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SAN DIEGO (KGTV) — Nearly three-quarters of the students in San Diego County are currently learning from home, and those numbers don’t make a lot of sense to MIT professor Martin Bazant.Bazant is one of the creators of the COVID-19 Indoor Safety Guideline. The free online tool simulates the fluid dynamics of respiratory droplets in various kinds of rooms to show users the risk of different indoor environments.“If you run the numbers for a typical classroom, especially if the students and the teachers are wearing masks, then the amount of time in the room can be very significant,” Bazant said. “Essentially those people could spend a week in the classroom and not have a problem.”Bazant says the six-foot rule that has largely determined which businesses can stay open is overly simplistic. In some cases, he says the rule creates a false sense of security. In other situations, he says it causes the closure of businesses or schools that could safely operate.“If you place nursing home beds six feet apart in a shared room, they are absolutely not safe,” he said. But he said well-ventilated classrooms, with teachers and students in masks, are another story.“It's only the United States where we follow the six-foot rule. That's given by the CDC. The World Health Organization all along has been saying one meter, which is about three feet. If you simply followed the one-meter rule, all our schools would be open, as they are in most of the world right now,” he said.Bazant and his colleague John Bush said they set out to design a tool that would reveal the risk of transmission based on science, not guesswork.Users start by selecting a room type, like a classroom or an airplane. From there, they can control a wide array of variables to dial in the risk, like the room size, the ceiling height, and the ventilation and filtration systems.From there, users can further tune the model by human behavior. How many people are in the room? Are they whispering, shouting or singing? How many are wearing masks?Mask usage is a critical component, Bazant says. The model quickly reveals the challenges of maskless activities in rooms with poor ventilation. Put five people without masks in a 400 square foot room with closed windows, and it becomes unsafe after 33 minutes.Bazant says studies on super spreader events show in indoor environments, the distance from an infected person doesn’t matter. Infected droplets spread and mix throughout the room like second-hand smoke from a cigarette.But with masks trapping droplets and diverting them upwards like a chimney, an environment like an airplane could be safe for several hours, according to the model. With more than 95% of the passengers and crew wearing surgical masks, a Boeing 737 could support 200 people -- around full capacity depending on the configuration -- for 18 hours. 2850

SAN DIEGO (KGTV) — Police are searching for a hit-and-run suspect who drove into a woman using a motorized chair in Central San Diego.On Dec. 9, just before 4 a.m., San Diego Police say 62-year-old Gloria Williams was riding her motorized mobility device in the left lane of the 100 block of Euclid Avenue, heading northbound. It's not clear why Williams was traveling in the roadway in the Lincoln Park area.The driver of a dark-colored SUV collided into the back of Williams and continued to drive northbound, according to police. Williams died at the scene.Police said they were able to retrieve some details of the suspect's vehicle using optical sensors from nearby Smart Street Lights. The street lights also captured the suspect stopping at a nearby gas station.Gas station surveillance footage showed the suspect, a black man wearing a Pittsburgh Steelers hooded sweatshirt and checkered pants, enter the gas station using a cane.Police are now asking the public for help to identify the suspect. Anyone with information is asked to call San Diego Police at 858-495-7813 or Crime Stoppers at 888-580-8411. 1121

SAN DIEGO (KGTV) - President Trump issued an order Monday prohibiting Broadcom’s attempt to take over San Diego-based Qualcomm, citing national security.Broadcom had made several efforts to buy the chip maker in recent months. All offers were rejected by Qualcomm, which said the bids undervalued the company.The most recent offer, made in February, was over 1 billion. RELATED: Qualcomm delays shareholder vote on Broadcom takeoverThe possible takeover raised security concerns and led to an investigation by the Committee on Foreign Investment in the U.S. In Monday's release, President Trump reportedly cited national security concerns."There is credible evidence that leads me to believe that Broadcom Ltd. ... might take action that threatens to impair the national security of the United States," the president said in a release, Bloomberg reported.The concerns echo issues voiced in a letter to Trump by Congressman Duncan Hunter, who serves California's 50th District including much of San Diego's East County.RELATED: Paul Jacobs leaves Qualcomm's executive management"I have seen San Diego defense companies suffer massive theft of intellectual property by agents of China’s government and the defense industrial complex with which it is inextricably entwined," Hunter said in a release. "Fact remains, if Broadcom consumes Qualcomm, theft of their intellectual property by China becomes easier.Singapore-based Broadcom has voiced the intention to move its headquarters to the U.S. to ease concerns over the proposed takeover. Hunter responded to that intention saying, "press releases of intentions is not the same as physical action."The takeover attempts coincided with changes in corporate leadership.RELATED: Qualcomm rejects Broadcom's 'best and final' offerOn Friday, Qualcomm announced executive Paul Jacobs -- the son of Qualcomm founder Irwin Jacobs - "will no longer serve in an executive management capacity" but "will continue to serve on the Qualcomm Board."Under the terms of the Presidential Order, all of Broadcom’s director nominees are also disqualified from standing for election as directors of Qualcomm, according to the company.Qualcomm was also ordered to reconvene its 2018 Annual Meeting of Stockholders on the earliest possible date, which is March 23.If Broadcom had been allowed to buy Qualcomm, it would have made the firm the world’s third-largest chip company behind Intel and Samsung.Any buyout would also have had a significant impact on San Diego's economy. Qualcomm was founded in 1985 and is one of the region's largest employers. It employs more than 33,000 people worldwide. 2684

SAN DIEGO (KGTV) — Police have arrested a man they say peeped into the homes of at least six women in Pacific Beach over the last two months.James Wayne Hubbard, 48, was arrested Friday and charged with six instances of peeping and one count of petty theft, according to San Diego Police.Police say between Sept. 11 and Oct. 12, Hubbard repeatedly peeped into windows of unsuspecting women in the Pacific Beach area at least six times.MAP: Track crimes happening in your areaPolice added the suspect description was consistent between the six events.Through witness interviews, evidence, and the help of patrol officers Hubbard was identified and arrested.Anyone with further information about the cases is asked to call SDPD Northern Division at 858-552-1700 or Crime Stoppers at 888-580-8477. 817

SAN DIEGO (KGTV) — Police are investigating a shooting in the Chollas Creek area Friday that left a man with multiple gunshot wounds.San Diego Police say a 22-year-old Hispanic male was walking in the 5300 block of Lea St. when he was approached by a Hispanic male suspect sometime before 7 p.m. Friday. A brief conversation began between the two, before the suspect pulled out a handgun and fire four times at the man, police say.The man was hit three times by gunfire. He was taken to a nearby hospital where he was treated for non-life threatening injuries.The suspect fled the scene in a red sedan, heading eastbound on Lea St. He is described as being 5-foot 8-inches tall with thin build. He was last seen wearing a dark colored hooded jacket and dark hat.SDPD Gang detectives are investigating. Anyone with information is asked to call police at 619-531-2000 or 858-484-3154. 890

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