until now, evidence indicating the Martian atmosphere previously was rich in carbon dioxide has been sparse. The hypothesis is that when the atmosphere – for reasons not fully understood – evolved from thick and rich in carbon dioxide to thin and starved of this gas, the carbon through geochemical processes became entombed in rocks in the planet’s crust as a carbonate mineral.
The samples obtained by Curiosity, which drills 1.2 to 1.6 inches (3-4 centimeters) down into rock to study its chemical and mineral composition, lend weight to this notion. The samples contained up to 10.5% siderite by weight, as determined by an instrument onboard the car-sized, six-wheeled rover.
“One of the longstanding mysteries in the study of Martian planetary evolution and habitability is: if large amounts of carbon dioxide were required to warm the planet and stabilize liquid water, why are there so few detections of carbonate minerals on the Martian surface?” said University of Calgary geochemist Benjamin Tutolo, a participating scientist on NASA’s Mars Science Laboratory Curiosity rover team and lead author of the study published on Thursday in the journal Science, opens new tab.
“Models predict that carbonate minerals should be widespread. But, to date, rover-based investigations and satellite-based orbital surveys of the Martian surface had found little evidence of their presence,” Tutolo added.
Because rock similar to that sampled by the rover has been identified globally on Mars, the researchers suspect it too contains an abundance of carbonate minerals and may hold a substantial portion of the carbon dioxide that once warmed Mars.
The Gale crater sedimentary rocks – sandstones and mudstones – are thought to have been deposited around 3.5 billion years ago, when this was the site of a lake and before the Martian climate underwent a dramatic change.
“The shift of Mars’ surface from more habitable in the past, to apparently sterile today, is the largest-known environmental catastrophe,” said planetary scientist and study co-author Edwin Kite of the University of Chicago and Astera Institute.
“We do not know the cause of this change, but Mars has a very thin carbon dioxide atmosphere today, and there is evidence that the atmosphere was thicker in the past. This puts a premium on understanding where the carbon went, so discovering a major unsuspected deposit of carbon-rich materials is an important new clue,” Kite added.
The rover’s findings offer insight into the carbon cycle on ancient Mars.
On Earth, volcanoes spew carbon dioxide into the atmosphere, and the gas is absorbed by surface waters – mainly the ocean – and combines with elements such as calcium to form limestone rock. Through the geological process called plate tectonics, this rock is reheated and the carbon is ultimately released again into the atmosphere through volcanism. Mars, however, lacks plate tectonics.
“The important feature of the ancient Martian carbon cycle that we outline in this study is that it was imbalanced. In other words, substantially more carbon dioxide seems to have been sequestered into the rocks than was subsequently released back into the atmosphere,” Tutolo said.
“Models of Martian climate evolution can now incorporate our new analyses, and in turn, help to refine the role of this imbalanced carbon cycle in maintaining, and ultimately losing, habitability over Mars’ planetary history,” Tutolo added.
Science & Technology
UAE sets minimum social media age at 15, mandates age checks
The government said the measures were designed to address concerns over children’s exposure to inappropriate content, unsafe online interactions, excessive social media use and the collection of personal data.
The United Arab Emirates has set a minimum age of 15 for social media use, becoming the first Arab country to introduce such a restriction as governments worldwide seek to address growing concerns over the impact of online platforms on children.
Under a resolution approved on Thursday, children under 15 will be prohibited from creating, using or operating personal social media accounts. The ban means they will not be able to post content, comment, share or join public groups, the government’s media office said, Reuters reported.
Teenagers aged 15 and 16 will be allowed to use social media platforms subject to enhanced safeguards, including age-appropriate content controls, restrictions on interaction with unknown users, screen-time management tools and parental supervision features.
The rules apply to all social media platforms operating in the UAE and require companies to implement robust age-verification measures, including digital identity checks and artificial intelligence-supported technologies. Self-declaration of age will not be accepted as a valid form of verification.
Platforms must also disable accounts created by children under 15, prevent users from circumventing age-verification systems and refrain from using children’s personal data for targeted advertising or behavioural profiling.
The government said the measures were designed to address concerns over children’s exposure to inappropriate content, unsafe online interactions, excessive social media use and the collection of personal data.
Social media companies will have up to 12 months to comply with the new regulations.
The UAE said the framework aligns with international efforts to strengthen online child protection while balancing digital access with safety.
Several countries, including Australia and others in Europe, have moved to tighten restrictions on children’s use of social media amid mounting concerns about its effects on mental health and online safety.
Regional
Iran banks hit by major cyber attack
Officials said a technical investigation confirmed that the disruptions were the result of a cyberattack.
Several major Iranian banks experienced service disruptions on Saturday following a cyberattack, according to the Coordinating Committee of Iran’s state-owned banks.
The outage affected four major financial institutions, including Bank Melli Iran, Bank Saderat Iran, and Bank Tejarat, causing interruptions to mobile and online banking services, automated teller machines (ATMs), point-of-sale (POS) terminals, and some card transactions.
Officials said a technical investigation confirmed that the disruptions were the result of a cyberattack.
The affected banks stated that their technical teams immediately implemented precautionary measures after detecting the incident in an effort to safeguard customer information and protect banking infrastructure.
Qatasi, secretary of the Coordinating Committee of Iran’s state-owned banks, said necessary recovery and repair measures had been carried out.
Authorities said there is currently no evidence that customer data was accessed without authorization, and no data breach has been reported.
Science & Technology
GLP-1 drugs may have a beneficial effect across many types of cancer
The drugs, originally designed to treat diabetes and found to promote weight loss, have also shown benefits for heart risks, sleep apnea and alcohol and substance abuse.
A growing body of evidence suggests that popular GLP-1 drugs, widely used for weight loss and diabetes, can provide protection against many types of cancer, Reuters reported.
More than two dozen studies presented over the past few days at the American Society of Clinical Oncology meeting in Chicago found that patients taking the drugs showed lower risks of developing cancer and disease progression, better survival, and improved responses to some treatments, compared with people who were not taking the GLP-1s.
The studies included analyses of clinical records and real-world databases tracking patients taking Novo Nordisk’s (NOVOb.CO), Wegovy or Ozempic, Eli Lilly’s (LLY.N), Zepbound or Mounjaro, or older GLP-1 treatments.
The studies were not designed to show how or why GLP-1 use might affect cancer treatment. But researchers believe by reducing inflammation, regulating insulin signaling and possibly engaging directly with tumor biology, they may contribute to a protective effect in cancer patients.
“Chronic inflammation is a fundamental biological pathway involved in the development and progression of many cancers,” said Dr. Elizabeth Susan McDonald of the University of Pennsylvania.
McDonald on Tuesday reported on a study of 110,000 women, showing those who took GLP-1 medications were up to 35% less likely to develop breast cancer than those who did not.
While obesity itself is a known risk factor for certain cancers, the anti-inflammatory effects of GLP-1s will likely prove to have a role in cancer prevention, McDonald said.
GLP-1 drugs include semaglutide, the active ingredient in Wegovy, Ozempic and Rybelsus; tirzepatide, sold as Mounjaro and Zepbound, as well as Lilly’s Trulicity, or dulaglutide, and Novo’s older liraglutide, sold as Saxenda and Victoza.
Some of the strongest signals of benefit came from a study of more than 12,000 patients that showed GLP-1 use was associated with markedly lower odds of cancers advancing to metastatic disease, particularly in lung, breast, colorectal and liver cancers.
People with those cancers who took liraglutide, pramlintide, dulaglutide, tirzepatide, lixisenatide, or semaglutide were 38% to 50% less likely to see the disease spread than people who took drugs from a different class of diabetes medicines known as gliptins.
Reduced cancer incidence, longer survival, and fewer metastases were also seen with GLP-1 use in patients with endometrial, bladder and prostate cancers, as well as in those with small intestine neoplasms and blood cancers, multiple studies found.
A separate analysis of patients treated at U.S. community oncology practices found GLP-1 use was associated with significantly better overall survival across six tumor types – breast, prostate, colorectal, lung, liver and kidney – with a roughly one-third reduction in the risk of death.
Researchers also reported that cancer patients receiving immunotherapies such as Merck’s (MRK.N), Keytruda and Bristol Myers Squibb’s (BMY.N), Opdivo or Yervoy appeared to fare better when they were taking GLP-1 drugs, suggesting a possible interaction with the immune system.
GLP-1 users with type 2 diabetes and stage 3 kidney disease had substantially lower mortality and lower rates of several malignancies, particularly lung, colorectal, and hepatocellular cancers, than non-users, read the report.
While GLP-1 medications carry a warning regarding a possible association with a type of thyroid cancer based on rodent studies, researchers say the recent findings point to a potential beneficial class effect across tumor types, rather than benefits confined to a small subset of cancers.
The drugs, originally designed to treat diabetes and found to promote weight loss, have also shown benefits for heart risks, sleep apnea and alcohol and substance abuse.
“These drugs have never been just glucose-lowering agents,” Dr. Marcin Chwistek of the Fox Chase Cancer Center in Philadelphia said at an ASCO press briefing.
Researchers cautioned that nearly all of the data presented were from observational studies, raising the risk of confounding factors. Patients prescribed GLP-1 drugs may differ in important ways, including overall health, access to care and concurrent treatments, that could influence outcomes.
While the various studies tried to account for those differences, none can prove the drugs improve cancer outcomes. Experts said trials in which GLP-1s are added to standard treatment in some cancer patients but not others are needed to establish clear anti-cancer benefits. Some trials are already being planned.
The apparent cancer benefits were not clearly tied to the drugs’ weight-loss effects, suggesting that alone does not explain the findings, Reuters reported.
A seven-year study with nearly 120,000 participants found GLP-1s were associated with lower rates of new prostate cancer diagnoses in high-risk men, compared to drugs such as Merck’s Propecia and GSK’s (GSK.L), Avodart, which are used to shrink enlarged prostate glands.
GLP-1 users had a “very small” reduction in body weight at one year, said Dr. Colton Jones of the University of Texas San Antonio Mays Cancer Center who presented the study at ASCO.
“We hypothesize that both weight loss and a direct anti-cancer effect and anti-inflammatory effect may be driving the associations observed in our study,” Jones said.
ASCO expert Chwistek said anti-inflammatory and immune-modulating properties have long suggested broader effects of GLP-1s.
Referring to one of the largest studies, Chwistek said: “What’s new here is the consistency across tumor types, and data this large and this consistent warrant a prospective randomized trial.”
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