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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 pair of major Disney-released blockbusters, "Black Panther" and the upcoming "Mary Poppins Returns," join "A Star is Born" and a mix of smaller movies in the American Film Institute's annual roster of the most outstanding achievements in film and television.The juried awards, voted on by industry executives and producers, journalists and academics, also recognized "BlacKkKlansman," "Eighth Grade," "If Beale Street Could Talk," "The Favourite," "First Reformed," "Green Book" and another box-office hit, "A Quiet Place," in the film category.Although left off the 10-best list, Netflix's "Roma," the Spanish-language entry from director Alfonso Cuarón, was chosen to receive a special award as "a work of excellence outside the Institute's criteria for American film." To be eligible, movies must have "significant creative and/or production elements from the United States."On the television side, a separate jury recognized four series from the FX network: "The Americans," "Atlanta," and two shows from producer Ryan Murphy, "The Assassination of Gianni Versace: American Crime Story" and "Pose."Other honorees were spread among various players, including HBO's "Barry" and "Succession," Netflix's "The Kominsky Method," Amazon's "The Marvelous Mrs. Maisel," and AMC's "Better Call Saul." NBC's hit drama "This is Us" was the lone broadcast program to grace the list, while the most glaring oversights would be the past two Emmy winners for best drama, "Game of Thrones" and "The Handmaid's Tale."The AFI will honor the winners at a luncheon event in January. 1575

A starting point for investigators trying to trace the bombs sent to Democratic figures and CNN this week: the postmark.But in some cases, it appears to be a missing clue.The postmark typically indicates when and where the mail was sent from and is marked over the stamps -- "canceling" them, and preventing the stamps from being reused. Unlike stamps, most of which cannot be traced, the impression left by a postmark or mail meter is distinctive and can help investigators focus their search.A postmark is visible in a photo of at least one of the packages seen by CNN. A postmark is not visible in photos of several other packages shared with CNN -- only adding to the questions about their origins.The lack of a postmark is very rare, according to Nancy Pope of the National Postal Museum.A postal inspector who spoke to CNN on the condition of anonymity indicated it would be very unusual for a piece of mail to leave the facility where it was dropped off for delivery without such a mark.That could indicate that a sender or senders were working in multiple diverse geographical areas, including New York, Washington, Florida and California.Another source told CNN it is possible some of the stamps may not have been canceled because of the package's soft sides and odd shape, which would make it difficult to stamp.The US Postal Service's website also says mail may not be postmarked if it was processed through a meter or if the postage was paid by permit or precanceled stamp. None of those appear to apply to this situation.Adding to the mystery are post office markings on one of two packages sent to former Vice President Joe Biden indicating the stamps on the package did not cover the cost of the delivery, and additional postage is due.That suggests the package was weighed at some point during the shipping process, a former postal inspector told CNN.It was unclear from the photo whether that package had been postmarked.Postmarks can be applied by machine and by hand, depending on how a piece of mail is sent, according to the Postal Service. When mail is run through an automated system at a processing distribution center, the postmark is applied, and the mailed item is screened by a biohazard detection system.It was not clear why postmarks were not visible on several of the packages, and the US Postal Inspection Service provided a statement to CNN that did not address the question."The U.S. Postal Service has developed a comprehensive approach to protecting the mailsystem by utilizing a targeted strategy of specialized technology, screening protocols and employee training," read the statement.The statement noted its Dangerous Mail Investigations Program includes law enforcement officers who "are trained to recognize the common characteristics of suspicious mail and are highly proficient in the use of state-of-the-art equipment to include portable X-ray machines." 2907

A Southwest Airlines plane flying from Fort Lauderdale to BWI was hit by a pickup truck after landing at the airport.  It happened early Monday morning.   Passengers said the white truck crashed into the side of the plane on the runway.  An ambulance was at the scene, but according to passengers, no one was injured.  Passengers were not allowed to leave while crews continued their investigation.  Southwest Airlines has not released any comment but the company did respond to a tweet from one of the passengers on the plane.  A passenger named Michael Simon posted this tweet: "So our southwest flight just got into an accident with a pickup truck. Guess that makes me an airplane crash survivor."  874

A Minneapolis pi?ata maker is apologizing for hanging pieces of his work -- pi?atas which look like black people -- from the front porch of his house.The episode caused an uproar in his mostly African-American neighborhood after passersby mistook the pi?atas, which he says he hung up to dry, for a racist display.It all started when Victor Chavarria, owner of Happy Kids pi?atas, was filling an order for a wedding. The customer had requested racially diverse pi?atas that looked like members of their wedding party.So Chavarria got up at 4 a.m. Friday to create the papier-mache pi?atas, then hung them on the front porch of his home in northern Minneapolis to dry.Someone driving by his house that morning snapped a photo of the pi?atas and put it on Twitter.The social post soon brought a stream of threats to Chavarria, and even his wife and two toddlers.  874