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November 10, 2025

Nov. 9, 2025, 9:45 AM ESTBy Kaitlin SullivanDrinking caffeinated coffee is safe for people with atrial fibrillation and may help protect against recurrence of the disorder, a new study finds.More than 10 million Americans live with atrial fibrillation, or A-fib, a common heart disorder that causes heart palpitations and can lead to heart failure, blood clots and stroke. Doctors have long tried to understand whether caffeine — which can increase heart rate and blood pressure — appears to trigger episodes that feel like a fluttering or thumping in the chest and cause dizziness or breathlessness.“There is no standard advice for atrial fibrillation and caffeine,” said Dr. Gregory Marcus, a cardiologist and professor of medicine at the University of California, San Francisco, who led the DECAF (Does Eliminating Coffee Avoid Fibrillation?) study. “It is very common for me to encounter patients who have stopped drinking caffeinated coffee only because their physician has told them to do so because of their atrial fibrillation.”The results of the DECAF study, a four-year clinical trial examining the effects of drinking coffee in people with a history of irregular heart rhythm that had either resolved or been treated, were presented Sunday at the annual American Heart Association conference in New Orleans and published in JAMA. Marcus is an associate editor of JAMA.The researchers recruited 200 older adults in Australia, Canada and the United States who were regular coffee drinkers at some point in the last five years. The average age was 70 and one-third were women.Over six months, the participants were randomized to two groups: those who cut out caffeine, and those who had at least one cup every day. Everyone self-reported their coffee and caffeinated beverage consumption during telehealth or video check-ins that occurred one, three and six months into the trial.Using data from electrocardiograms, or ECGs, taken in a doctor’s office, wearable heart monitors and implantable cardiac devices, Marcus and his team determined if and when people in each group had their first recurrent episode of A-fib. They included episodes of atrial flutter, a related condition that also causes abnormal contractions in the upper chambers of the heart.Both groups had about the same alcohol habits. Not everyone was a coffee drinker when the study began, but the number of daily coffee drinkers in each group was similar.Before the study began, 60% of people in the coffee-drinking group and 65% in the no-coffee group said that coffee had never triggered an A-fib episode.During the six-month study, 111 people, or 56%, had a recurrent episode of atrial flutter. People in the coffee drinking group were less likely to have a recurrence — 47% compared to 64% of people in the no-coffee group — and went a longer period of time before they had their first episode.(About a third of people in the no-coffee group did admit to drinking at least a cup during the study, while the rest didn’t consume any.)A cup a day ‘perfectly safe’It’s the latest study to show coffee may lower risks of heart problems and other metabolic disease. Previous observational research has suggested that people who drank coffee had less of a risk of A-fib, but the new trial shows a cause-and-effect relationship, said Marcus.“I was somewhat surprised at the magnitude of how protective caffeinated coffee does seem to be to prevent atrial fibrillation,” Marcus said.Dr. Johanna Contreras, a cardiologist at Mount Sinai Fuster Heart Hospital in New York, said the most significant takeaway from the study was that drinking a cup of coffee a day seems to be perfectly safe for people with A-fib, rather than that coffee is protective.“There’s not a hard-and-fast rule. Not everyone has the same reaction to caffeine,” said Contreras, who was not involved with the trial.There are notable limitations in the study, including the effects of caffeinated beverages other than coffee. The trial didn’t track differences in exercise habits or diet. People who drink coffee may also be exercising more, Marcus suggested.The study found that drinking just one cup of coffee per day appeared to have a protective effect, and while some people in the study did drink more than that, it’s unclear if more than a cup of coffee per day could have any effect on A-fib recurrence.Moderation is key, Contreras said.“If people are having six or seven cups of coffee, and then Red Bulls and Celsius, that’s different,” she said.It’s unclear why drinking coffee was linked with a lower risk of irregular heartbeat recurrence. It’s possible that an anti-inflammatory compound in coffee, not specifically caffeine, could have reduced recurrence in the coffee-drinking group, Marcus said.If caffeine is at play, it is possible that stimulating the body’s adrenaline response with caffeine could help stave off A-fib. People often report episodes when they are relaxed, such as while sleeping or after a big meal, when adrenaline is low, Marcus said, when the “rest and digest” part of the nervous system is activated.Also, the trial included only people who were not currently experiencing episodes of A-fib. The findings may not translate to people with the unmanaged disorder.“If someone was in the midst of A-fib, caffeine could certainly increase the pulse rate during that episode and therefore lead to worse symptoms,” he said.For people who are already regular coffee drinkers, “this shows you can have a cup of coffee in the morning and be OK if you have A-fib,” Contreras said.Kaitlin SullivanKaitlin Sullivan is a contributor for NBCNews.com who has worked with NBC News Investigations. She reports on health, science and the environment and is a graduate of the Craig Newmark Graduate School of Journalism at City University of New York.

October 11, 2025

Oct. 11, 2025, 12:30 PM EDT / Updated Oct. 11, 2025, 3:57 PM EDTBy Mirna AlsharifNo one is believed to have survived a powerful explosion at an explosives plant in Tennessee, officials said Saturday, as crews continue to recover remains from the blast site.“I can tell you that more than 300 people have been through almost every square inch of this facility, and at this time we’ve recovered no survivors,” Humphreys County Sheriff Chris Davis said at a news briefing.Davis would not share how many people were killed in the Friday-morning blast, saying, “We’re in the process of the identification of the remains.”“We can probably make the assumption, and I’m not even going to use the word assumption — I think that we can utilize, well, I have to use that word, forgive me — we can assume that they are deceased at this point.”Davis said that the cause of the blast at Accurate Energetic Systems near McEwen is still under investigation, and that he cannot rule out foul play.“That might be days or weeks or months before we can do that,” he said.The blast happened at around 7:45 a.m. Friday morning and “encompassed one whole building,” according to Davis.Officials on Friday said at least 18 people who were at the plant were unaccounted for. On Saturday, they did not provide an update on those individuals, reporting only that no survivors had been recovered.Search operations at the site of the explosion continued overnight as officials notified families waiting on word about their loved ones.Satellite image show the explosives plant in Humphreys County, Tenn., before and after the explosion on Friday.Satellite image 2025 VantorSatellite images from the scene of the blast show nothing remaining of the facility other than scattered debris.“As we get into this, we find it even more devastating than what we thought initially,” Davis said.Special Agent Guy McCormick with the Bureau of Alcohol, Tobacco, Firearms and Explosives said there are certified explosives specialists and bomb technicians on the scene to help make the area safe.“In a situation like this, what we find is that when these explosives are subject to the event that took place — which is heat, the explosion being thrown, pressure — they can change, and they can become different than how we know them to act,” McCormick said on Saturday.On Friday evening, a group of people gathered nearby in Centerville to hold a vigil after hearing about the blast. Attendees held candles and prayed. Felicity Howell, a nurse at Hickman County Middle School, was in her kitchen on Friday morning when she heard the explosion.”There was a huge boom and my house shook very, like, hard,” she said. “It honestly felt like a vehicle drove through our house. That’s what I thought whenever it happened. But then we found out it was the explosion that was about 10 miles down the road.” Accurate Energetic Systems on Friday extended thoughts and prayers in a statement to affected families, employees and community members. The privately owned facility, which processes ammunition and explosives, did not share any additional details on the explosion.The facility established a family assistance center to provide support for those affected by the incident, according to the Tennessee Emergency Management Agency (TEMA).There is no known threat to the public as a result of the blast, TEMA said. The agency is asking the public to avoid the area so emergency personnel can do their work “safely and efficiently.”“Residents who locate debris that may have originated from the explosion are asked to contact their local sheriff’s office,” TEMA said. “Trained personnel will respond to ensure the safe handling and collection of any debris.”The investigation into the incident is ongoing, officials said.The FBI is also assisting with the investigation.Mirna AlsharifMirna Alsharif is a breaking news reporter for NBC News.

October 5, 2025

Oct. 4, 2025, 6:00 AM EDTBy Jared PerloEarly last week in the Chinese tech hub of Hangzhou, a slick, larger-than-life video screen beamed out four words that would drive tech giant Alibaba’s stock to historic levels and signal a shift in China’s approach to artificial intelligence: “Roadmap to Artificial Superintelligence.”During his 23-minute keynote address at the flagship Alibaba Cloud conference, Alibaba CEO Eddie Wu charted out a future featuring artificial general intelligence (AGI) and artificial superintelligence (ASI). These terms point to a theorized era in which AI becomes roughly as smart as humans (AGI) and then much, much smarter (ASI).While these terms have been tossed around Silicon Valley for years, Wu’s presentation was notable: Alibaba is now the first established Chinese tech giant to explicitly invoke AGI and ASI.“Achieving AGI — an intelligent system with general human-level cognition — now appears inevitable. Yet AGI is not the end of AI’s development, but its beginning,” Wu said. “It will march toward ASI — intelligence beyond the human, capable of self-iteration and continuous evolution.”“ASI will drive exponential technological leaps, carrying us into an unprecedented age of intelligence,” Wu said, highlighting ASI’s ability to help cure diseases, discover cleaner sources of energy and even unlock interstellar travel.The U.S. and China are the world’s leading AI powers, each with immense computing capabilities and top-tier researchers developing cutting-edge systems. Yet observers have framed the countries as having different approaches to AI, with perceptions that China focuses more on real-world AI applications.For example, commentators recently argued that Beijing is currently “winning the race for AI robots” against the U.S., as China is home to much of the world’s most advanced robotics supply chains and a growing network of robotics, or embodied AI, labs.“There’s been some commentary in Western media recently about how the U.S. is missing the point by pushing for AGI, while China is focusing solely on applications,” said Helen Toner, interim executive director of Georgetown’s Center for Security and Emerging Technology. “This is wrong.”“Some Chinese researchers and some parts of the Chinese government have been interested in AGI and superintelligence for a long time,” Toner said, though she noted this view was primarily held by smaller startups like DeepSeek.China’s push for global AI dominance04:44Afra Wang, a researcher focusing on China’s tech scene, said Alibaba’s invocation of AGI and ASI was remarkable.“This ASI narrative is definitely something new, especially among the biggest tech companies in China,” she told NBC News.Alibaba’s “roadmap to artificial superintelligence” seems to scramble mainstream perceptions. Any number of California techno-optimists, like Anthropic’s Dario Amodei or xAI’s Elon Musk, might have delivered Wu’s speech, selling a technology-enabled utopia while largely sidestepping darker questions about how humanity would co-exist with or survive an era of digital superintelligence.The concept of superintelligence has long been on the minds of — if not explicitly guiding — prominent American AI companies. For example, OpenAI released an article focused on the safe development of superintelligent AI models in May 2023. “Now is a good time to start thinking about the governance of superintelligence — future AI systems dramatically more capable than even AGI,” the statement said.The possibility of superintelligence is now even being acknowledged in Congress. On Monday, Sen. Josh Hawley, R-Mo., and Sen. Richard Blumenthal, D-Ill., announced a draft bill that would, among other actions, “assist Congress in determining the potential for controlled AI systems to reach artificial superintelligence.”To some, ASI might seem like an outlandish concept when today’s AI systems fail to understand basic tennis rules, hallucinate or fabricate basic information, or do not seem to actually comprehend how the external world functions.At the same time, AI systems continue to approach and sometimes surpass human capabilities in many domains, from driving cars safely to winning international coding competitions, leaving many experts to say it’s a matter of when, not if, humans develop digital superintelligence.As the idea of superintelligence gradually enters mainstream debates, many American politicians have announced that the U.S. is in an AI race with China. The White House’s current AI manifesto is titled “Winning the AI Race: America’s AI Action Plan,” while Sen. Ted Cruz, R-Texas, proclaimed that “as a matter of economic security, as a matter of national security, America has to beat China in the AI race.”Yet charges of an AI race are muddied by a lack of an agreed end goal and swirling definitions of AGI. At worst, experts think an unfettered race toward AGI or ASI could lead to widespread catastrophe or even the end of humanity.But there’s also plenty of skepticism around talk of AGI and ASI and whether it’s primarily for marketing purposes.Alibaba is one of China’s largest tech companies, known for providing powerful, free AI models — also called open-source models — for download. Alibaba’s Qwen model series, a competitor to models like OpenAI’s GPT-5 or Anthropic’s Claude, is the most popular open-source AI system in the world.OpenAI launches Sora 2 wth AI social media app05:48Wu announced a new series of Qwen models in his speech last week, including a model that combines text, images, video and audio capabilities.Many observers point out that narratives about a U.S.-China AI race and a resulting sprint to build AI infrastructure serve AI investors by propping up company valuations and increasing their soft power. Alibaba’s stock has soared since Wu’s speech last week, part of a larger $250 billion comeback this year that has made it China’s hottest AI company.To unlock a powerful, superintelligent future, Wu predicted that large AI models will replace existing operating systems as the link between users, software and computational power. This future network of large AI models will run on cloud computing networks like Alibaba Cloud, he said.Irene Zhang, a researcher on China’s AI ecosystem and an editor of ChinaTalk, noted the business undertones of Wu’s announcement.“This is a vision of AGI and ASI that’s directly based on Alibaba’s business model,” she said.“Alibaba Cloud dominates China’s cloud computing market, and its global market share is now bigger than Oracle’s,” she said. “Alibaba’s commercial strategy and its publicly stated views on ASI/AGI are symbiotic.”Matt Sheehan, a senior fellow at the Carnegie Endowment for International Peace, agreed.“ASI is the ultimate frontier, as far as the discourse goes on AI,” Sheehan said. “It’s notable that Alibaba set this grandiose goal, but in reality, they’re selling cloud services.”Jared PerloJared Perlo is a writer and reporter at NBC News covering AI. He is currently supported by the Tarbell Center for AI Journalism.

October 8, 2025

Dolly Parton's sister asks for prayers for her health

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