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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

A motorcade escorting Vice President Mike Pence to a series events near Pittsburgh was involved in two accidents on Thursday, according to reporters in the press pool.Reporters for NBC News and Newsmax say that after Pence arrived at a Western Pennsylvania airport, a Trump campaign bus was involved in a "minor accident" with a dump truck. Though the Vice President was aboard the bus at the time of the accident, he was unhurt. Pence immediately left the bus and moved to a limo.Later, the outlets report that two motorcycles in the motorcade were involved in an accident. Neither driver was injured, and the motorcade was again on the move shortly after.On Thursday, Pence tweeted his thanks to all law enforcement officers involved in his motorcade. 761

A volunteer in the AstraZeneca COVID-19 vaccine trial in Brazil has reportedly died.According to Bloomberg, the participant hadn't received the company's vaccine, but it's unclear how they died.Brazilian outlet Globo reported that the volunteer was a 28-year-old doctor from Rio de Janeiro who'd been working as a COVID-19 frontline worker.Reuters reported that Anvisa, Brazil's National Health Surveillance Agency, said the trial would continue but did not provide any further details.Following the news, AstraZeneca shares dropped about 1%, CNBC reported.AstraZeneca's trial has been on hold since Sept. 8, after an unexplained illness popped up in a patient in the United Kingdom.According to Reuters, AstraZeneca plans to resume its trial sometime this week. 770

A recent Gallup Poll shows President Donald Trump’s approval ratings continue to slip after the November election. Americans’ satisfaction with the direction of the country and approval of Congress are also trending down.Right before the election, a Gallup Poll on job approval showed 45% approved of President Trump. Then, a poll taken in the two weeks immediately following the November presidential election, showed Trump with a 42% job approval rating.That number has now slipped to 39%, according to the latest Gallup Poll taken during the first two weeks of December. The president’s approval rating has stayed between 35-49% over the course of his presidency.The highest favorability rating President Trump has received during his presidency was 49% in April as the country was in the initial stages of the coronavirus pandemic.As for how participants are feeling about Congress, in November, the Gallup Poll showed 23% had a favorable view of how Congress was doing. That number dropped to 15% in December. Notably, the poll was taken before a large coronavirus relief package and government spending bill passed both houses of Congress.The lowest Gallup has recorded for job approval of Congress was 9% in November 2013.There was a similar drop in how survey participants feel about the direction of the U.S., with 28% feeling satisfied in the direction of the country in October, then only 21% feeling satisfied in November, and 16% satisfied in December. The lowest level of satisfaction in the direction of the country this year was in July, when it was only 13%.“This overall decline is driven primarily by Republicans, whose satisfaction fell from 60% in Gallup's final preelection measure in October to 22% in the most recent poll, likely a reaction to the election outcome,” the Gallup Poll analysis states.Meanwhile, Gallup Poll’s surveys show approval ratings are ticking upward for President-elect Joe Biden. He had a 48% approval before the election, then 55% job approval rating in the weeks after the election. In the December poll, his job approval rating during the transition went up to 65%.Gallup says Biden’s bump in favorability is in line with trends they have seen after presidential elections since 2000.Meanwhile, ratings for losing presidential candidates in Gallup’s poll have been mixed over the years; John McCain and Mitt Romney saw a higher rating post-election, and Hillary Clinton’s rating was unchanged after the 2016 election. 2476

A van covered in conservative political bumper stickers parked nearby where a suspect was arrested in connection with a series of package bombs sent to liberal politicians and donors was taken into police custody Friday.The van was plastered with large stickers in support of President Trump. It also included a sticker of Hillary Clinton in a sniper's crosshairs and a "CNN Sucks!" sticker.Police covered the van in a tarp and drove it to a nearby facility.It's unclear if the van belongs to Cesar Sayoc, the man arrested in connection with the package bombs, though it was located in a parking lot of the same auto parts store in which Sayoc was arrested.At least 12 package bombs were sent to liberal politicians and donors this week. None of the bombs exploded and no one was injured.  807