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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 investigating the death of a man who was found with stab wounds in a gas station parking lot in Webster.San Diego police said they received a 911 call just before 10:30 p.m. Thursday regarding a possible stabbing victim in the 4300 block of Home Avenue.Officers arrived to find a 31-year-old Black man with “apparent trauma to his upper torso,” according to SDPD officials.The victim was eventually taken to the hospital for emergency surgery, but he later died from his injuries. His name was not released.SDPD Homicide Unit investigators learned the stabbing occurred in an area of the 4600 block of Home Avenue, and the victim was able to drive himself to the parking lot of an Arco ampm gas station, where he was found.Police said the only information available regarding the suspected attacker is a Black male wearing a dark-colored sweatshirt.Anyone with information on this case is asked to call the SDPD Homicide Unit at 619-531-2293 or Crime Stoppers at 888-580-8477. 1015

SAN DIEGO (KGTV) - Police are searching for a mystery shooter that appears to using moving vehicles for target practice on a road in La Jolla.On Thursday just past 10 p.m. on La Jolla Parkway, Judy Chance was in her minivan running errands. It happened about a quarter mile from the fire station."Bang, bang, bang, bang. Basically all at once," said Chance.Her minivan was under attack."Enough to caused me to jerk back. When I looked, I saw circles in my windshield, like target practice," said Chance.On the windshield were at least six circles. Whatever caused them cracked but didn't puncture the glass."I was shocked. I was scared but had to regain composure as I was driving," said Chance.Chance pulled over and called police, feeling frightened, but grateful."Luckily I was going slow. I could have gone off the road. Glad my side window was closed," said Chance.Chance was not the only victim. Just minutes prior, in the same location, a couple driving a Mercedes says they heard a loud blast and saw a flash, before their windshield was pelted with shots. Some eight circles were found on their windshield. Was it a BB or pellet gun? One gun expert told 10news the flash and grouping may point to a shotgun, possibly loaded with birdshot. Chance says there were no vehicles around them, so the shooter may have been standing on the side of the road.Detectives say they don't have any suspect description. Any witnesses or any additional victims are asked to call San Diego Police at 619-531-2000. 1513

SAN DIEGO (KGTV) - Nearly 1,000 students and volunteers will work together to clean Mission Beach Thursday as part of this year's Kids' Ocean Day. After removing the litter, students will create an aerial art image that will read "WAVES OF CHANGE" to advocate for a safer, cleaner ocean.Humans deposit eight million metric tons of plastic into the world's oceans every year. Plastics break down into smaller and smaller pieces called microplastics, which are dangerous to both marine life and people. San Diego’s event was coordinated locally by I Love A Clean San Diego (ILACSD). It is one of five happening across the state.DetailsWhen: Thursday, May 24, 2018 from 8:00 a.m- 12:00 p.m 714

SAN DIEGO (KGTV) — More people have tested positive at the San Diego Convention Center, which has been serving as a shelter for San Diego's homeless since April.Regular testing has been conducted at the Convention Center since the shelter opened, but there was a rise in positive cases starting with tests administered on Dec. 3. Since then, there have been 120 positive cases detected. According to city officials, 115 are clients and five are staff members.Prior to Dec. 3, the city says there had been 27 positive cases since April.Dr. Eric McDonald, medical director of the County Health and Human Services Agency's Epidemiology and Immunization Branch, released the following statement: 699