宜宾一般光子嫩肤要多少钱(宜宾超声刀去眼袋) (今日更新中)

The fine print of newly released federal guidelines for reopening schools raises serious questions about whether in-person classes should resume at a time when COVID-19 rages around much of the country.Last week, the Centers for Disease Control and Prevention (CDC), under pressure from the White House, released a position paper highlighting “the importance of reopening America’s schools this fall.”But separate guidelines issued for K-12 school administrators, which drew less public attention, are much more cautious.“It is important to consider community transmission risk as schools reopen,” those CDC guidelines state.“Computer simulations from Europe have suggested the school reopenings may further increase transmission risk in communities where transmission is already high.”Buried at the bottom of the new CDC recommendation to re-open schools is a HUGE caveat! #COVID19 poses a low risk to kids “at least in areas with low community transmission.” That’s not where much of the country stands right now. 4/ pic.twitter.com/0D5CPxhlIb— Phil Williams (@NC5PhilWilliams) July 25, 2020 The new CDC guidelines suggest, “If community transmission levels cannot be decreased, school closure is an important consideration.”“Plans for virtual learning should be in place in the event of a school closure.”In Tennessee, several public and private schools are preparing to reopen even as almost every county in the state is showing what the Department of Health considers to be unacceptable rates of transmission of the coronavirus.Last week, the American Academy of Pediatrics issued a dramatic clarification of its statement back in June that "all policy considerations for the coming school year should start with a goal of having students physically present in school.""This does not mean that we recommend that all schools open five days a week from the start of the school year," the academy’s Dr. Sean O'Leary told a congressional committee.“Many parts of the country are currently experiencing uncontrolled spread of COVID-19. While the AAP urges those areas to make in-person learning as the goal, we recognize that many jurisdictions will need to utilize distance learning strategies until cases decline."The vice chair of the academy's committee on infectious diseases, O'Leary told the subcommittee that, where there is uncontrolled community transmission, "it's inevitable that the virus is going to get into the schools, and schools are going to have to shut down."U.S. Surgeon General Jerome M. Adams also told CBS This Morning last week that a community's COVID-19 transmission rate is the single most important determinant of whether schools can safely reopen.School reopening advocates point to the emotional, psychological and educational importance of children being in the classroom – a position that the CDC guidelines reaffirm.“Schools provide safe and supportive environments, structure and routines for children, as well as other needed support services to children and families,” the CDC notes.Children are less likely to become ill when infected with the virus, and younger children are less likely to transmit the virus to others, the report adds.But a large-scale study out of South Korea recently reported that children ages 10-19 -- middle- and high-school ages -- can spread the virus as easily as adults.Also, in searching citations in the new CDC recommendation to re-open schools, it appears to completely leave out the large-scale South Korea study that found teens are likely to spread #COVID19 as readily as adults 5/ https://t.co/ABLPvpKQU5— Phil Williams (@NC5PhilWilliams) July 25, 2020 In addition, a new study – shared by the Tennessee Department of Health last week on Twitter – concluded that “young, previously healthy adults can take a long time to recover from COVID-19.” 3828

The Geminid meteor shower peaks this week, so hope for clear skies that will let you see a beautiful show of green fireballs on Thursday and Friday. This will be the last -- and strongest -- meteor shower of the year, according to NASA.This phenomenon was first recorded in 1862 and causes a show each December.In the hours before sunrise Friday, the most meteors will be visible in the North American sky, peaking about 7:30 a.m. ET, predicts Sky & Telescope. To see when they will peak in your part of the world, check here.But the morning isn't your only chance. On Thursday and Friday, keep an eye on the sky a few hours after sunset -- just keep the moon at your back.Although the Geminid shower is known for its "shooting stars," the number of meteors visible depends on the time and how dark it is. There will be fewer of them earlier in the evening, but the shower should hit a maximum of about 100 per hour around 2 a.m., NASA said. For those in the suburbs, expect about 30 to 40 per hour. And if you're in a city like New York, San Francisco or Atlanta, you probably won't see anything.Early evening meteors may be longer, with dramatic streaks that last several seconds. Later on, the meteors will present quicker streaks or leave trails of smoke that appear to glow.The asteroid 3200 Phaethon is responsible for this meteor shower, which is unusual because comets usually create meteor showers with icy debris. Scientists have debated the very nature of what Phaethon is. The closely tracked near-Earth asteroid has been likened to comets, so it's been called a "rock comet."Phaethon was discovered in October 1983 and named after the Greek myth about the son of Helios, the sun god, because it closely approaches our sun.Phaethon orbits the sun closer than any other asteroid and takes 1.4 years to orbit it. The asteroid heats to about 1,300 degrees Fahrenheit on closest approach to the sun, which causes it to shed dusty debris.These particles cause the meteor shower when they plunge into Earth's atmosphere at 22 miles per second, vaporizing in the streaks we call "shooting stars."If you live in an urban area, you may want to drive to a place that isn't littered with city lights that will obstruct your view. If you're able to find an area unaffected by light pollution, meteors could be visible every couple of minutes from 10 p.m. until dawn.Find an open area with a wide view of the sky, and don't forget to bundle up. Make sure you have a chair or blanket so you can look straight up. And give your eyes about 20 to 30 minutes to adjust to the darkness -- without looking at your phone -- so meteors are easier to spot.While you're keeping an eye out for the meteor shower, you might see a small, foggy green patch in the sky, NASA said. That will be Comet 46P/Wirtanen, which is making its closest approach to Earth -- within 7 million miles -- for the next 20 years. And it will be visible to the naked eye. The comet is expected to come closest to Earth and peak Sunday. 3007

The Centers for Disease Control and Prevention was simply trying to warn Americans about the dangers posed by ticks and the diseases they spread. Instead, they ended up unintentionally ruining some of their followers' appetites.Tick-borne illnesses are on the rise, so the CDC has been pushing Americans to check for ticks after spending time outdoors. On Friday, the agency reminded its followers just how small those the pests can be, tweeting two photos of a poppy seed muffin."Ticks can be the size of a poppy seed. Can you spot all 5 ticks in this photo?" the CDC tweeted.  591

The Food and Drug Administration released updated safety standards Tuesday for makers of COVID-19 vaccines despite efforts by the White House to block them, clearing the way for requirements that are widely expected to prevent the introduction of a vaccine before Election Day.In the new guidelines posted on its website, the FDA said vaccine makers should follow trial participants for at least two months to rule out any major side effects before seeking emergency approval. That standard had been a sticking point between the FDA and White House officials, who said it could unreasonably delay the availability of COVID-19 vaccines.President Donald Trump has repeatedly insisted a vaccine could be authorized before Nov. 3, even though top government scientists working on the effort have said that timeline is very unlikely. On Monday Trump said vaccines are coming “momentarily,” in a video recorded after he returned to the White House.Former FDA officials have warned that public perception that a vaccine was being rushed out for political reasons could derail efforts to vaccinate millions of Americans.A senior administration official confirmed Monday that the White House had blocked FDA’s plans to formally publish the safety guidelines based on the two-month data requirement, arguing there was “no clinical or medical reason” for it.But on Tuesday, the FDA posted the guidance on its website, making clear that regulators plan to impose the safety standards for any vaccine seeking an expedited path to market.FDA Commissioner Stephen Hahn said in a statement that he hoped the guidelines would help “the public understand our science-based decision-making process that assures vaccine quality, safety and efficacy.”The requirements are aimed at companies seeking rapid approval through the FDA’s emergency authorization pathway. That accelerated process, reserved for health emergencies, allows medical products onto the market based on a lower bar than traditional FDA approval. But FDA has made clear only vaccines that are shown to be safe and effective will be authorized for coronavirus.Former FDA acting commissioner Dr. Stephen Ostroff said the requirements seem reasonable given the agency is in largely “uncharted territory” in terms of considering emergency use of a vaccine. The agency has only previously cleared one vaccine through the method — a decades-old shot that was authorized to prevent anthrax poisoning in 2005.“There really is no margin for error here,” Ostroff said. “Even when you’re talking about limited use of a vaccine there has to be some level of assurance that there isn’t a risk here that would far outweigh the benefit.”Dr. Peter Marks, the head of FDA’s vaccine division, said Tuesday that the two-month follow-up requirement was chosen to be “something reasonably aggressive, but not too conservative — right in the middle.” He spoke at a symposium organized by Johns Hopkins University.Initial doses of vaccines for emergency use would likely be reserved for medical workers and people with health conditions that make them particularly vulnerable to coronavirus. Full FDA approval for the general population will require significantly more data and is not expected until mid-2021.The White House attempt to block the guidance followed a string of instances in which the Trump administration has undercut its own medical experts working to combat the pandemic. FDA’s Hahn has been attempting to shore up public confidence in the vaccine review process for weeks, vowing that career scientists, not politicians, will decide if the shots are safe and effective.Pfizer CEO Albert Bourla has stoked excitement by saying that he expects data on whether the company’s candidate works to be ready in late October. But a number of variables would still have to align for the company to submit, and the FDA to review and greenlight, a vaccine application before Nov. 3. Pfizer’s competitors Moderna, AstraZeneca and Johnson & Johnson are working on longer research timelines.Vaccine development typically takes years, but the U.S. government has invested billions in efforts to accelerate the process and help multiple drugmakers prepare multiple candidates. All the doses will be purchased by the federal government for use vaccinating the U.S. population.Beyond exposing the rift between the White House and FDA, the delay in releasing the guidelines may have had limited practical effect.FDA scientists have been discussing the guidelines publicly for weeks and have made clear that the recommendations have already been shared with each of the vaccine developers.Former FDA Commissioner Scott Gottlieb said Tuesday that drugmakers depend on the FDA’s science-based endorsement to vouch for the safety and effectiveness of their products.“I can’t imagine a circumstance where a sponsor would challenge or seek to undermine the FDA’s role here,” Gottlieb said at the COVID-19 symposium. “This is precisely the moment when we need an objective, neutral arbiter.”Last week, Gottlieb and six other former FDA commissioners blasted the Trump administration for “undermining the credibility” of the agency in a op-ed calling for the release of the then-stalled vaccine guidelines.“Scientists should make decisions based on data, unfettered by political pressure or the intrusions of ideology or vested interests,” the officials wrote.___AP Medical Writer Lauran Neergaard contributed to this report.___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. 5644

The calendar is about to flip from April to May, and normally storm chasers are flooding Tornado Alley to get a glimpse at the power of Mother Nature. But so far in 2018, there has not been much to chase. According to the National Weather Service, the state of Oklahoma, which is in the heart of Tornado Alley, has gone the entire year so far without a single confirmed tornado touchdown. Not since before 1950 has Oklahoma gone the first four months without a single tornado touchdown. By the end of April, the state would have averaged 17 tornado touchdowns. Last year, 13 tornadoes had touched down by the end of April. In 2016, there were 27 touchdowns in the month of April alone. In 2012, there were 54 confirmed touchdowns in April. The state of Kansas has also gone the entire year without a tornado. According to National Weather Service data, the state averages 12 tornadoes in the month of April alone. "On the whole, across the United States, we have seen around half the number of eyewitnessed tornado reports that we would normally expect by this time of year," Dr. Patrick Marsh, a meteorologist at the Storm Prediction Center, told CNN. Meteorologists are blaming, or crediting, a jet stream pattern that has sent big snow storms into the Upper Midwest for the decreased number of tornadoes. The pattern has prevented warm moist air from setting up in the Plains, which has cut off any fuel for potential tornadoes. According to the Storm Prediction Center, the upcoming weekend appears to void of any major severe weather outbreaks. The next potential for severe storms could setup in the Plains on Tuesday and Wednesday.  1692

来源：资阳报