郑州做眼睛近视手术至少要多少岁(郑州郑州医学院眼科) (今日更新中)

As Thousand Oaks comes to grips with the dual traumas of a deadly mass shooting and destructive wildfires, Brian Hynes will have to decide whether to reopen the Southern California bar where 12 people were killed.The Borderline Bar & Grill, the kind of place that comforted and supported the community in times of distress, is closed after a Marine veteran opened fire there last week in what authorities called a "horrific scene" before he apparently took his own life.Will the bar reopen? Hynes, the establishment's owner, said he knows how he'll come to a decision."With what Borderline is to ... my community, I don't know if (reopening) is going to feel right. But once I stand inside that building, it's going to be like going to my childhood home, and I'll know. I'll know then," he told CNN's Brooke Baldwin on Monday afternoon."There's no way I'm not going to reopen out of fear or anything like that. If it works, we will definitely reopen, but right now ... with the fires going on in our same community ... I'm trying to get people back in their home beds, with their pets and their families." 1117

As the nation debates on whether to reopen schools this fall, President Donald Trump said schools should “100%” be open this fall, despite concerns from educator unions and others over the spread of the coronavirus.During his coronavirus news conference on Wednesday, Trump was asked whether he planned on sending his son and grandchildren back to school this fall.“Yes, I am comfortable with that,” Trump said.“I would like to see the schools open. Open 100% and we will do it safely, we will do carefully but when you look at the statistics -- I just read having to do with children and safety ---- they are very impressive. They have very strong immune systems,” Trump added.Trump said that it is his belief that children are less likely to spread the virus. But research thus far has not been conclusive to back Trump’s claims.A study released from South Korea and published by the CDC found that while children under age 9 were less likely to spread the virus, youth ages 10 through 19 were just as likely as adults of spreading the virus.The study also found that closing schools in several Chinese cities, including Wuhan, showed that school closure and social distancing significantly reduced the rate of COVID-19 among contacts of school-aged children. “The role of household transmission of SARS-CoV-2 amid reopening of schools and loosening of social distancing underscores the need for a time-sensitive epidemiologic study to guide public health policy,” the researchers wrote.The American Federation of Teachers this week pointed toward a three-point plan that the US should implement for reopening schools.“Our plan details three conditions essential for schools to reopen,” wrote Randi Weingarten, president of the American Federation of Teachers. “First, the average daily community infection rate among those tested for the coronavirus must be very low. (New York Gov. Andrew Cuomo has required the rate not to exceed 5 percent for at least 14 days.) Second, schools must employ public health protocols, including 6-feet social distancing, masks, deep cleaning and handwashing stations. Third, adequate resources must be available to enact these safeguards, including funding for additional nurses, guidance counselors and teachers to reduce class size.”Weingarten said that Trump has politicized reopening schools, and she called on Congress to approve giving schools additional funding to reopen. Weingarten projects that it would take 6 billion nationwide to provide essential services for schools."Expenses have increased because of the fight against coronavirus," she said. "They not only need funds to provide essential services, the average school will need an additional .2 million, or ,300 per student, to open its doors safely." 2770

At 3 p.m. ET on Monday, November 26, a group of researchers will be really sweating. The NASA InSight spacecraft will try to land on Mars.After six months of flight, the lander component of the probe will detach itself from the cruise stage and head into the atmosphere. The lander component initially looks a fair bit like the re-entry capsule used in the 1960s and 1970s for the Apollo moon missions -- sort of conical, with a smooth and flat bottom. That bottom is a crucial heat shield that is designed to protect the probe as it passes through the thin Martian atmosphere.The landing is a devilishly difficult feat. The landing capsule has to batter its way through the atmosphere. It will fly through the Martian air at an initial speed of 12,300 mph, and it must hit the atmosphere at an angle of precisely 12 degrees. Any shallower, and the probe will bounce off into deep space. Any steeper, and the probe will burn itself up in a spectacular and fiery death. The probe will first touch the atmosphere six minutes and 45 seconds before landing. During this phase, it will experience acceleration 12 times that of the Earth's gravity. Were the probe a 150-pound human, during the flaming descent, it would weigh nearly a ton.About 3? minutes after the probe hits the atmosphere, a parachute will deploy, slowing down the probe even more. Fifteen seconds later, explosives will blow the heat shield off, exposing the actual InSight probe hidden inside. Ten seconds after the heat shield falls away, the probe will extend its legs, much like an airplane extends its wheels before touching down.The probe will fall for an additional two minutes attached to the parachute and protected by its conical shell. About 45 seconds before InSight lands, it will drop out of the shell and fall toward the surface. As soon as it leaves the shell, its landing rockets will ignite.The actual InSight probe looks a little bit like the Apollo moon lander, with three legs to support it and a boxy top. The rockets will slow it further and stop any remaining horizontal motion. Then, about 15 seconds before touchdown, the InSight probe will descend at a speed of 8 feet per second, before hopefully touching down gently on the Martian surface.The entire landing sequence will take about seven minutes to occur. A radio signal from Mars to Earth currently takes about eight minutes and seven seconds to get here. So the complete landing process will take place before we find out if it was successful. It will be done automatically, entirely by the probe itself. For the scientists and engineers who designed InSight, this is called "seven minutes of terror."And they are right to be worried. Mars is a graveyard of failed probes. There have been 44 attempts by various national space agencies to land on Mars. Eighteen have been successful. Twenty-three have not. Three have achieved orbit but failed at a landing.So, what does InSight hope to achieve? Well, as it happens, a lot. But it's different than the intrepid Curiosity probe, which NASA landed in 2012. InSight will not move around. Instead, it will stay put and tell us of the interior of Mars.One thing it will do is emit radio waves that we can monitor on Earth. By making careful measurements of how the frequency of the radio waves change, we will be able to measure the degree to which Mars wobbles as it rotates. That will tell us something about the core of the planet, specifically its makeup and information on the degree to which it is molten.InSight will also deploy a seismometer to listen for marsquakes (like earthquakes, but Martian-style) and for impacts of meteors on the planet. Information gleaned from the waves the seismometer detects will tell us more about the planet's interior.The third thing InSight will do is to dig below the planet's surface. Using a jackhammer, the probe will drill down 5 meters (16 feet) into the planet and, basically, it will take the planet's temperature.There are many reasons this is interesting. Taking the temperature at that depth will allow planetary scientists to determine how much heat is escaping from Mars. More broadly, this measurement will allow a clear determination of the temperature of the planet much closer to the core.This information will tell us a lot about how Mars formed, which, in turn, will add to the information of how rocky planets, including our own Earth, typically develop.And if you're more of an explorer kind of person and not so interested in Martian geology, it will also tell us how warm the planet is at modest depths, which will tell us if there is any chance of liquid water on the planet. Perhaps obviously, if the Martian subsurface is warm enough, any buried water will be in liquid form and not ice. Finding liquid water would be the key discovery that would make Martian exploration relatively easy. A relatively recent possible discovery of a buried Martian lake was promising, but the data was not conclusive. Knowing that the ground is warm would be very comforting to possible future explorers.Exploring the solar system is the first step toward exploring the stars. The InSight probe will give us --well -- insight into whether this is something that humanity will achieve in the foreseeable future.And maybe Elon Musk's bet on him getting to Mars will become true. 5329

Avocado pits as a dye? Well, that's precisely what Chipotle Mexican Grill is going to use on their new clothing and accessories line Chipotle Goods.According to a news release that was released Monday, the company will use the pits that are leftover from some of their restaurants that will be "upcycled" to create "natural avo dyed goods.""We know people are looking to celebrate their passion for Chipotle, and we set out to create a line of products with the same thoughtfulness, care, and attention to detail that we use in our kitchens," said Chris Brandt, Chipotle chief marketing officer in the news release. "With Chipotle Goods, our fans can get quality items that support sustainable agriculture and represent our mission of cultivating a better world."The gender-neutral collection will feature items like avocado lined jean jackets, avocado dyed t-shirts and sweatshirts, graphic tees that are customizable, which will allow fans to "select their ingredients as they do in the restaurant."To create the plant-based dye, the company said the pits would be simmered in water.The stains will vary in color, the company said."Each unique piece from the avo dyed collection requires five avocado pits, equivalent to five orders of guac, depending upon the season and size of the fruit," the fast-food chain said in the release.The line will be released to the general public on Tuesday and can be accessed by going to www.chipotlegoods.com. 1455

As summer winds down, doctors across the country are warning flu season is fast approaching. Many are watching Australia to see what may happen here when flu season arrives."Where Australia is obviously in the Southern Hemisphere, they're in winter while we’re in summer. We look at their flu season as kind of a six-month predictor of how ours is going to turn out," says Dr. Kenny Banh, the assistant dean of undergraduate medical education at UCSF-Fresno.The number of flu cases in Australia has taken a dramatic dip compared to last year. Dr. Banh says it's unclear if the U.S.'s flu rates will be as low as Australia's.A lot of it has to do with coronavirus precautions that people are taking, Banh hypothesizes."That's what we predict. It's not really so much a change in vaccination rates as much as the social distancing and all the preventative steps of coronavirus that are having the same effect of spreading any disease, including influenza," says Dr. Banh.Doctors say strict measures in Australia to protect people from COVID-19, such as physical distancing, wearing masks and hand washing, have helped prevent the spread of the virus and, incidentally, the flu. Now, some are wondering whether the United States will also see a drop in flu cases this winter."Seeing that they have a drop in influenza, we will certainly have a small influenza season. The issue is Australia is approaching, and the U.S. is approaching coronavirus very different. Their rates are different and they have a much lower per capita infection rate than we have in the U.S. for various reasons," says Dr. Banh.Australia has taken a broader, nationwide approach to protecting people against COVID-19, unlike in the United States, where each state has implemented different restrictions. That's one reason why Dr. Tanya Altmann with the American Academy of Pediatrics recommends every person, 6 months of age and older, gets a flu vaccine."I think this winter, it may be hard to differentiate between the flu and COVID-19 because so many of the symptoms-- cough, fever, aches, chills, are very similar. So by getting the flu vaccine and decreasing the chance your child has influenza, that will help us figure it out," says Dr. Altmann.Dr. Banh says Australia's plummeting flu rates and nationwide protective measures from COVID-19 will hopefully encourage many here in the United States to take the necessary precautions to keep everyone as healthy as possible this winter. 2470

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