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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 new US government report delivers a dire warning about climate change and its devastating impacts, saying the economy could lose hundreds of billions of dollars by the end of the century.The federally mandated study was supposed to come out in December but was released by the Trump administration on Friday, at a time when many Americans are on a long holiday weekend, distracted by family and shopping.David Easterling, director of the Technical Support Unit at the NOAA National Centers for Environmental Information, emphasized that there was "no external interference in the report's development." He added that the climate change the Earth is experiencing is unlike any other."The global average temperature is much higher and is rising more rapidly than anything modern civilization has experienced, and this warming trend can only be explained by human activities," Easterling said.Coming from the US Global Change Research Program, a team of 13 federal agencies, the Fourth National Climate Assessment was put together with the help of 1,000 people, including 300 leading scientists, roughly half from outside the government.It's the second of two volumes. The first, released in November 2017, concluded that there is "no convincing alternative explanation" for the changing climate other than "human activities, especially emissions of greenhouse gases."The report's findings run counter to President Donald Trump's consistent message that climate change is a hoax. On Wednesday, Trump tweeted, "Whatever happened to Global Warming?" as some Americans faced the coldest Thanksgiving in over a century.But the science explained in these and other federal government reports is clear: Climate change is not disproved by the extreme weather of one day or a week; it's demonstrated by long-term trends. Humans are living with the warmest temperatures in modern history. Even if the best-case scenario were to happen and greenhouse gas emissions were to drop to nothing, the world is on track to warm 1.1 degrees Fahrenheit.As of now, not a single G20 country is meeting climate targets, research shows.Without significant reductions in greenhouse emissions, the annual average global temperature could increase 9 degrees Fahrenheit (5 Celsius) or more by the end of this century, compared with preindustrial temperatures, the report says. 2355

A New Jersey man who died of a brain-eating infection called primary amebic meningoencephalitis was exposed while visiting the BSR Cable Park and Surf Resort in Waco, Texas, during the summer, the Waco-McLennan County Public Health District said Friday.Water samples taken by local, state and federal health officials at the beginning of the month "found evidence of Naegleria fowleri," the amoeba that causes the infection, according to the health district.Fabrizio Stabile, 29, visited the surf resort before developing symptoms in September.A GoFundMe page launched by those close to him said he was mowing his lawn when he developed a severe headache. It hadn't gone away by the following morning, and his symptoms progressed until he was unable to speak coherently or get out of bed. He was rushed to the hospital, where doctors found the amoeba in his spinal fluid. "The worst-case scenario was unfolding in front of our eyes," the site says.The health department concluded, "epidemiologic and environmental assessment indicate that exposure likely occurred at this facility."Although the amoeba itself was not found in water samples from the park, "the presence of fecal indicator organisms, high turbidity, low free chlorine levels, and other ameba that occur along with N. fowleri indicate conditions favorable for N. fowleri growth."The tests were taken from the park's Surf Resort, Royal Flush and Lazy River features. Those areas are to remain closed until "all health and safety issues have been addressed and mitigated appropriately," the health department said, adding that the owner of the park is cooperating and working to develop a "comprehensive water quality management plan to include current regulatory requirements."The BSR Cable Park said on its website that it is installing a state-of-the-art filtration system on the three features to ensure that they are "as clear and clean as humanly possible."However, the park is interpreting the test results another way: "Water tests come back clean," the website proclaimed, adding that "comprehensive test results have now confirmed that the water at BSR Surf Resort meets every standard for safety."BSR also offered its condolences: "On behalf of the entire staff at BSR Surf Resort, our hearts and prayers are with Fab Stabile's family, friends, and the New Jersey surf community. A precious life has been lost, and we are deeply saddened for his loved ones."There have been nine cases of primary amebic meningoencephalitis in Texas since 2005, according to the Waco-McLennan County Public Health District. Centers and Disease Control and Prevention data dating to the 1960s show between zero and eight cases per year nationwide, with five cases in 2016, none last year and no other cases reported this year.The amoeba, Naegleria fowleri, is found in warm bodies of fresh water such as lakes and hot springs. It infects people by entering the nose and making its way to the brain. There, it can cause a brain infection that the CDC calls "rare and devastating," known as primary amebic meningoencephalitis. It is almost always fatal, though a handful of people have survived.Health officials recommend keeping water out of your nose while swimming in warm or untreated freshwater, by either holding your nose, keeping it above water or using a nose clip. 3359

A man was arrested after he broke into a Long Island home posing as a Nassau County police officer Friday evening.Robert White, 48, forced his way into the victim’s second floor bedroom apartment around 6:30 p.m., police said.When he entered the apartment, he told the victim, 21, he was an officer and was there to collect rent money. He threatened the victim would be arrested if he did not comply, authorities said.The victim handed White an undisclosed amount of money, police said.White was later taken into custody and was charged with second-degree burglary, two counts of grand larceny and criminal impersonation. 629

A Mississippi school district has apologized and a high school band director has been suspended after the band staged a halftime skit that depicted police being held at gunpoint.The controversial skit came as the Forest Hill High School band from Jackson performed Friday during a football game against Brookhaven High School to the south. It shocked many at the game in Brookhaven, where just six days earlier two police officers were killed in a shootout with a suspect."I was sad because of what happened last weekend, and it felt like they were making fun of it," Sarah McDonald, a Brookhaven High School student, told CNN affiliate WJTV.A woman who said she was a graduate of Brookhaven High School found the performance insensitive."I was shocked by the halftime performance just because of everything that our community is going through," the woman told CNN affiliate WLBT. "No disrespect to Forest Hill, when they decided to do a performance, they should've took that into consideration that we were already going through a lot at this time. We are still trying to figure out what needs to be done about the situation." 1135