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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 Tennessee woman was behind a security threat that placed the White House on lockdown.The vehicle that rammed the security gate Friday afternoon is registered to Jessica R. Ford, a woman who has had run-ins with Secret Service in the past. The car also had Rutherford County tags.The incident report says Ford intentionally hit the fixed security barrier with her car while holding a gun in her hand behind the wheel.According to the report, Ford hit the gate, and continued to accelerate, while an officer demanded she put the gun down multiple times. Witnesses reported seeing smoke from her vehicle's tires.When she did not comply,  the officer removed the gun from hand before she was pulled from behind the steering wheel.Once they pulled her out of the driver's side window, they handcuffed her and searched the vehicle.The White House was placed on lockdown for about an hour during the investigation. The Secret Service confirmed no shots were fired during the incident, and no law enforcement personnel were injured.President Trump was inside the White House at the time, hosting Australian Prime Minister Malcolm Turnbull. Turnbull remained at the White House as the incident was being investigated.The incident wasn't Ford's first run-in with secret service. According to reports, Ford tried to get past security and scale a fence at the White House in April, May and July of 2017.  She was arrested and charged with unlawful entry and ordered to stay away from the White House grounds.Ford has a lengthy criminal history in Tennessee as well. In 2003, she was charged with DUI and prescription fraud. From 2004 to 2006 she was charged with multiple counts of violation of probation and resisting arrest. In 2011,  in Nashville she was charged with criminal trespassing.The Secret Services said Ford is now facing multiple charges in connection to Friday's incident including Unlawful Entry, Carrying a Pistol without a License, and Destruction of Government Property.Learn more about Friday's incident here. 2113

A Virginia woman's exercise of free speech cost her a job and healthcare coverage. But she says anonymous friends online have helped lift her "heavy burdens."Juli Briskman was fired from her job on Oct. 31 after a photo of her flipping off President Trump's motorcade while riding a bicycle went viral.Last week, after the story of Briskman's termination made national news, a GoFundMe page was set up by someone who described her as "an inspiration to us all." 479

A new warning Tuesday cautions toxic chemicals were discovered in several popular back-to-school items. Everything from crayons and markers, to binders and water bottles.The U.S. Public Interest Research (USPIRG) groups tested 27 school supplies and found that some of them contained toxic chemicals like asbestos, lead, benzine and phthalates, which have been linked to cancer and other health hazards.“You can't assume that things are automatically safe when they're on our store shelves,” says Danny Katz, with USPIRG.Katz's team found Playskool crayon from Dollar Tree had trace amounts of asbestos. But that wasn't it.A blue jot band binder from Dollar Tree tested positive for phthalates.  Additionally, dry erase markers from Amazon tested positive for benzine, even though the packaging says nontoxic.“Just because a product says nontoxic like that, doesn't mean it's been tested for all the different chemicals,” Katz explains.Katz says what you should look for is a symbol, which confirms the product has been tested and approved by the Consumer Product Safety Commission.His team has put together a list for parents and teachers of products that tested positive for toxic chemicals and those that didn't.“There's just no reason that these chemicals need to be in the school supplies,” Katz says. “There's plenty of school supplies that don't have them. So we're shining a spotlight on which ones have these toxic chemicals which ones we didn't find in helping teachers and parents to stay safe.”  1535

A man’s love for man’s best friend is a powerful force. Kaleb Benham from Grass Valley took on a 350 pound bear that was attacking his rescue dog, “Buddy.” Kaleb said he heard a growl the saw the bear dragging buddy “by his head.” So he tackled the bear and punched it pic.twitter.com/XAhTrS2AEC— Anna Giles (@AnnaGilesTV) December 4, 2020 347