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发布时间: 2025-06-02 07:24:27北京青年报社官方账号
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As health experts warn about rising coronavirus cases from spread at indoor gatherings, a new website backed by recent research is trying to help people understand just how many people in what size space is risky for infection. Which could come in handy as some people consider small holiday gatherings.It’s more risky to be in a small room compared to a large gym. If people are calm and quiet, it is safer than singing or exercising no matter how distant they are.Given these types of scenarios, and the “rapidly advancing science” of how COVID-19 droplets behave, scientists at the Massachusetts Institute of Technology created the COVID-19 Indoor Safety Guideline application.Here’s an example:An average suburban house that is 2,000 square feet, with 25 people inside wearing cotton masks and talking in a whisper, can reduce their risk of transmission by only staying inside for 4 hours.If those same 25 people, in the same house, are not wearing a mask and are talking normally, the length of time to reduce transmission drops to just 50 minutes.And if those 25 people, in the same house, are singing along to Christmas music, without masks on, that time to safely reduce COVID-19 transmission indoors drops even further to just 8 minutes.If the size of the gathering is only 5 people, and there is still singing, no mask wearing, and it’s still a 2,000 square foot house, it becomes unsafe after just 27 minutes.The MIT website offers users the ability to select room size, number of people and length of time, then using previous research and scientific knowledge of airborne viruses, it predicts the risk of the indoor event. Users can change elements of the situation, like room size, mask wearing, ventilation, etc.Click here to visit the Indoor Safety Guideline website.In a restaurant, to reduce transmission, 50 people without masks and talking normally should stay for only two hours. If the restaurant has 100 people, to reduce transmission risk, they should only remain inside for 64 minutes.The researchers note current general social distancing guidelines (remain 6 feet apart) suggest 138 people would reduce their risk in the same size of space for an indefinite amount of time.Another example, a Boeing 737, the researchers’ model predicts 100 people can be onboard a 737 wearing masks and still reduce their risk of transmission by staying onboard less than 6 hours.The CDC updated their guidance about COVID-19 this fall, acknowledging ongoing research that shows coronavirus droplets “can remain suspended for many minutes to hours (in the air) and travel far from the source on air currents.”The Centers for Disease Control and Prevention also says coronavirus droplets can remain even when an infected person has left the room and can travel farther than six feet. 2800

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As a new work week begins, many are wondering if Atlanta is back to full speed following a cyberattack on the city's computer systems last week.It all depends on the department. Some departments were not affected at all by the cyberattack, while employees in others are still not able to turn on their computers.The fire and police departments were not affected at all by the ransomware attack. The same goes for the public works department, housing authority and Hartsfield-Jackson International Airport, although the airport has suspended its Wi-fi services, just in case.But other departments have been forced to conduct businesses the old-fashioned way, by using pen and paper.For example, if you have an issue with trash pickup, traffic signals and potholes, you'll have to resolve it over the phone. Also, the city jail is having to process inmates manually.Business owner Marcus Woodard was among the people turned away Monday at Atlanta City Hall. He was looking to renew his business license but the computers are still down."I commuted all this way to get it, and now I've got to come back tomorrow or the day after," said Woodard.On the other hand, Doug Lueder walked out a happy man after his application to have a commercial property subdivided was handled."I had to turn in an application last week just before the cyberattack happened, so I got in and got out," said Lueder. "Today, I was just turning in my notarized sign posting affidavit so that went pretty easy also, so all in all, I got out pretty easy."Atlanta Mayor Keisha Lance Bottoms provided an update on city services and says people may want to check ahead to see which services are available.CBS46 spoke with cyber security expert Alex DeFreese and he says it's malicious software that takes over a computer or a system and encrypts it."You can't access the contents unless you have the key," says DeFreese. "And then they take that key and they ship it back to their servers and they hold the information and the systems and the drives and whatever ransom until you either manage to revert from a backup or pay them however much they're asking for it."It all started Thursday morning around 5:40 a.m. when the city of Atlanta official Twitter account sent out a tweet saying:“The City of Atlanta is currently experiencing outages on various customer-facing applications, including some that customers may use to pay bills or access court-related information. Our @ATL_AIM team is working diligently with support from Microsoft to resolve this issue. Atlantaga.gov remains accessible. We will post any updates as we receive them. Thank you for your patience.”The hackers sent a note listing their demands and instructions that read:-Send .8 bitcoins for each computer or 6 bitcoins for all of the computers. (the equivalent of around ,000)-After the .8 bitcoin is sent, leave a comment on their website with the provided host name-They'll then reply to the comment with a decryption software. When you run that all of the encrypted files will be recovered.City officials have not said if they'll pay the ransom.The FBI is investigating.  3133

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Another migrant caravan bound for the U.S.-Mexico border is forming in Central America, and federal officials in the United States are keeping their eyes on it, an official with the Department of Homeland Security told CNN on Tuesday.More than 500 people are using four groups in the mobile messaging service WhatsApp to organize a caravan that matches the description of the one the Trump administration is monitoring, CNN has learned.The migrants plan to leave at 9 a.m. on October 31, from El Salvador's capital, San Salvador. NBC first reported the DHS tracking and the group's expected departure point. 615

  

Army Specialist Vanessa Guillén murder has captivated the nation. The body of the 20-year-old was found only weeks ago, but her death is already prompting Congress to debate how harassment is handled in the military. Vanessa Guillén's Death There are still a lot of unknowns regarding why Guillén was killed but Army investigators have said it is possible she was a victim of harassment prior to her death. Guillén's family believes strongly that she was a victim. In terms of arrests, Cecily Aguilar has been charged with one count of conspiracy to tamper with evidence.Army Specialist Aaron Robinson killed himself when he was approached by police. Aguilar is Robinson's estranged wife. #IamVanessaGuillen movementAcross the country online, women have shared their stories of harassment in the military. The viral movement has raised awareness about the military's sexual harassment policy and prompted a bill to be introduced in Congress. 950

  

As hundreds of stores are closing their doors permanently across the country, Dollar General is announcing the opening of new locations of a spin-off concept, Popshelf.The Popshelf stores will carry seasonal home decor, health and beauty products, cleaning supplies and party goods, with about 95 percent of the items or less, according to a release from the company.At popshelf, customers will find a differentiated retail concept that seeks to bring joy to their shopping experiences, with surprising deals in targeted non-consumable product categories. We are excited to welcome customers into these stores,” said Emily Taylor, Dollar General’s executive vice president and chief merchandising officer.Popshelf stores will focus on “continually-refreshed merchandise, seasonal specials and limited-time items,” while also carrying products from Dollar General’s store brand. 888

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