上海心脏搭桥模型(哈尔滨胎儿妊娠发育过程模型（10部件）) (今日更新中)

When astronaut Victor Glover climbed aboard the International Space Station early Tuesday morning, he became the first Black astronaut arriving for a long-term stay.Glover, along with his fellow SpaceX Crew Dragon capsule crewmates, will stay on the ISS for six months.A handful of Black astronauts have visited the orbiting lab during space shuttle missions, their stays were a few weeks. More than 300 astronauts from NASA have reached space to date, and Glover is the 15th Black astronaut to do so, according to the New York Times.Glover was selected as an astronaut in 2013, at the time he was serving as a Legislative Fellow in the United States Senate, according to NASA.He is now the pilot and second-in-command on the Crew-1 SpaceX Crew Dragon capsule, named Resilience. While onboard the ISS, he will serve as the Flight Engineer. 847

West Virginia is a red state, and not just in presidential politics.Just take a look at the "School Closings - At a Glance" map put out by the state Department of Education on its website.The map -- which sports different colors for delayed opens, early dismissals and closings -- is a solid red (for closings) since all 680 public schools in the state's 55 counties are closed because of the ongoing teachers' strike there.West Virginia employs nearly 20,000 classroom teachers in its public schools and has more than 277,000 students enrolled.Teachers hit the picket lines last week, demanding higher wages and better benefits. In 2016, West Virginia ranked 48th in the nation for average teacher salary, according to the National Education Association.Gov. Jim Justice signed legislation Wednesday giving teachers a pay raise, but educators said it wasn't enough and it didn't address other areas of concern like insurance and health care costs, so they went on strike. 990

Who gets to be first in line for a COVID-19 vaccine? U.S. health authorities hope by late next month to have some draft guidance on how to ration initial doses, but it’s a vexing decision.“Not everybody’s going to like the answer,” Dr. Francis Collins, director of the National Institutes of Health, recently told one of the advisory groups the government asked to help decide. “There will be many people who feel that they should have been at the top of the list.”Traditionally, first in line for a scarce vaccine are health workers and the people most vulnerable to the targeted infection.But Collins tossed new ideas into the mix: Consider geography and give priority to people where an outbreak is hitting hardest.And don’t forget volunteers in the final stage of vaccine testing who get dummy shots, the comparison group needed to tell if the real shots truly work.“We owe them ... some special priority,” Collins said.Huge studies this summer aim to prove which of several experimental COVID-19 vaccines are safe and effective. Moderna Inc. and Pfizer Inc. began tests last week that eventually will include 30,000 volunteers each; in the next few months, equally large calls for volunteers will go out to test shots made by AstraZeneca, Johnson & Johnson and Novavax. And some vaccines made in China are in smaller late-stage studies in other countries.For all the promises of the U.S. stockpiling millions of doses, the hard truth: Even if a vaccine is declared safe and effective by year’s end, there won’t be enough for everyone who wants it right away -- especially as most potential vaccines require two doses.It’s a global dilemma. The World Health Organization is grappling with the same who-goes-first question as it tries to ensure vaccines are fairly distributed to poor countries -- decisions made even harder as wealthy nations corner the market for the first doses.In the U.S., the Advisory Committee on Immunization Practices, a group established by the Centers for Disease Control and Prevention, is supposed to recommend who to vaccinate and when -- advice that the government almost always follows.But a COVID-19 vaccine decision is so tricky that this time around, ethicists and vaccine experts from the National Academy of Medicine, chartered by Congress to advise the government, are being asked to weigh in, too.Setting priorities will require “creative, moral common sense,” said Bill Foege, who devised the vaccination strategy that led to global eradication of smallpox. Foege is co-leading the academy’s deliberations, calling it “both this opportunity and this burden.”With vaccine misinformation abounding and fears that politics might intrude, CDC Director Robert Redfield said the public must see vaccine allocation as “equitable, fair and transparent.”How to decide? The CDC’s opening suggestion: First vaccinate 12 million of the most critical health, national security and other essential workers. Next would be 110 million people at high risk from the coronavirus -- those over 65 who live in long-term care facilities, or those of any age who are in poor health -- or who also are deemed essential workers. The general population would come later.CDC’s vaccine advisers wanted to know who’s really essential. “I wouldn’t consider myself a critical health care worker,” admitted Dr. Peter Szilagyi, a pediatrician at the University of California, Los Angeles.Indeed, the risks for health workers today are far different than in the pandemic’s early days. Now, health workers in COVID-19 treatment units often are the best protected; others may be more at risk, committee members noted.Beyond the health and security fields, does “essential” mean poultry plant workers or schoolteachers? And what if the vaccine doesn’t work as well among vulnerable populations as among younger, healthier people? It’s a real worry, given that older people’s immune systems don’t rev up as well to flu vaccine.With Black, Latino and Native American populations disproportionately hit by the coronavirus, failing to address that diversity means “whatever comes out of our group will be looked at very suspiciously,” said ACIP chairman Dr. Jose Romero, Arkansas’ interim health secretary.Consider the urban poor who live in crowded conditions, have less access to health care and can’t work from home like more privileged Americans, added Dr. Sharon Frey of St. Louis University.And it may be worth vaccinating entire families rather than trying to single out just one high-risk person in a household, said Dr. Henry Bernstein of Northwell Health.Whoever gets to go first, a mass vaccination campaign while people are supposed to be keeping their distance is a tall order. During the 2009 swine flu pandemic, families waited in long lines in parking lots and at health departments when their turn came up, crowding that authorities know they must avoid this time around.Operation Warp Speed, the Trump administration’s effort to speed vaccine manufacturing and distribution, is working out how to rapidly transport the right number of doses to wherever vaccinations are set to occur.Drive-through vaccinations, pop-up clinics and other innovative ideas are all on the table, said CDC’s Dr. Nancy Messonnier.As soon as a vaccine is declared effective, “we want to be able the next day, frankly, to start these programs,” Messonnier said. “It’s a long road.”___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content. 5581

When cruise lines begin sailing again, the Centers for Disease Control and Prevention has some guidance. The health agency issued their “framework for resuming safe and responsible cruise ship” operations Friday, ahead of the no-sail order expiring Saturday.The no-sail order, which originally began in April, prohibits cruise ships from carrying 250 passengers in waters subject to US jurisdiction.The CDC said it has identified at least 3,689 coronavirus-related illnesses, and 41 associated deaths, connected to cruise ships. Although the CDC cautions these figures are likely an underestimate.The framework urges a phased approach, and applies to ships that have the capacity to carry at least 250 passengers in waters subject to U.S. jurisdiction.“A phased approach is necessary because of the continued spread of the COVID-19 pandemic worldwide, risk of resurgence in countries that have suppressed transmission, ongoing concerns related to restarting of cruising internationally, and need for additional time for the cruise industry to test the effectiveness of measures to control potential COVID-19 transmission on board cruise ships with passengers without burdening public health,” a statement from the CDC reads.During the beginning, cruise line operators will have to demonstrate adherence to testing, quarantine and isolation plans, as well as social distancing requirements for passengers and crew members.The CDC says they will help by “establishing a laboratory team dedicated to cruise ships to provide information and oversight of COVID-19 testing,” updating instructions and creating a system to track ship status and passenger cases.Meanwhile, cruise lines will need to build out the capacity and ability to test crew and passengers on a regular basis.In their framework, the CDC says there may be simulated, or mock, voyages with volunteers to test cruise ship operators’ ability to apply COVID-19 mitigation measures.Although the no-sail order will be lifted, Carnival, Royal Caribbean and other cruise lines have already cancelled sailings until 2021. 2083

When a judge read the guilty verdict in the police shooting of unarmed black teen Jordan Edwards in Texas, the victim's family gasped and sobbed."Thank you Jesus," someone muttered as relatives embraced in the packed courtroom Tuesday.After hours of deliberations, a jury had found Roy Oliver guilty of murder in last year's shooting death of the 15-year-old in a Dallas suburb. The sentencing phase started after the verdict, and will resume Wednesday morning. 469

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