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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 tense moment, after a 30-minute rescue attempt, as our beaver crawls up our make-shift ramp to safety! pic.twitter.com/6mP4qiUTY1— Southlake DPS (@SouthlakeDPS) November 1, 2020 187

A mysterious cigar-shaped object spotted tumbling through our solar system last year may have been an alien spacecraft sent to investigate Earth, astronomers from Harvard University have suggested.The object, nicknamed 'Oumuamua, meaning "a messenger that reaches out from the distant past" in Hawaiian, was first discovered in October 2017 by the Pan-STARRS 1 telescope in Hawaii.Since its discovery, scientists have been at odds to explain its unusual features and precise origins, with researchers first calling it a comet and then an asteroid, before finally deeming it the first of its kind: a new class of "interstellar objects."Now, a new paper by researchers at the Harvard Smithsonian Center for Astrophysics raises the possibility that the elongated dark-red object, which is 10 times as long as it is wide and traveling at speeds of 196,000 mph, might have an "artificial origin.""'Oumuamua may be a fully operational probe sent intentionally to Earth vicinity by an alien civilization," they wrote in the paper, which has been submitted to the Astrophysical Journal Letters.The theory is based on the object's "excess acceleration," or its unexpected boost in speed as it traveled through and ultimately out of our solar system in January 2018."Considering an artificial origin, one possibility is that 'Oumuamua is a light sail, floating in interstellar space as a debris from an advanced technological equipment," wrote the paper's authors, suggesting that the object could be propelled by solar radiation.The paper, written by Abraham Loeb, professor and chair of astronomy, and Shmuel Bialy, a postdoctoral scholar, at the Harvard Smithsonian Center for Astrophysics, points out that comparable light-sails already exist on earth."Light-sails with similar dimensions have been designed and constructed by our own civilization, including the IKAROS project and the Starshot Initiative. The light-sail technology might be abundantly used for transportation of cargos between planets or between stars."In the paper, the pair theorize that the object's high speed and its unusual trajectory could be the result of it no longer being operational."This would account for the various anomalies of 'Oumuamua, such as the unusual geometry inferred from its light-curve, its low thermal emission, suggesting high reflectivity, and its deviation from a Keplerian orbit without any sign of a cometary tail or spin-up torques."'Oumuamua is the first object ever seen in our solar system that is known to have originated elsewhere.At first, astronomers thought the rapidly moving faint light was a regular comet or an asteroid that had originated in our solar system.Comets, in particular, are known to speed-up due to a process known as "outgassing," in which the sun heats up the surface of the icy comet, releasing melted gas. But 'Oumuamua didn't have a "coma," the atmosphere and dust that surrounds comets as they melt.Multiple telescopes focused on the object for three nights to determine what it was before it moved out of sight. 3063

A San Francisco salon owner says she is “done” with the city and plans to close her shop permanently following backlash and controversy this last week after a video of Speaker of the House Nancy Pelosi inside the salon without a mask surfaced.Owner Erica Kious announced her decision Wednesday night on Tucker Carlson’s Fox News show.Kious owns ESalonSF in San Francisco. She says one of her stylists, who is an independent contractor, told her Speaker Pelosi was coming in for an appointment on August 31. Salons in San Francisco have been closed since March, and were told they could reopen for outdoor services on September 1.Kious released the video of Pelosi’s visit, showing the Speaker with wet hair and not wearing a mask at the time, the day after her appointment.Pelosi responded to the video saying her team had been told it was OK to come inside to have her hair done, and that she felt the incident was “a set-up.” A statement released by the stylist who did her hair reportedly agrees it was a set-up, and states he had gotten permission from Kious verbally the night before the appointment.ABC7 in the Bay Area reports some stylists at ESalonSF have quit, claiming Kious’ made them work during the pandemic in unsafe conditions.The video of Pelosi sparked reaction from a lot of people; including fellow stylists and salon owners, business owners in California, and President Donald Trump, among others. Demonstrators in curlers left hair dryers outside Pelosi’s home last week according to local media. Video of Pelosi's visit was played during a White House briefing on September 3. Kious now says she is “afraid to go back” to San Francisco.“I started to just get a ton of phone calls, text messages, emails, all my Yelp reviews… saying that they hope I go under and that I fail,” Kious told Carlson on Wednesday night. “So just a lot of negativity towards my business.”The news comes just two days after Kious thanked supporters after a GoFundMe account set up to support her and her salon raised more than 0,000.The account stated, "At the conclusion of this fundraiser, ALL donations will go directly to Erica to pay off any debts from the business that she is forced to shut down, expenses to relocate and reopen in a new location."It is not clear if Kious’ comments Wednesday night about closing permanently mean she will not re-open a salon in a different location. The salon’s website does not have information about any closure. 2465

A volcanic eruption has spewed molten rock and hazardous gas from the ground in a small community on Hawaii's Big Island, sending people fleeing from their homes as trees burn and the threat of more destruction is feared.Cracks in Kilauea volcano's rift zone -- an area of fissures miles away from the summit -- erupted Thursday and early Friday, spurting lava in Leilani Estates, a community of about 1,700 people near the Big Island's eastern edge.Video posted on social media Thursday showed magma spewing several feet into the air from a new crack in a Leilani Estates street. Aerial videos showed lava searing a long orange and smoky line through a wooded area. 674