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A subject coughing in a cyclic incident. A qualitative examination of airborne droplet transmission with and without wearing a surgical mask. The top and bottom figures show the results at 2 s and 3 s, respectively. Wearing a surgical mask that exhibits an initial efficiency of ～91%. This cannot prevent the transport of the saliva droplets 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. 775

A strong winter storm moving over the eastern half of the country has claimed at least eight lives and knocked out power for tens of thousands of people.A turbulent mix of rain, snow and ice that initially hit the Midwest caused havoc from the south to the northeast Thursday. It prompted school closures, hours-long delays for commuters and hundreds of flight cancellations.This early season winter storm will bring more snow, sleet and freezing rain in the Central Appalachians through the Northeast on Friday. Heavy snowfall is expected Friday in the northern Mid-Atlantic and Northeast states. In portions of Pennsylvania and New England, residents could see snowfall totals of 6 to 12 inches, the National Weather Service said.More than 292,000 customers were without power early Friday morning in Indiana, Kentucky, Ohio, Virginia, West Virginia and Pennsylvania, according to Poweroutage.us. 906

A recent string of extremist attacks highlights an alarming trend: a growing number of hate crimes across the country.In fact, it’s up for the fourth year in a row in most major cities, according to Brian Levin, who studies hate crimes. Levin says one possible reason for the most recent spike of attacks is the midterm elections.“We're a very polarized society,” says Levin, who works at the Center for the Study of Hate and Extremism. “We're not only divided, but we're entrenched in that division.”Experts say hotly contested political races can cause a jump in hate crimes. It happened around the 2016 presidential election.“November of that year was the worst month of 14 years, going back to the first anniversary of 9/11,” Levin says.Just this week, attorneys for three men accused of planning to bomb a mosque the day after Donald Trump became president say his rhetoric during the campaign inspired the men.Now that he's president, others worry his words could motivate others.At a recent rally, President Trump stated, “You know what? I am; I'm a nationalist, okay.“But you also had people that were very fine people, on both sides.”Professor Carolyn Gallaher at American University believes this rhetoric has consequences.“In white supremacist circles, they took this to mean this person supports us and we have a champion in the White House and we can fight for a white America.”The president and his administration deny he intentionally incites violence. 1475

A person with knowledge of the punishment tells The Associated Press that at least three NFL coaches and their teams have been fined because their coaches weren't wearing face coverings on the sidelines at all times. The person says the three coaches who were fined are Vic Fangio of the Denver Broncos, Pete Carroll of the Seattle Seahawks and Kyle Shanahan of the San Francisco 49ers. The coaches were fined 0,000 each and their teams 0,000 each. Other fines could be coming as several other coaches violated the rules a week after the league sent out a memo reminding them to wear face coverings over their noses and mouths to protect against the spread of the coronavirus. 690

A San Francisco lawmaker has introduced an ordinance that would make it illegal to make a racially-biased 911 call within the city limits.According to KPIX-TV in San Francisco and The Los Angeles Times, San Francisco City Supervisor Shamann Walton introduced the "Caution Against Racially Exploitative Non-Emergencies (CAREN) Act" on Tuesday.The CAREN acronym is a play on the name "Karen" — the name social media users often label those who make racially-based 911 calls in viral videos.In a statement to NBC, Walton said that the act would "make it unlawful for an individual to contact law enforcement solely to discriminate on the basis of a person's race, ethnicity, religious affiliation, gender, sexual orientation, or gender identity."The proposed legislation is similar to a bill currently making its way through the California State Assembly. That bill, AB 1550, was introduced by Assemblyman Rob Bonta (D-Oakland)."Using 911 as a tool for your prejudice towards marginalized communities is unjust and wrong!" Bonta tweeted earlier this week. 1060

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