西藏单直根密胺脂牙(用于SF教学模型)(南京内耳、听小骨及鼓膜放大模型) (今日更新中)

Two rural town school districts in the United States were shut down early for the Thanksgiving holiday weekend due to a fast-spreading stomach virus causing an abnormally high number of absences.Mesa County Valley School District officials in Grand Junction, Colorado, closed the school district to decontaminate November 20, the Wednesday before the week of Thanksgiving. A high number of students were increasingly calling out sick due to an illness going around. “Before the school district shut down, we were aware of at least 13 schools within (Mesa County Valley) School District 51 that had increased absenteeism levels due to illness and that number was growing,” district officials said on a Facebook live video, addressing the problem. “What we’re suspecting at this time is it’s very much acting like a norovirus.”On November 25, Greater Albany Public Schools in Albany, Oregon, announced a district-wide closure for similar reasons — norovirus was going around causing high levels of absences.“It spreads really like wildfire through a community,” said Dr. Chris Nyquist, the medical director of infection prevention and control at Children’s Hospital Colorado. “I think norovirus is one of those viruses that comes up in wintertime often when you have small communities, thinking about schools, where a lot of kids are together. It’s very contagious, spreads quickly.”Norovirus symptoms include vomiting, diarrhea and nausea that can last days.“The best method that these schools have done, in conjunction with talking to their health department, is to really shut down and do extensive cleaning,” Nyquist said.Norovirus can transfer easily through close contact, and symptoms start as soon as two hours later. In small communities like Grand Junction or Albany, an outbreak like this can have a large impact.“The thing that’s really special and unique about rural Colorado is that schools are often time the hub of the community,” said Elaine Belansky, the executive director for the Center for Rural Health and Education at the University of Denver. “They don’t have that many boots on the ground to address big challenges like this.”But those communities are doing what they can to stop illness from spreading just as the holidays begin. Mesa County Valley School District posted a video of the decontamination process in one of their classrooms to Facebook to show the efforts being done.As for prevention, Nyquist said the best thing to do is to wash your hands with soap and water. 2512

WhatsApp has revealed a vulnerability in its system that could have allowed hackers access to its users' phones, with a London-based human rights lawyer possibly among the targets.The encrypted messaging service, owned by Facebook, said Monday that it had discovered and fixed the vulnerability the attackers had sought to exploit. The hackers could implant malicious code on a victim's phone by placing a voice call to the victim on WhatsApp."The attack has all the hallmarks of a private company reportedly that works with governments to deliver spyware that takes over the functions of mobile phone operating systems," a WhatsApp spokesperson said in a statement.While WhatsApp did not name the private company, a source familiar with the investigation into the attack said that company is NSO Group, an Israeli cyber company 841

White House lawyers expect to have an opportunity to review whatever version of Robert Mueller's report Attorney General Bill Barr submits to Congress before it reaches lawmakers and the public, multiple sources familiar with the matter said, setting up a potential political battle over the hotly anticipated document.The attorneys want the White House to have an opportunity to claim executive privilege over information drawn from documents and interviews with White House officials, the sources said.The White House's review of executive privilege claims are within its legal purview, but could set up a political battle over the perception President Donald Trump is trying to shield certain information from the public about an investigation that has swirled around him since the first day of his presidency.Justice Department lawyers could advise him against certain assertions if they don't feel it's legally defensible. If Trump does assert executive privilege, the decision could be litigated in court if it's challenged, which Democrats would almost certainly do."There's always tension between what looks best politically and what represents the interests of the institution -- the office of the presidency," one source close to the White House said. "Preserving executive privilege trumps political optics."While Trump's personal attorney Rudy Giuliani suggested privilege could be used to keep parts of the report from public view, the issue is up to the White House, not the President's personal attorneys.The Justice Department and White House declined comment.As the White House is bracing for Mueller's investigation to conclude, some officials describe a sense of anxiety at the contents of the report, even as they welcome the probe's end.A person close to the President's legal team offered some caution in a sign of the level of anxiety about how closely held Mueller has kept his investigation."Let's get the airplane on the runway and see what we got," the source said.But Trump, who spent part of this weekend lambasting Mueller on Twitter, does not plan to be blindsided by what the Justice Department possibly discloses to Congress and the public of the report. Instead, his lawyers expect the contents will be viewed first by them. 2270

With 2020 fast approaching, and as happens with any year that ends in "0," people around the world are planning to celebrate the New Year with extra gusto.News outlets are publishing end of decade retrospectives. Magazines and podcasts are compiling the best songs, movies, and TV shows of the decade. 314

WASHINGTON, D.C. — At the official National Columbus Day Celebration in Washington, D.C. on Monday, the pomp and circumstance was in full swing.This year, though, the city itself wasn’t part of the party. A few days before, the D.C. city council voted to change Columbus Day to Indigenous Peoples' Day. The city joined more than 100 cities and a half-dozen states around the country that have chosen to honor Native Americans instead of the Italian explorer whose arrival brought conflict with indigenous people.“Columbus has a complicated history, but there is not one figure in history that does not have a complex history,” said Anita Bevacqua McBride, vice chairwoman of cultural affairs for the National Italian American Foundation.She said they don’t want to see Columbus Day disappear. Rather, they argue, there’s enough room on the calendar for both days.“I think in an era of inclusion and greater understanding of the diversity of our history, I think that’s fair,” Bevacqua McBride said. “But it doesn’t in our mind, give license, to erase what he did in terms of exploration of the new world.”Two miles away, at the National Congress of American Indians, Kevin Allis is happy to point out some of the mementos in his office.“I’m very proud of this vest. This is my grandfather’s vest and my great-grandmother made it for him,” he said, pointing to a 100-year-old vest with intricate beading, hanging framed in his office. “That’s a very sentimental piece to my family and I.”Allis said the change from Columbus Day to Indigenous Peoples' Day has been a long time coming.“We’re not trying to rewrite history,” Allis said. “We’re just trying to make people take the time to look at what real history is and understand we play an important role in that.”Competing roles in history that are still being debated over a holiday in the present. 1866

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