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天津武清区龙济医院治早泄手术贵不贵
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发布时间: 2025-05-30 05:29:59北京青年报社官方账号
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(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

  天津武清区龙济医院治早泄手术贵不贵   

(CNN) -- JPMorgan wants to give people with criminal records a second chance at a good job.The United States is boasting its lowest unemployment rate in nearly 50 years, but that doesn't hold true for people with prior convictions. Enter the largest bank in the country, which said on Monday it wants to level the playing field."When someone cannot get their foot in the door to compete for a job, it is bad for business and bad for communities that need access to economic opportunity," said JPMorgan CEO Jamie Dimon in a press release.The bank said it wants to broaden its pool of potential employees after already hiring some people with a conviction on their record for entry-level jobs, like transaction processing and account servicing.The United States loses between billion and billion in annual GDP by excluding people who have a criminal record from the workforce, according to the bank. Studies also show that providing education and opportunities also reduces recidivism."Jamie [Dimon] believes, and we believe as a firm, that business has an important role to play in building a more inclusive economy," Heather Higginbottom, president of the newly launched JPMorgan Chase PolicyCenter, told CNN Business.Financial institutions are regulated by the Federal Deposit Insurance Corporation as far as hiring goes. The agency began relaxing the rules last year.JPMorgan has now "banned the box" that asks prospective employees whether they have a criminal record.Barriers to entryBut there are still plenty of employers requiring the disclosure of prior convictions, and that poses a barrier to entry to the job market for people with a criminal background.Because of that, the unemployment rate is much higher for Americans with records than for those without. In fact, it's an estimated 27% for the roughly five million formerly incarcerated people in the country, according to JPMorgan. That is compared with 3.5% for the United States as a whole.A record that is eligible for pardon or to get expunged shouldn't matter for a job applicant, Higginbottom said.But if you robbed a bank, chances are you're still not getting hired by JPMorgan."We're not lowering our hiring standards," Higginbottom said.Last year, 10% of its hires — 2,100 people — had some sort of criminal record, she added. Crimes ranged from disorderly conduct to personal drug possessions and DUI charges.Getting a record expunged can be confusing and the process differs from state to state, Higginbottom said. A study done in Michigan showed that only 6.5% of people eligible for a clean slate actually go through the process of expunging their records. Pennsylvania, Utah and California have passed laws to automate the process. A handful of other states are moving to do the same.JPMorgan said it will be working with community organizations that can help guide people in the process.The bank said it will invest some billion in community organizations in cities including Chicago, Detroit and Nashville to support people with a criminal past. 3046

  天津武清区龙济医院治早泄手术贵不贵   

(KGTV) - At least a dozen San Diego County schools investigated threats against campuses the week after the school shootings in Parkland, Fla.The timeline shows the potential emergencies for school officials and law enforcement.  242

  

(KGTV) – A bill to end the retail sale of dogs, cats, and rabbits in California is heading to Gov. Gavin Newsom's desk for approval.Assembly Bill 2152, known as "Bella’s Act," would ban the retail sale of dogs, cats, and rabbits, while allowing stores to partner with rescues and shelters for adoption events. The bill stops pet stores from receiving any money from adoption transactions or from using the store or its resources in connection with adoption events.Assemblymember Todd Gloria, of San Diego, introduced the bill in February 2020. The bill is sponsored by the San Diego Humane Society.RELATED:San Diego area puppy stores accused of selling dogs from puppy millsFake animal rescue group sued for alleged "puppy laundering scheme"San Diego-area pet stores cited for illegal puppy sales"The mass breeding operations of puppy mills are unhealthy and inhumane. We don’t want animals experiencing that cruelty in California," said Assemblymember Todd Gloria. "Bella’s Act will finally fulfill our state’s promise to end the illicit puppy mill industry and encourage pet retailers to partner with rescues and shelters for adoption events. I urge the Governor to sign this bill and ensure we no longer tolerate or facilitate puppy mill cruelty in this state."While California implemented a ban on the sale of dogs, cats, and rabbits in retail stores in 2019, unless the animals were obtained from a shelter or rescue group, some retails utilized a loophole in the law by importing animals from outside the state for sale.Bella's Act was named after a corgi named "Bella" who was illegally bred in a puppy mill, before being sold in a San Diego County pet store where she was advertised as a rescue animal. Bella sold for thousands of dollars. Her owner says the dog was declawed while in the puppy mill and developed severe bronchitis that led to costly medical bills.Bella has since recovered but still suffers from anxiety.San Diego Humane Society President and CEO Dr. Gary Weitzman said, “We are thrilled with the passage of AB 2152, Bella’s Act, to close loopholes in the law that allowed unscrupulous pet store owners to continue to ship puppy mill puppies into our state for sale. Thanks to Assemblymembers Gloria and O’Donnell, California will finally end the retail sales of dogs, cats and rabbits once and for all. We look forward to receiving Governor Newsom’s signature and to the impact this critical legislation will have on the importation and sale of inhumanely bred animals in our state.” 2518

  

(KGTV) - Do some California cities have laws on the books banning wearing a disguise in public and using Silly String on Halloween?Yes!In Walnut, it's illegal to wear a mask or disguise on a public street any day of the year.In Hollywood, using Silly String on Halloween can get you a ,000 fine.And any private establishment in California can ban you from entering if you're wearing a costume.At least that's not as harsh as Chesapeake, Virginia where anyone over 13 caught trick-or-treating can get up to six months in jail! 535

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