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发布时间: 2025-05-30 13:08:00北京青年报社官方账号
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  喀什华康医院预约挂号   

(CNN) -- Scientists have discovered a "monster black hole" so massive that, in theory, it shouldn't exist.It's a stellar black hole — the type that forms after stars die, collapse, and explode. Researchers had previously believed that the size limit was no more than 20 times the mass of our sun because as these stars die, they lose most of their mass through explosions that expel matter and gas swept away by stellar winds.This theory has now been toppled by LB-1, the newly-discovered black hole. Located about 15,000 light years away, it has a mass 70 times greater than our sun, according to a press release from the Chinese Academy of Sciences.The findings were published by Chinese researchers in the journal Nature on Wednesday."Black holes of such mass should not even exist in our galaxy, according to most of the current models of stellar evolution," said Liu Jifeng, head of the team that made the discovery. "LB-1 is twice as massive as what we thought possible. Now theorists will have to take up the challenge of explaining its formation."Scientists are now scratching their heads at how LB-1 got so huge.The Chinese team has proposed a number of theories. LB-1's sheer size suggests that it "was not formed from the collapse of only one star," the study said -- instead, it could potentially be two smaller black holes orbiting each other.Another possibility is that it formed from a "fallback supernova." This is when a supernova -- the last stage of an exploding star -- ejects material during the explosion, which then falls back into the supernova, creating a black hole.This fallback formation is theoretically possible, but scientists have never been able to prove or observe it. If this is how LB-1 formed, then we may have "direct evidence for this process" for the first time, the study said.LB-1 is not the biggest black hole ever discovered -- but it may be the largest of its kind. There are several types of black holes, and stellar black holes like LB-1 are on the smaller side, according to NASA. Supermassive black holes are much bigger -- they can be billions of times the mass of our sun.Scientists believe supermassive black holes may be connected to the formation of galaxies, as they often exist at the center of the massive star systems -- but it is still not clear exactly how, or which form first.Stellar renaissanceStellar black holes are believed to be commonly scattered across the universe, but they are difficult to detect because they do not normally emit X-rays -- only doing so when they gobble up gas from a star that has ventured close enough. They are so elusive that scientists have only found, identified, and measured about two dozen stellar black holes, the press release said.The researchers at the Chinese Academy of Sciences tried a different approach. Instead of looking for X-rays emitted by black holes, the team looked for stars that were orbiting some invisible object, being pulled in by its gravity.Their efforts paid off -- they soon spotted a giant star eight times heavier than the sun, orbiting around what turned out to be LB-1."This discovery forces us to re-examine our models of how stellar-mass black holes form," said David Reitze, a physicist at the University of Florida. In May, Reitze's team made its own breakthrough discovery -- observing the never-before-seen collision of a neutron star and a black hole, which sent out ripples in space and time.These twin discoveries -- the collision, and now LB-1 -- indicate that scientists are reaching "a renaissance in our understanding of black hole astrophysics," said Reitze in the press release.There have been several other discoveries over the past year that have added to this renaissance. In October, researchers discovered what they believe to be a new type of black hole, smaller than the other kinds. And earlier this week, astronomers discovered a black hole that is actually helping baby stars grow instead of destroying them. 3971

  喀什华康医院预约挂号   

(KGTV) — Did a survey really find 7 percent of adults think chocolate milk comes from brown cows?Yes!The 2017 poll from the Innovation Center for U.S. Dairy found 48 percent of adults didn’t know how chocolate milk was made and 7 percent thought it came from brown cows. 278

  喀什华康医院预约挂号   

(CNN) -- With the end of the year approaching, it's not uncommon to start thinking about health goals for the new year, like losing weight, eating healthier, exercising and quitting smoking. But though we may have good intentions, choosing January 1 to make promises to get on a healthier track year-round doesn't always work. In fact, according to a 2017 Marist poll, about a third of people who make a New Year's resolution fail to stick with it.This doesn't mean we should give up on setting health goals for the new year. But it does mean we might need to rethink our goal-setting strategies.Monday resolutions According to some experts, rather than setting a year-long goal at the start of the year, a more effective approach is to make "Monday resolutions": weekly goals that can be thought of as mini-resolutions, taking advantage of the natural momentum of our weekly cycles, giving us a chance to start fresh each week."If I mess up my diet on Tuesday or Wednesday, I know I can get back on track the following Monday," said Lindsay Schwartz, a busy mom of two based in New York, who aims to eat healthfully and stay fit but finds herself eating one too many of her kids' Charleston Chews left over from a birthday party or her own favorite indulgence, a handful of Lindt chocolates. There's no sense starting again on Thursday or Friday, or even Saturday, and Sunday is basically a "free-for-all," according to Schwartz. "Monday is the only day that will work."Unlike other days of the week, Mondays offer the opportunity for a health reset, when you might set intentions, celebrate progress or simply get back on your plan."Monday can be thought of as the New Year's of the week -- a time to refresh and put our past bad deeds behind us and try and do better in the coming week," said Joanna Cohen, director of the Johns Hopkins Bloomberg School of Public Health Institute for Global Tobacco Control.Peggy Neu, president of The Monday Campaigns initiative, agrees that "it makes achieving our health goals more sustainable. New Year's only comes around once per year, but Mondays come every seven days. You basically get 52 chances a year to stay on track."Focusing on a new goal or health initiative each week that will build on the previous is also an excellent way to ease someone into a new healthier lifestyle, said Marjorie Cohn, a registered dietitian and spokeswoman for the Academy of Nutrition and Dietetics. "Monday resolutions can help create more tangible positive outcomes for people to recognize."Reflecting on small successes can be empowering. "Setting mini-goals creates a feeling of accomplishment, and when someone feels positive, they tend to make more positive choices. It's the snowball effect," Cohn said.This may be especially true when it comes to weight loss. "Losing 50 to 100 pounds seems impossible. The amount of work, the length of time, the reality of it seems daunting and can truly deter people from even trying," said Amy Shapiro, registered dietitian and founder of Real Nutrition, a New York-based private health practice. "When we break it up into weekly goals, it helps to see progress, feel confident, reach benchmarks and feel motivated to continue."Using Monday as a cue for quitting smoking can be particularly beneficial, according to Cohen. "For most people, it takes multiple tries to actually quit for good. But there's a lot of self-learning that happens each time you try. With a weekly cue, you get to try again more often and learn more quickly and hopefully be more successful sooner, versus only trying to quit on New Year's Day," Cohen said.In fact, research shows that Mondays are a natural opportunity to engage smokers and reduce their likelihood of relapse. "It's the January of the week, the day that smokers are looking for help," Cohen said.The Monday effect on healthIn a study titled "What's the healthiest day?" published in the American Journal of Preventive Medicine, Cohen and her colleagues set out to determine whether there were any "circaseptan" or weekly patterns in health-promoting behaviors among individuals. The goal was to figure out whether the days of the week seem to make a difference in terms of when people are thinking about improving their health."It made sense from a practical perspective that at end of the week are parties, and you may not necessarily be at your healthiest. ... Maybe you are eating more food than you should. And the idea was that maybe, when you get to the beginning of the week again, it's behind you, and you might think of being healthier."Cohen's team looked at people's Google searches from 2005 to 2012, particularly search terms that included the word "healthy.""We looked at things like 'healthy recipes,' 'healthy diet,' those sort of things, to see if there were patterns in searches by day of the week. And indeed, at the beginning of the week -- specifically Monday and Tuesday -- more people are searching for healthy things, and then it sort of drops off as you get closer to the weekend," Cohen said.In fact, Monday and Tuesday "healthy" searches were 30% greater than the combined Wednesday through Sunday average. "You make the connection that the searches are an expression of what people are thinking about ... and people are thinking about being healthier earlier in the week rather than later in the week," Cohen said.The Monday CampaignsCohen's research revealed that for people who want to help others be healthier, it might make sense to reach them in the beginning of the week instead of a Friday or Saturday, when they are less likely to be thinking about being healthier. Her research helped to inform the Monday Campaigns, a nonprofit initiative that has taken the foundational concept of Monday as a health reset and applied it to health behaviors, providing individuals and organizations with tools and resources to help them achieve their health goals.Monday Campaigns include "Kids Cook Monday," "Meatless Monday," "Move it Monday," "Quit and Stay Quit Monday" and "DeStress Monday."For example, "Move it Monday" developed "The Monday Mile," an activity designed to help people start their week moving together. "All you have to do is map a route wherever you're at, gather your group and have fun walking!" said Shannon Monnat, the Lerner Chair for Public Health Promotion at Syracuse University."Many organizations, universities and cities have adopted the Monday Mile activity and have seen great results," said Monnat, who has relied on resources from Move It Monday to help implement 30 permanent, easily accessible Monday Mile routes for Syracuse community members to jump-start their weekly physical activity goals.Camille Casaretti, the PTA wellness chair at P.S. 32 in Brooklyn, started "Kids Cook Monday" in her home before bringing the initiative to her children's school about three years ago. The program encourages families to make and eat tasty nutritious meals together and provides nutritious kid-friendly family recipes, like an "eye see you stir-fry."Casaretti's daughter is a fussy eater, but the initiative has helped her daughter become a star chef."My daughter is 10 now, and she can basically make an entire dinner meal now by herself from start to finish," Casaretti said."Just the awareness of fresh fruits and vegetables has become a regular conversation at our dinner table," she said. "When we go to the market, my kids know where all the vegetables are. ... They know how to read labels on packaged foods, and they are very aware of what is being marketed to them, and that helps them to make better choices in what they are eating.""Kids Cook Monday" has been very well-received at P.S. 32, according to Casaretti. "Parents really enjoy coming out with their family and cooking a meal together. We have cutting boards and knives that aren't too sharp, and a variety of recipes, which are sent out in advance." Recipe directions include "kid," "adult" and "together" steps."The black-eyed pea stir-fry is delicious. It has kale in it, and we had just been introducing kale in the cafeteria as part of the school foods menu. The recipe is really great. It's really easy to make, and the kids, parents and staff all loved it. It was really a winner."So whether your goal for the New Year is to cook more with your children, lose weight, get moving or quit smoking, just think: "Monday" is the new "January 1."For more on the concept of Monday resolutions, check out the Happy New Week YouTube video. 8510

  

(KGTV) - Chili’s is warning customers Friday about a possible payment card data breach at restaurants.The chain says malware was used to gather payment card information including credit or debit card numbers and cardholder names. Expiration dates and CVV codes on the back of cards may also have been accessed at certain Chili’s restaurants.The data were accessed between March and April of 2018, but Chili’s says a breach may have occurred on other dates.Chili’s said affected customers would have access to MyIDCare, a fraud resolution and credit monitoring service. It provides credit monitoring, a ,000,000 insurance reimbursement policy, exclusive educational materials, and fully managed identity theft recovery services.The chain is working with third-party forensic experts to determine the scope of the problem.Customers can call 888-710-8606 for more information. 883

  

(KGTV) - Did a colander-wearing "Pastafarian" really give the opening prayer at a government meeting in Alaska?Yes.Pastafarian pastor Barrett Fletcher delivered the invocation before the Kenai Peninsula Borough Assembly last Tuesday.Pastafarians promote a light-hearted view of religion and oppose the teaching of creationism.Last October, the Alaska Supreme Court ruled that invocations before government meetings couldn't be limited to official organizations.Since then, a satanist and now a pastafarian have been given the honor. 541

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