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As teachers report to work this week at Georgia’s largest school district, the Gwinnett County Public Schools, 260 of them tested positive or reported exposure to the coronavirus, according to multiple reports.Officials told CNN that most of the cases were likely through community spread. "As of last Thursday, we had approximately 260 employees who had been excluded from work due to a positive case or contact with a case," GCPS spokeswoman Sloan Roach told CNN. "This number is fluid as we continue to have new reports and others who are returning to work," she added.The district plans to reopen August 12 after shutting down in March. Nearly 160,000 students attend classes in Gwinnett County.The area saw a rise in coronavirus cases in July, according to public health data. The state of Georgia has averaged over 3,000 new coronavirus cases per day in the month of July."Given the number of COVID cases in Gwinnett we would expect to see positives among our employees based on the community spread in our county," Roach told CNN. 1045

At least three people in Louisiana have died as a result of Hurricane Laura after trees fell onto their homes.Gov. John Bel Edwards said he’s received a report of the first US fatality from Hurricane Laura in Louisiana, a 14-year-old girl who died when a tree fell on her home. 285

At 3 p.m. ET on Monday, November 26, a group of researchers will be really sweating. The NASA InSight spacecraft will try to land on Mars.After six months of flight, the lander component of the probe will detach itself from the cruise stage and head into the atmosphere. The lander component initially looks a fair bit like the re-entry capsule used in the 1960s and 1970s for the Apollo moon missions -- sort of conical, with a smooth and flat bottom. That bottom is a crucial heat shield that is designed to protect the probe as it passes through the thin Martian atmosphere.The landing is a devilishly difficult feat. The landing capsule has to batter its way through the atmosphere. It will fly through the Martian air at an initial speed of 12,300 mph, and it must hit the atmosphere at an angle of precisely 12 degrees. Any shallower, and the probe will bounce off into deep space. Any steeper, and the probe will burn itself up in a spectacular and fiery death. The probe will first touch the atmosphere six minutes and 45 seconds before landing. During this phase, it will experience acceleration 12 times that of the Earth's gravity. Were the probe a 150-pound human, during the flaming descent, it would weigh nearly a ton.About 3? minutes after the probe hits the atmosphere, a parachute will deploy, slowing down the probe even more. Fifteen seconds later, explosives will blow the heat shield off, exposing the actual InSight probe hidden inside. Ten seconds after the heat shield falls away, the probe will extend its legs, much like an airplane extends its wheels before touching down.The probe will fall for an additional two minutes attached to the parachute and protected by its conical shell. About 45 seconds before InSight lands, it will drop out of the shell and fall toward the surface. As soon as it leaves the shell, its landing rockets will ignite.The actual InSight probe looks a little bit like the Apollo moon lander, with three legs to support it and a boxy top. The rockets will slow it further and stop any remaining horizontal motion. Then, about 15 seconds before touchdown, the InSight probe will descend at a speed of 8 feet per second, before hopefully touching down gently on the Martian surface.The entire landing sequence will take about seven minutes to occur. A radio signal from Mars to Earth currently takes about eight minutes and seven seconds to get here. So the complete landing process will take place before we find out if it was successful. It will be done automatically, entirely by the probe itself. For the scientists and engineers who designed InSight, this is called "seven minutes of terror."And they are right to be worried. Mars is a graveyard of failed probes. There have been 44 attempts by various national space agencies to land on Mars. Eighteen have been successful. Twenty-three have not. Three have achieved orbit but failed at a landing.So, what does InSight hope to achieve? Well, as it happens, a lot. But it's different than the intrepid Curiosity probe, which NASA landed in 2012. InSight will not move around. Instead, it will stay put and tell us of the interior of Mars.One thing it will do is emit radio waves that we can monitor on Earth. By making careful measurements of how the frequency of the radio waves change, we will be able to measure the degree to which Mars wobbles as it rotates. That will tell us something about the core of the planet, specifically its makeup and information on the degree to which it is molten.InSight will also deploy a seismometer to listen for marsquakes (like earthquakes, but Martian-style) and for impacts of meteors on the planet. Information gleaned from the waves the seismometer detects will tell us more about the planet's interior.The third thing InSight will do is to dig below the planet's surface. Using a jackhammer, the probe will drill down 5 meters (16 feet) into the planet and, basically, it will take the planet's temperature.There are many reasons this is interesting. Taking the temperature at that depth will allow planetary scientists to determine how much heat is escaping from Mars. More broadly, this measurement will allow a clear determination of the temperature of the planet much closer to the core.This information will tell us a lot about how Mars formed, which, in turn, will add to the information of how rocky planets, including our own Earth, typically develop.And if you're more of an explorer kind of person and not so interested in Martian geology, it will also tell us how warm the planet is at modest depths, which will tell us if there is any chance of liquid water on the planet. Perhaps obviously, if the Martian subsurface is warm enough, any buried water will be in liquid form and not ice. Finding liquid water would be the key discovery that would make Martian exploration relatively easy. A relatively recent possible discovery of a buried Martian lake was promising, but the data was not conclusive. Knowing that the ground is warm would be very comforting to possible future explorers.Exploring the solar system is the first step toward exploring the stars. The InSight probe will give us --well -- insight into whether this is something that humanity will achieve in the foreseeable future.And maybe Elon Musk's bet on him getting to Mars will become true. 5329

Attorneys general from several states plan to jointly file new antitrust litigation against Facebook in the coming days, according to reports from CNBC and the Wall Street Journal.According to CNBC, as many as 40 states are expected to join New York in suing the social media giant. The report also says that the Federal Trade Commission could file a separate but related complaint in district court.While the specifics of the pending lawsuit are unclear, Facebook has been criticized for swallowing up competitors, like Instagram and WhatsApp for fairly reasonable prices.The pending lawsuit would mark the second significant piece of legislation filed against a Silicon Valley giant in recent months. In October, the Justice Department sued Alphabet, the parent company of Google, and alleged the company is a search engine monopoly. 843

As Thanksgiving nears, 74 more cases of salmonella, including 1 death, have been linked to raw turkey products, according to the Centers for Disease Control and Prevention.The CDC announced the outbreak in July, but more people have gotten sick, bringing the total to 164 in 35 states. One person in California has died, and 63 people have been hospitalized.The outbreak started in November 2017. It's unclear where the turkey at the center of this outbreak came from, as there doesn't appear to be one centralized distributor, the agency said. This could mean that "it might be widespread in the turkey industry."Lab tests show that the salmonella came from a variety of products, including ground turkey and turkey patties. Tests showed that it's also been in live turkeys and pet food. 796

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