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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) - One person was hospitalized with smoke inhalation after a fire erupted at a Normal Heights home Friday morning. 138

SAN DIEGO (KGTV) — One person was shot Sunday outside of a College Area smoke shop, according to police.It wasn't immediately clear what led to the shooting, but San Diego Police confirmed that a 20-year-old man had been shot just before 5:30 p.m. in the 5900 block of El Cajon Blvd., outside of Aztec Smoke & Vape Shop.The victim was hit in the leg and chest and taken to a nearby hospital, but their condition was not clear.The area was closed by police for the investigation.10News is monitoring this breaking news. Please check back for updates. 561

SAN DIEGO (KGTV) - Opening statements are scheduled to begin Wednesday in the civil trial for one of San Diego's most mysterious and infamous cases. 156

SAN DIEGO (KGTV) — Now that the Democratic Party has officially backed Joe Biden and Kamala Harris, it’s time for the Republican National Convention. The four-night convention begins with a roll call on Monday evening from delegates who take turns stating their pick for the nominee. California Republican National Committeewoman and Delegate to Republican National Convention Harmeet Dhillon said they are expecting a unanimous vote for President Trump and VP Mike Pence.Then, top republicans and citizens will speak through the next few nights. President Trump is expected to speak Thursday evening, but the schedule also shows he will be in the program to some capacity every evening.This would typically be a time when hundreds from California attend, but with coronavirus restrictions, that’s not possible this year. Dhillon said California would typically have 170 delegates, an equal number of alternates and guests, but that number has dwindled to just 6 for 2020. She said everyone in Charlotte has taken multiple coronavirus tests and said she feels safe with the health guidelines being practiced.Dhillon also said that she encouraged people who would not be flying to the RNC to donate the money saved from staying home. She said it typically costs thousands of dollars per person to travel to the convention.“I asked a lot of people to please contribute that money toward the candidate of your choice in California so I think the cancellation of this event has actually led to a lot of, hundreds of thousands of dollars being invested back into California,” she said.A schedule of the week can be found here. 1630