aarondubrow shares a report from the Texas Advanced Computing Center: A new study in the Bulletin of the Seismological Society of America presents results from a new earthquake simulator, RSQSim, that simulates hundreds of thousands of years of seismic history in California. Coupled with another code, CyberShake, the framework can calculate the amount of shaking that would occur for each quake. [The framework makes use of two of the most powerful supercomputers on the planet: Frontera, at the Texas Advanced Computing Center, and Summit, at Oak Ridge National Laboratory].

The new approach improves [seismologists'] ability to pinpoint how big an earthquake might occur at a given location, allowing building code developers, architects, and structural engineers to design more resilient buildings that can survive earthquakes at a specific site.

Moderna's Covid vaccine appears to work against new, more infectious variants of the pandemic virus found in the UK and South Africa, say scientists from the US pharmaceutical company. The BBC reports: Early laboratory tests suggest antibodies triggered by the vaccine can recognize and fight the new variants. More studies are needed to confirm this is true for people who have been vaccinated. Current vaccines were designed around earlier variants, but scientists believe they should still work against the new ones, although perhaps not quite as well. There are already some early results that suggest the Pfizer vaccine protects against the new UK variant.

For the Moderna study, researchers looked at blood samples taken from eight people who had received the recommended two doses of the Moderna vaccine. The findings are yet to be peer reviewed, but suggest immunity from the vaccine recognizes the new variants. Neutralizing antibodies, made by the body's immune system, stop the virus from entering cells. Blood samples exposed to the new variants appeared to have sufficient antibodies to achieve this neutralizing effect, although it was not as strong for the South Africa variant as for the UK one. Moderna says this could mean that protection against the South Africa variant might disappear more quickly. Moderna says it's investigating whether a redesigned vaccine would be more effective against the new variants. It's also testing whether giving a third booster shot might be beneficial.

Earth's ice is melting faster today than in the mid-1990s, new research suggests, as climate change nudges global temperatures ever higher. From a report: Altogether, an estimated 28 trillion metric tons of ice have melted away from the world's sea ice, ice sheets and glaciers since the mid-1990s. Annually, the melt rate is now about 57 percent faster than it was three decades ago, scientists report in a study published Monday in the journal The Cryosphere. "It was a surprise to see such a large increase in just 30 years," said co-author Thomas Slater, a glaciologist at Leeds University in Britain. While the situation is clear to those depending on mountain glaciers for drinking water, or relying on winter sea ice to protect coastal homes from storms, the world's ice melt has begun to grab attention far from frozen regions, Slater noted.

Google CEO Sundar Pichai on Monday said the company will make its office facilities available for COVID-19 vaccination clinics, as tech giants aim to speed up distribution efforts in the US. From a report: The company said it's partnering with the health care provider One Medical for the clinics, which will be opened "as needed" at Google buildings, parking lots and open spaces. For now, Google is targeting its campuses in the San Francisco Bay Area, where the company is headquartered; Los Angeles; New York City; and Kirkland, Washington, outside of Seattle. [...] The company also said it will use artificial intelligence from its Google Cloud division to help health care providers and pharmacies with the logistics of vaccine distribution. That includes detecting changes in the temperature of vaccine doses, which must be stored in cool conditions. Google also said it's committing more than $150 million in free ads and other investments to public health agencies and nonprofits promoting vaccine education.

Ars Technica reported Saturday that "The Falcon 9 rocket was ready. Its payload of 143 satellites were ready. But Mother Nature was not ready."

Although SpaceX pressed ahead with fueling of the Falcon 9 booster on Saturday morning, the company scrubbed the launch attempt of the Transporter-1 mission a few minutes before the window opened due to weather. Conditions at Cape Canaveral violated the electrical field rule for a safe launch. The company now plans to try to launch again on Sunday morning, with the launch window opening at 10am ET (15:00 UTC).
Slashdot noted earlier that SpaceX plans to launch the most satellites ever deployed in a single mission, 143, from Florida for more than a dozen customers. UPI reports: A 2017 mission by the India Space Research Organization launched 104 spacecraft, which would be the previous record if the SpaceX launch is a success... The Transporter-1 mission is the first in a series of regularly scheduled SpaceX rideshare projects for multiple customers. SpaceX also plans to carry 10 of its Starlink communications satellites on this mission.

"The Starlink satellites aboard this mission will be the first in the constellation to deploy to a polar orbit," according to the SpaceX mission description. Polar orbits circle the globe by passing over the North Pole and South Pole, while many satellites circle above equatorial regions. Houston-based space firm Nanoracks is acting as a broker to arrange some customers for the launch, said Tristan Prejean, a mission manager at Nanoracks. Nanoracks' two customers for Transporter-1 are two satellite companies, California-based Spire Global and Montreal-based GHGSat. Spire launches fleets of small satellites that monitor weather and patterns for shipping for aviation interests. GHGSat monitors industrial emissions of gasses from space -- especially greenhouse gases that contribute to climate change.

David Leonhardt won a Pulitzer Prize for commentary in 2011. This week in a New York Times newsletter, he argues that early in the pandemic experts around the world mistakenly discouraged mask use because of "a concern that people would rush to buy high-grade medical masks, leaving too few for doctors and nurses. The experts were also [at the time] unsure how much ordinary masks would help."

But are they now spreading a similarly misguided pessimism about vaccines? Right now, public discussion of the vaccines is full of warnings about their limitations: They're not 100 percent effective. Even vaccinated people may be able to spread the virus. And people shouldn't change their behavior once they get their shots...

"It's going to save your life — that's where the emphasis has to be right now," Dr. Peter Hotez of the Baylor College of Medicine said. The Moderna and Pfizer vaccines are "essentially 100 percent effective against serious disease," Dr. Paul Offit, the director of the Vaccine Education Center at Children's Hospital of Philadelphia, said. "It's ridiculously encouraging."

Here's my best attempt at summarizing what we know:

- The Moderna and Pfizer vaccines — the only two approved in the U.S. — are among the best vaccines ever created, with effectiveness rates of about 95 percent after two doses. That's on par with the vaccines for chickenpox and measles. And a vaccine doesn't even need to be so effective to reduce cases sharply and crush a pandemic.

- If anything, the 95 percent number understates the effectiveness, because it counts anyone who came down with a mild case of Covid-19 as a failure. But turning Covid into a typical flu — as the vaccines evidently did for most of the remaining 5 percent — is actually a success. Of the 32,000 people who received the Moderna or Pfizer vaccine in a research trial, do you want to guess how many contracted a severe Covid case? One.

Although no rigorous study has yet analyzed whether vaccinated people can spread the virus, it would be surprising if they did.
The article suggests less-positive messages are being conveyed in part because "As academic researchers, they are instinctively cautious, prone to emphasizing any uncertainty."

But the article ultimately concludes that in fact, "the evidence so far suggests that the vaccines are akin to a cure."

Darrell Etherington reports via TechCrunch: Web infrastructure company Cloudflare is releasing a new tool today that aims to provide a way for health agencies and organizations globally tasked with rolling out COVID-19 vaccines to maintain a fair, equitable and transparent digital queue -- completely free of charge. The company's Project Fair Shot initiative will make its new Cloudflare Waiting Room offering free to any organization that qualifies, essentially providing a way for future vaccine recipients to register and gain access to a clear and constantly-updated view of where they are in line to receive the preventative treatment.

On the technical side, Cloudflare Waiting Room is simple to implement, according to the company, and can be added to any registration website built on the company's existing content delivery network without any engineering or coding knowledge required. Visitors to the site can register and will receive a confirmation that they're in line, and then will receive a follow-up directing them to a sign-up page for the organization administering their vaccine when it's their turn. Further configuration options allow Waiting Room operators to offer wait time estimates to registrants, as well as provide additional alerts when their turn is nearing (though that functionality is coming in a future update).

Waiting Room was already on Cloudflare's project roadmap, and was actually intended for other high-demand, limited supply allocation items: Think must-have concert tickets, or the latest hot sneaker release. But the Fair Shot program will provide it totally free to those organizations that need it, whereas that would've been a commercial product. Interested parties can sign up at Cloudflare's registration page to get on the waitlist for availability.

The real impact of Covid-19 on North Korea -- and its citizens -- remains a mystery. Faced with a global health crisis, the country has turned inwards more than ever. From a report: "North Korea, in general, is more difficult to know this year or last year than at almost any point in the last two decades," says Sokeel Park, the director of research at Liberty in North Korea, a group that works with defectors from the country to understand what happens inside its borders. "It seems clear to me that, nonetheless, the North Korean government has massively overreacted." Officially, North Korea has recorded no cases of Covid-19. Weekly reports from the World Health Organisation's South-East Asia office show that North Korean samples from PCR tests are being processed in 15 laboratories but all of these have come back negative. As of January 8, the most recent date for which figures are available, 26,244 samples from 13,259 people have come back negative. Around 700 North Koreans, out of a population of 25 million, are being tested each week.

"I don't know many people in the North Korea watcher, analyst and journalist community that actually believe there are no cases," Park says. All of the North Korea experts spoken to for this article agree. Some have accused North Korea of lying, while others suggest its approach is all about keeping control and public perception. The closest officials got to admitting there may be a case was in July when state newspaper Rodong Sinmun reported a "state of emergency" had been declared in Kaesong City, in the south of the country. The newspaper reported a defector who had returned to the country from South Korea was "suspected" to have Covid-19. But the case was never confirmed. Kim Yo-jong, the sister of Kim Jong-un, has hit back at suggestions from South Korea that the country may have had cases, describing such talk as "reckless."

From the outside, it is impossible to prove the scale of the Covid-19 crisis in North Korea. All official messaging is controlled by Kim Jong-un's regime and international diplomats and humanitarian groups have largely left the country. The last remaining members of the International Committee of the Red Cross left the country on December 2. The result is that little reliable information finds its way out of North Korea -- those with contacts inside the country and who work with defectors say it has been impossible to work out the reality of the health situation on the ground. Despite reporting no cases of Covid-19, North Korea has been quarantining potential suspected cases. As of December 3, 33,223 people had been released from quarantine, according to the figures reported to the WHO -- though no numbers have been reported since. Quarantine rules in North Korea are also strict, according to reports. When an outbreak occurred in China, North Korea tracked down all Chinese visitors in the town of Rason âand quarantinedâ them âon an island for a month.

Avi Loeb, former chair of the astronomy department at Harvard University and who chairs the Board on Physics and Astronomy of the National Academies, writing at Scientific American: It is presumptuous to assume that we are worthy of special attention from advanced species in the Milky Way. We may be a phenomenon as uninteresting to them as ants are to us; after all, when we're walking down the sidewalk we rarely if ever examine every ant along our path. Our sun formed at the tail end of the star formation history [PDF] of the universe. Most stars are billions of years older than ours. So much older, in fact that many sunlike stars have already consumed their nuclear fuel and cooled off to a compact Earth-size remnant known as a white dwarf. We also learned recently that of order half [PDF] of all sunlike stars host an Earth-size planet in their habitable zone, allowing for liquid water and for the chemistry of life.

Since the dice of life were rolled in billions of other locations within the Milky Way under similar conditions to those on Earth, life as we know it is likely common. If that is indeed the case, some intelligent species may well be billions of years ahead of us in their technological development. When weighing the risks involved in interactions with less-developed cultures such as ours, these advanced civilizations may choose to refrain from contact. The silence implied by Fermi's paradox ("Where is everybody?") may mean that we are not the most attention-worthy cookies in the jar.

An anonymous reader Phys.Org: The Korea Institute of Science and Technology (KIST) announced that the collaborative research team led by Dr. Kwan Hyi Lee from the Biomaterials Research Center and Professor In Gab Jeong from Asan Medical Center developed a technique for diagnosing prostate cancer from urine within only 20 minutes with almost 100% accuracy. The research team developed this technique by introducing a smart AI analysis method to an electrical-signal-based ultrasensitive biosensor. As a noninvasive method, a diagnostic test using urine is convenient for patients and does not need invasive biopsy, thereby diagnosing cancer without side effects. However, as the concentration of cancer factors is low in urine, urine-based biosensors are only used for classifying risk groups rather than for precise diagnosis thus far.

Dr. Lee's team at the KIST has been working toward developing a technique for diagnosing disease from urine with an electrical-signal-based ultrasensitive biosensor. An approach using a single cancer factor associated with a cancer diagnosis was limited in increasing the diagnostic accuracy to over 90%. However, to overcome this limitation, the team simultaneously used different kinds of cancer factors instead of using only one to enhance the diagnostic accuracy innovatively.

The team developed an ultrasensitive semiconductor sensor system capable of simultaneously measuring trace amounts of four selected cancer factors in urine for diagnosing prostate cancer. They trained AI by using the correlation between the four cancer factors, which were obtained from the developed sensor. The trained AI algorithm was then used to identify those with prostate cancer by analyzing complex patterns of the detected signals. The diagnosis of prostate cancer by utilizing the AI analysis successfully detected 76 urinary samples with almost 100 percent accuracy. The results of the study have been published in the journal ACS Nano.

Amazon has extended an offer to President Joe Biden to assist with the national distribution of Covid-19 vaccines, a move that could expedite the federal effort to combat the pandemic. From a report: Dave Clark, the CEO of Amazon's consumer business, and one of the company's highest-ranking executives, sent a letter to the president shortly after he was sworn in Wednesday. "As you begin your work leading the country out of the COVID-19 crisis, Amazon stands ready to assist you in reaching your goal of vaccinating 100 million Americans in the first 100 days of your administration," he wrote in his letter, a copy of which was obtained by NBC News.

"We are prepared to leverage our operations, IT, & communications capabilities and expertise to assist your administration's vaccination efforts," Clark wrote. "Our scale allows us to make a meaningful impact immediately in the fight against COVID-19, and we stand ready to assist you in this effort." Clark said Amazon had agreements in place with licensed third-party health care providers to administer vaccines on-site at Amazon facilities. "We are prepared to move quickly once vaccines are available," he wrote.

New Atlas reports on ag-tech company Vertical Field's efforts to produce soil-based indoor vertical farms grown at the very location where food is consumed. From the report: The Vertical Field setup retains many of the advantages of hydroponic vertical farms, but instead of the plants growing in a nutrient-packed liquid medium, the container-based pods treat their crops to real soil, supplemented by a proprietary mix of minerals and nutrients. The company says that it opted for geoponic production "because we found that it has far richer flavor, color, and quality."

The recycled and repurposed 20- or 40-ft (6/12-ft) shipping containers used to host the farms can be installed within reach of consumers, such as in the parking lot of a restaurant or out back at the grocery store. Growers can also scale up operations to more than one pod per site if needed, and the external surfaces could be covered in a living wall of decorative plants to make them more appealing. The vertical urban farms are claimed capable of supporting the production of a wide range of fruits and veggies -- from leafy greens and herbs to strawberries and mushrooms, and more. And it's reported to use up to 90 percent less water than a traditional farming setup.

Unlike some high-tech farming solutions, staff won't need special training to work with the vertical farm as the automated growing process monitors, irrigates, and fertilizes the crops as they grow thanks to arrays of sensors that continually feed data on climate, soil condition, LED lighting and so on to management software. Each vertical farm unit has its own Wi-Fi comms technology installed to enable operators to tap into the system via a mobile app. The company told us that, by way of example, one container pilot farm offered a growing space of 400 sq ft (37 sq m) and yielded around 200 lb (90 kg) of produce per month, harvested daily. Lighting remained on for 16 hours per day. We assume that the pods are completely powered from the grid at their respective locations, though the company says that it is looking at ways to make use of solar panels as well as making more efficient use of water.

Scientists from a trio of universities have combined satellite imagery with deep learning to detect elephants from space. The goal is to help protect these endangered species from poachers or habitat destruction. Their study was published in the journal Ecology and Conservation. Interesting Engineering reports: The team's method proved comparable to human detection accuracy and could help solve a number of existing challenges, such as cross-border limits, and cloud coverage, among others. The team used Maxar WorldView-3 satellite imagery, which is capable of collecting more than one million acres (5,000 km2) imagery in one go in just a few minutes. This allows for fast repeat imaging when necessary, and minimizes the risk of double counting as it's so rapid.

Then the team leveraged deep learning to process the vast amount of imagery it collected from Maxar's WorldView-3 satellite. In a matter of hours, the team collected its relevant data. This process usually takes months when sorting out by hand. On top of speed, the deep learning algorithms also provided consistent results less prone to error, as well as false negatives and false positives. In order to develop this method, the team created a customized training dataset of over 1,000 elephants, and then fed it into a Convolutional Neural Network (CNN). After trials, the team concluded that its CNN can detect elephants in satellite imagery with as high an accuracy as human detection capabilities.

Boeing's test of the largest rocket in U.S. history ended earlier than expected on Jan. 16 because a hydraulic-system setting exceeded a preset limit, dealing another setback to the company's space ambitions. From a report: The first firing of all four RS-25 engines on the Space Launch System rocket ended just 67.2 seconds into the planned eight-minute test. The so-called hot fire exercise at the NASA's Stennis Space Center in Mississippi was designed to simulate a full flight from Earth. Engineers from NASA, Boeing and the engines' maker, Aerojet-Rocketdyne Holdings, will assess data and determine whether a second test is needed or if the rocket is ready to ship to Florida's Kennedy Space Center to prepare for its maiden flight. The SLS can be loaded with its super-chilled propellants -- liquid oxygen and liquid hydrogen -- only nine times, which will be a consideration in whether to stage a second test at Stennis, NASA said Tuesday.

The shutdown "was triggered by test parameters that were intentionally conservative to ensure the safety of the core stage during the test," NASA said in a blog post Tuesday. Preliminary inspections and data reviews "show the rocket's hardware is in excellent condition," the agency said. The test was cut short just as the engines began to pivot and test their thrust capability while rotating on gimbals. The premature end, before engineers collected a full array of data, represented another hurdle for Boeing's space program. The SLS rocket has been plagued by years of delays and billions of dollars in cost overruns. The program has broad support in Congress because of the federal contracts and jobs it offers across many states. Boeing also is attempting to correct glitches with its Starliner spacecraft, which would ferry astronauts to and from the International Space Station under a NASA contract. Boeing said Monday it had completed qualification of Starliner's flight software following an extensive review. A second test of the vehicle to the ISS is slated for March, following a botched flight in December 2019. A crewed flight is expected later this year.

China is rushing to build a massive quarantine camp that can house more than 4,000 people, after an outbreak of Covid-19 this month that has left tens of millions of people under strict lockdown. From a report: The quarantine camp is located on the outskirts of Shijiazhuang, the provincial capital of Hebei province, which surrounds the country's capital, Beijing. China has largely contained the spread of the virus, with much of the country returning to normal. However, a sudden rise in cases has alarmed officials and raised concerns ahead of the Lunar New Year, the county's most important annual festival, during which hundreds of millions of people are expected to travel to visit family members. Officials in Shijiazhuang, where the outbreak is centered, have initiated mass testing and strict lockdowns, moving entire villages into centralized quarantine facilities in a bid to curb the spread of the virus.

The new quarantine camp will house close contacts of confirmed Covid-19 patients, as authorities continue an extensive contact tracing and testing program. It was originally planned to house 3,000 people, but has since been expanded to a capacity of 4,160. More than 4,000 construction workers performed "six days' and nights' work" to complete the first phase, said Shijiazhuang Deputy Mayor Meng Xianghong on Tuesday. Authorities began construction on January 13 and the first section of the camp is now complete and ready for use, while construction continues on the second phase, according to state-owned broadcaster CCTV. Each prefabricated room is expected to measure 18 square meters (around 194 square feet), and will come with an en-suite bathroom and shower, desks, chairs, beds, Wi-Fi, and a television set, according to CCTV.

Terraformation, a startup led by Yishan Wong, former CEO of Reddit, is demonstrating an approach to reforest the planet quickly enough to fight climate change. Fast Company reports: Trees can play a key role in capturing carbon at scale -- by one estimate, nearly a trillion hectares of land could feasibly be reforested, and those trees could potentially store more than 200 gigatons of carbon. But efforts at reforestation are moving too slowly. "Essentially, we need to scale the solution in about 10 years, so that there is time for the forest to mature and become a carbon sink of reasonable size to meet various nations' commitments to be net zero around 2040 or 2050," says Yishan Wong, CEO of the Hawaii-based startup, called Terraformation.

One of the challenges the company identified was the lack of land: Some land that was originally forested is now covered by cities or used for farming. Other areas might not be available for sale. But there's a large amount of desertified land that is available. The United Nations Convention to Combat Desertification reports that around 4.7 billion acres on the planet -- about twice the size of China -- have been affected by drought or desertification, but could potentially be restored. Finding enough water to grow trees there is a challenge. But the folks at Terraformation believe that if desalinated water is used to irrigate seedlings, a restored forest will eventually be able to sustain itself.

In Hawaii, the startup built the world's largest fully off-grid, solar-powered desalination system. With a half-acre of solar panels, there's enough power to desalinate around 34,000 gallons of water per day, taken from a well on the site. A drip irrigation system sends the water to the roughly 1,900 native trees and shrubs that have been planted in the area so far. As the forest grows, proving that the system works, the company is working to replicate the same idea around the world. It's creating seed banks that fit inside shipping containers and can store the millions of native seeds that are necessary for large planting projects. It's also building open-source software that groups can use to collect data and track progress after trees are planted.

According to new research from Leicester University and the Office for National Statistics (NS), almost a third of recovered COVID-19 patients will end up back in the hospital within five months and one in eight will die. Yahoo News reports via The Telegraph: Out of 47,780 people who were discharged from hospital in the first wave, 29.4 per cent were readmitted to hospital within 140 days, and 12.3 per cent of the total died. The current cut-off point for recording Covid deaths is 28 days after a positive test, so it may mean thousands more people should be included in the coronavirus death statistics. Researchers have called for urgent monitoring of people who have been discharged from hospital.

Study author Kamlesh Khunti, professor of primary care diabetes and vascular medicine at Leicester University, said: "This is the largest study of people discharged from hospital after being admitted with Covid. People seem to be going home, getting long-term effects, coming back in and dying. We see nearly 30 per cent have been readmitted, and that's a lot of people. The numbers are so large. The message here is we really need to prepare for long Covid. It's a mammoth task to follow up with these patients and the NHS is really pushed at the moment, but some sort of monitoring needs to be arranged."

The study found that Covid survivors were nearly three and a half times more likely to be readmitted to hospital, and die, in the 140 days timeframe than other hospital outpatients. Prof Khunti said the team had been surprised to find that many people were going back in with a new diagnosis, and many had developed heart, kidney and liver problems, as well as diabetes. "We don't know if it's because Covid destroyed the beta cells which make insulin and you get Type 1 diabetes, or whether it causes insulin resistance, and you develop Type 2, but we are seeing these surprising new diagnoses of diabetes,â he added. "We've seen studies where survivors have had MRS scans and they've cardiac problems and liver problems. These people urgently require follow up and the need to be on things like aspirin and statins."

"Researchers claim achievement of new record photovoltaic conversion efficiencies for perovskite-based solar cells by spicing them up with a little capsaicin," writes Slashdot reader ffkom, adding: "Of course everyone who loves to eat chilis already knew capsaicin energizes you to record levels." The researchers have published their findings in the journal Joule. From the report: Perovskite solar cells (PSCs) suffer from significant nonradiative recombination, limiting their power conversion efficiencies. Here, for the first time, we directly observe a complete transformation of perovskite MAPbI 3 surface region energetics from p- to n-type during defect passivation caused by natural additive capsaicin, attributed to the spontaneous formation of a p-n homojunction in perovskite active layer. We demonstrate that the p-n homojunction locates at 100 nm below perovskite surface. The energetics transformation and defect passivation promote charge transport in bulk perovskite layer and at perovskite/PCBM interface, suppressing both defect-assisted recombination and interface carrier recombination. As a result, an efficiency of 21.88% and a fill factor of 83.81% with excellent device stability are achieved, both values are the highest records for polycrystalline MAPbI 3 based p-i-n PSCs reported to date. The proposed new concept of synergetic defect passivation and energetic modification via additive provides a huge potential for further improvement of PSC performance.

Smartwatches and other wearable devices that continuously measure users' heart rates, skin temperature and other physiological markers can help spot coronavirus infections days before an individual is diagnosed. From a report: Devices like the Apple Watch, Garmin and Fitbit watches can predict whether an individual is positive for COVID-19 even before they are symptomatic or the virus is detectable by tests, according to studies from leading medical and academic institutions, including Mount Sinai Health System in New York and Stanford University in California. Experts say wearable technology could play a vital role in stemming the pandemic and other communicable diseases. Researchers at Mount Sinai found that the Apple Watch can detect subtle changes in an individual's heartbeat, which can signal that an individual has the coronavirus, up to seven days before they feel sick or infection is detected through testing. "Our goal was to use tools to identify infections at time of infection or before people knew they were sick," said Rob Hirten, assistant professor of medicine at the Icahn School of Medicine at Mount Sinai in New York City and author of the Warrior Watch study. Specifically, the study analyzed a metric called heart rate variability -- the variation in time between each heartbeat -- which is also a measure of how well a person's immune system is working.

CNN reports: According to Johns Hopkins University's tally of cases in the United States, there have been at least 23,754,315 cases of coronavirus in the U.S., and at least 395,785 deaths. On Saturday, Johns Hopkins reported 198,218 new cases and 3,286 new deaths...

On Friday, the CDC said new more contagious variants of the coronavirus will likely accelerate the spread of the virus and that means the US must double down on efforts to protect people.
The U.S. Census Bureau calculates the country's entire population is 330,827,996 people. These figures suggest 7.18% of the American population has now experienced the disease — more than 1 out of every 14 Americans.