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A police officer in Prince George's County was shot and killed while trying to protect a woman in a domestic situation on Wednesday??????The ABC station in D.C. reported that a woman called police saying that her husband had shot a police officer. When officers responded, the woman gave the description of the car her husband was driving, which led police on a chase. During the chase, it is reported that the suspect shot at police, who returned fire. Prince George’s County Police announced on Twitter that the officer had died.With broken hearts, we are announcing that one of our officers was shot and killed today. The brave officer was shot while stepping in to protect a woman threatened in a domestic situation. Please keep his family and our department in your prayers.— PGPDNEWS (@PGPDNews) February 21, 2018 847

A tweet by horror novelist Stephen King is getting a lot of attention on Twitter after he commented on the death of Mollie Tibbetts and Stephen Paddock, who killed 58 people in Las Vegas during the Route 91 Harvest festival. 232

A teacher at Dickson Intermediate School in Tennessee launched an emergency lunch money fund for students after an interaction with one child inspired her to help children in need."As I was walking through the cafeteria one day, I saw a child with no tray and no drink just stopped to build those relationships as teacher do, and just asked are you not eating? Do you need something?" said sixth grade literary teacher Julie Potter. "His comment was mom said we’re out of money so I can’t eat today."Potter told the student to grab lunch, on her.But she said she realized that was a short term solution."I thought if I could just donate just a few dollars to set up an account so the next time, the next child will feel safe enough to go through the line without worrying about pride and be fed," Potter said.So Potter put out a post on Facebook, detailing her interaction with the student and a plan to help others."I share this message to say I would like to set up a special lunch account called 1 in 4," the post read. "This account would be for those students, just a handful and only as needed, we see going without food. An account where we as school staff could quietly say, 'Go through the line and it will be taken care of.'"In just 10 days, teachers and parents have donated to the fund and two students have used the emergency money to eat.And while Dickson Intermediate never turns away a hungry student, officials said this helps further break down barriers."Some are going to feel a little embarrassed or shy about asking for help," said School Nutrition Supervisor Jason Collins. "That’s why I think it’s so important that we focus on building those relationships."According to Feed America about one in four children in Dickson County are food insecure but don't qualify for federal assistance.If you'd like to donate to Dickson Intermediate's fund you can drop money off at the school's front office or mail it to the school. Please specify that your donation is for the 1 in 4 lunch account. 2063

A van slammed into a crowd Saturday in an apparently deliberate act in the German city of Muenster, killing two people and leaving 20 others injured, officials said.The driver also shot and killed himself, a police spokeswoman said. The driver was a German citizen, said Herbert Reul, state minister for internal affairs in North Rhine-Westphalia state.Authorities are treating the incident as an attack. There is no known connection to radical Islam but investigators are still looking into the driver's background, Reul said.Police earlier said there were three deaths. Reul clarified later Saturday that the total included the attacker.Muenster police spokesman Andreas Bode said law enforcement is looking into witness reports that some people fled the attacker's van after the attack. He also said there was a suspicious object in the vehicle that was under investigation.Bode said the motive of the driver is unknown.The attack happened in the old part of the western German city, an area popular on weekends. It was a warm sunny afternoon, one of the first nice days of spring, and many people were out in the area with its narrow streets, Bild editor Julian Reichelt told CNN.German Chancellor Angela Merkel said she is "deeply shocked by the terrible events in Muenster."In a statement tweeted by German government spokeswoman Ulrike Demmer, Merkel said "everything is now being done to clarify the act and support the victims and their families."The driver drove a vehicle into a restaurant's open terrace around 3:30 p.m. local time, according to police spokeswoman Vanessa Arlt.Arlt said the old city remains closed, and police have asked people to avoid the city center.Muenster, with about 300,000 people, is home to numerous universities and has a student population of about 58,000, the city government says. The city calls itself the cycling capital of Germany and says about 100,000 residents use a bike daily."With dismay, I learned of the terrible incident in Muenster," Interior Minister Horst Seehofer said in a statement, adding, "Police in Muenster and throughout (the state of North Rhine-Westphalia) are now working hard to investigate the matter."Federal authorities are in close contact with local officials, Seehofer said.The White House sent condolences in a statement from press secretary Sarah Sanders."Our thoughts and prayers go out to the families of those killed and we wish a full recovery to those injured. While the German authorities have not yet announced a motive for this cowardly attack on innocent people, we condemn it regardless, and pledge any support from the United States government that Germany may need."Saturday's crash occurred on the one-year anniversary of a similar attack in Stockholm, Sweden, when a stolen beer truck struck pedestrians, killing five people. 2826

A subject coughing in a cyclic incident. Top view of airborne droplet transmission with and without wearing a surgical mask. The top and bottom figures show the results at 4 s and 5 s, respectively. We consider a surgical mask that exhibits an initial efficiency of ～91%. The cover does not prevent the transport of the saliva droplets entirely away from the subject. Many droplets penetrate the mask shield and some saliva droplet disease-carrier particles can travel more than 1.2 m. For visualization, the droplets were scaled by a factor of 600 compared to their actual size. The environmental conditions are zero wind speed, ambient temperature 20 °C, pressure 1 atm, and relative humidity 50%. The mouth temperature is 34 °C, and the face skin temperature is 32 °C. 779

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