Space

Apollo 15 Astronaut Al Worden Passes Away (nasa.gov) 21

"Former astronaut Alfred M. Worden, command module pilot on the Apollo 15 lunar landing, passed away March 18, 2020, in Texas," reports NASA.gov. His son-in-law told the New York Times Worden apparently died of a stroke.

"Al was an American hero whose achievements in space and on Earth will never be forgotten," tweeted NASA Administrator Jim Bridenstine.

A Slashdot reader shares NASA's remembrance: As command module pilot, Worden stayed in orbit while commander David Scott and lunar module pilot James B. Irwin explored the Moon's Hadley Rille and Appennine Mountains. Apollo 15's command module, dubbed Endeavour, was the first to have its own module of scientific instruments. During the flight back from the Moon, Worden retrieved film from cameras in the module during a spacewalk. Altogether, Worden logged more than 295 hours in space.

"The thing that was most interesting to me was taking photographs of very faint objects with a special camera that I had on board," Worden told Smithsonian Magazine in 2011. "These objects reflect sunlight, but it's very, very weak and you can't see it from [Earth]. There are several places between the Earth and the moon that are stable equilibrium points. And if that's the case, there has to be a dust cloud there. I got pictures of that."

Like other command module pilots, Worden stayed as busy as his colleagues on the surface. But he also took some time to enjoy the view. "Every time I came around the moon I went to a window and watched the Earth rise and that was pretty unique."

In 1972 Worden appeared twice on Mister Rogers Neighborhood. And Mister Rogers also filmed segments at Cape Canaveral, with Worden demonstrating his space suit and later supplying answers to a list of questions from children while standing in the mission's launch room.

"I asked Fred to let me take the list into space," Worden wrote in his autobiography. "I would think about them during the flight, I promised, and then answer when I returned."
Communications

Scientists Create Quantum Sensor That Covers Entire Radio Frequency Spectrum (phys.org) 64

A quantum sensor could give Soldiers a way to detect communication signals over the entire radio frequency spectrum, from 0 to 100 GHz, said researchers from the Army. Such wide spectral coverage by a single antenna is impossible with a traditional receiver system, and would require multiple systems of individual antennas, amplifiers and other components. Phys.Org reports: In 2018, Army scientists were the first in the world to create a quantum receiver that uses highly excited, super-sensitive atoms -- known as Rydberg atoms -- to detect communications signals, said David Meyer, a scientist at the U.S. Army Combat Capabilities Development Command's Army Research Laboratory. The researchers calculated the receiver's channel capacity, or rate of data transmission, based on fundamental principles, and then achieved that performance experimentally in their lab -- improving on other groups' results by orders of magnitude, Meyer said.

"These new sensors can be very small and virtually undetectable, giving Soldiers a disruptive advantage," Meyer said. "Rydberg-atom based sensors have only recently been considered for general electric field sensing applications, including as a communications receiver. While Rydberg atoms are known to be broadly sensitive, a quantitative description of the sensitivity over the entire operational range has never been done." To assess potential applications, Army scientists conducted an analysis of the Rydberg sensor's sensitivity to oscillating electric fields over an enormous range of frequencies -- from 0 to 1012 Hertz. The results show that the Rydberg sensor can reliably detect signals over the entire spectrum and compare favorably with other established electric field sensor technologies, such as electro-optic crystals and dipole antenna-coupled passive electronics.
The findings have been published in the Journal of Physics B: Atomic, Molecular and Optical Physics.
Earth

Greenland's Melting Ice Raised Global Sea Level By 2.2mm In Two Months (theguardian.com) 185

An anonymous reader quotes a report from The Guardian: Last year's summer was so warm that it helped trigger the loss of 600 billion tons of ice from Greenland -- enough to raise global sea levels by 2.2mm in just two months, new research has found. Unlike the retreat of sea ice, the loss of land-based glaciers directly causes the seas to rise, imperiling coastal cities and towns around the world. Scientists have calculated that Greenland's enormous ice sheet lost an average of 268 billion tons of ice between 2002 and 2019 -- less than half of what was shed last summer. By contrast, Los Angeles county, which has more than 10 million residents, consumes 1 billion tons of water a year.

"We knew this past summer had been particularly warm in Greenland, melting every corner of the ice sheet, but the numbers are enormous," said Isabella Velicogna, a professor of Earth system science at University of California Irvine and lead author of the new study, which drew upon measurements taken by Nasa's Gravity Recovery and Climate Experiment (Grace) satellite mission and its upgraded successor, Grace Follow-On. "In Antarctica, the mass loss in the west proceeds unabated, which is very bad news for sea level rise," Velicogna said. "But we also observe a mass gain in the Atlantic sector of east Antarctica caused by an increase in snowfall, which helps mitigate the enormous increase in mass loss that we've seen in the last two decades in other parts of the continent."

Cellphones

A Slashdotter's Take On a Way To Use Smartphones To Defeat the Coronavirus Pandemic 221

Longtime Slashdot reader dbart writes: With the near ubiquitous use of smartphones in America, it's sensible to seize upon this resource to help with the coronavirus pandemic. Here's my take on a way to use smartphones to deal with the pandemic:

America does not currently have a good coronavirus test -- but they are in development. Once a test is available there should be a smartphone app ready to deploy immediately. The app should work like this: A person would be tested for the virus at a testing station and the results of the test would be entered into the app's database. The person could then go about their business, such as going back to work. Upon arriving at the place of work, the person would bring up the app on their smartphone. The app would display some information to identify the subject that was tested along with a barcode. The employer would then scan in the barcode with the app on the employer's phone which will check with the central database and report back the results of their coronavirus test and the recency of the test. The employer would decide whether to allow the person into the workplace. This could similarly be used to safely allow entry to a restaurant, airplane, theater, sporting event, etc. -- thus getting the economy functioning again.

I've only presented a rough sketch of my idea about this above and there's many nuances to how this should work. It's obvious that everyone should be tested frequently for this to be effective. This would require testing on a massive scale, but considering the damage happening to the American economy, such massive testing could easily be justified. A capability as described above would get the American economy restarted at the soonest possible time and would allow society to function until a vaccine is available. It would also be a very valuable asset to epidemiological investigators. If an app was designed with enough forethought it could be deployed internationally. I'm hoping to get not just a Slashdot conversation but a larger conversation started about the use of technology to defeat this virus. Perhaps there's a Slashdotter with the skillsets to make this happen who would like to take this on. If anyone has a contact at the CDC please forward this post to them to insure that technological solutions such as this are being considered.
Medicine

Risky Hack Could Double Access To Ventilators As Coronavirus Peaks 77

An anonymous reader quotes a report from Motherboard: An emergency medicine physician says she and a colleague invented a way to connect four patients to a single ventilator, a hack that could significantly increase the capacity of overburdened hospitals during the coronavirus pandemic. Doctors Greg Neyman and Charelene Irvin Babcock published a pilot study of the technique in Academic Emergency Medicine in 2006. Babock is now an emergency medicine physician at a hospital in Detroit, Michigan and posted a YouTube video on March 14 describing the technique.

The technique is remarkably simple. "Four sets of standard ventilator tubing were connected to a single ventilator via two flow splitters," the study said. "Each flow splitter was constructed of three Briggs T-Tubes which included connection adapters with the valves removed." In Babock's video, she said the adapters were 22mm in size. Basically, any kind of T-shaped tube can be adapted to extend the ventilator to more than one patient. Babock's video has gone viral, and she told Motherboard in a phone interview that she put together the four way adapter set in her YouTube video in 15 minutes using supplies her hospital already had. In an interview with Motherboard, Babcock said that actually using it on coronavirus patients is a tough call, but a potentially life-saving one in a last-resort situation.
"It's only been done in test lungs," she said over the phone. "But it's probably better than nothing in dire circumstances. We don't know how bad it's gonna get. [Italy] is so overwhelmed with people that will die without ventilators and they don't have enough ventilators. Sometimes trying something almost MacGyverish is better than doing nothing."
Businesses

iFixit Is Building a Repair Database For Medical Equipment, and It Needs Your Help (theverge.com) 21

An anonymous reader quotes a report from The Verge: Repair specialist iFixit is building a database filled with repair information for the world's hospital equipment in anticipation of the increased demand caused by COVID-19, the disease caused by the novel coronavirus. In particular, it's calling for repair manuals for ventilators and BiPAP machines that can be used as ventilators. iFixit's database can be found here, and the company is calling for people to create new device pages and upload photographs and manuals.

There are currently few sources for repair manuals online. iFixit notes that resources like Frank's Hospital Workshop exist, but these are relatively small operations. Some manufacturers provide easy access to repair manuals on their websites, but others make them harder to find. There are a few different parts to iFixit's campaign beyond assembling a collection of manuals. Once it's got a manual, the company wants to format its information to make it as easy to understand as possible. It plans to break the manuals down into guides for individual repairs, to reformat them to make them more SEO-friendly, and to translate them into other languages. iFixit also wants to put together preventive maintenance guides so technicians can work to keep their equipment in good working order before it reaches the point of breaking down.
iFixit is also asking people in the medical community "to provide information about which ventilators are currently in use as well as which parts are most likely to break," the report adds. If you have any manuals to contribute, you can upload them to iFixit directly or email the company.
Medicine

What We Know So Far About SARS-CoV-2 (theatlantic.com) 214

We've known about SARS-CoV-2 for only three months, but scientists can make some educated guesses about where it came from and why it's behaving in such an extreme way. From a report: The structure of the virus provides some clues about its success. In shape, it's essentially a spiky ball. Those spikes recognize and stick to a protein called ACE2, which is found on the surface of our cells: This is the first step to an infection. The exact contours of SARS-CoV-2's spikes allow it to stick far more strongly to ACE2 than SARS-classic did, and "it's likely that this is really crucial for person-to-person transmission," says Angela Rasmussen of Columbia University. In general terms, the tighter the bond, the less virus required to start an infection. There's another important feature. Coronavirus spikes consist of two connected halves, and the spike activates when those halves are separated; only then can the virus enter a host cell. In SARS-classic, this separation happens with some difficulty. But in SARS-CoV-2, the bridge that connects the two halves can be easily cut by an enzyme called furin, which is made by human cells and -- crucially -- is found across many tissues. "This is probably important for some of the really unusual things we see in this virus," says Kristian Andersen of Scripps Research Translational Institute. Further reading: How the Coronavirus Could Take Over Your Body (Before You Ever Feel It)
NASA

At Long Last, NASA's Probe Finally Digs in On Mars (popsci.com) 19

NASA unsticks its Martian digging probe by whacking it with a shovel. From a report: Every day, the InSight lander's suite of instruments sends back data proving that the Red Planet isn't really dead. Marsquakes rumble the seismometer. Swirling vortices register on onboard pressure sensor. And temperature sensors help track the weather and changing of the seasons. Despite the lander's successes, however, one gauge has met with resistance from the Martian environment while trying to carry out its mission. Something has stopped InSight's 15-inch digging probe, dubbed "the mole" for its burrowing prowess. Instead of diving deep into the Martian sand where it could take the planet's temperature, it's been stuck half-buried. An intercontinental team of MacGyvers has spent a year devising successively daring plans to get the mole digging again, but still it flounders on the surface. Now their final gambit -- directly pushing the mole into the soil -- has shown tentative signs of success, NASA announced Friday on Twitter.

The goal of the mole, which is the measurement probe of InSight's Heat Flow and Physical Properties Package (or HP3), is to track the temperature variations of Mars itself. This heat comes from Mars's core, which, like Earth's core, remains warm from the planet's birth. By measuring it, researchers hope to learn about Mars's formation -- but from the rod-shaped mole's current position they can get readings only of the surface temperature. Mission planners hope to ideally reach 15 feet underground to escape the warming and cooling from the Martian seasons that would interfere with reading the planet's true temperature. A rock could be in the way, but the more likely culprit appears to be the Martian soil. Previous observations had led the German Aerospace Center engineers who designed the probe to expect that it would be digging through loose sand. They built the mole to bounce up and down like a jackhammer, sinking with each stroke and threading its way around any modestly sized rocks it encountered. But the probe has found soil that seems more dirt-like than sand-like; It sticks together and doesn't collapse around the mole to give it enough friction to dig. What the mole needs is a little nudge.

Medicine

CDC Launches Coronavirus Self-Checker Chatbot With the Help of Microsoft (inputmag.com) 31

The Centers for Disease Control and Prevention has collaborated with Microsoft to introduce the Coronavirus Self-Checker, a tool designed to better help you understand the disease which has caused over 10,000 confirmed cases in the United States and claimed at least 187 lives. From a report: The chatbot is another step Microsoft has taken to educate the public about the viral outbreak, after developing home-testing kits, a COVID-19 tracker tool, and a $100 million donation for global coronavirus research. At the very beginning of the chat, the bot asks if you are sick or if you have been in touch with someone who is sick. The conversation cuts short if you select no, noting that this "Coronavirus Self-Checker system is for those who may be sick." Although a considerable amount of data indicates that many COVID-19 carriers are asymptomatic or presymptomatic, the bot is specifically for individuals displaying visible symptoms of the virus.
Medicine

Search for Coronavirus Vaccine Becomes a Global Competition (nytimes.com) 137

A global arms race for a coronavirus vaccine is underway. The New York Times reports: In the three months since the virus began its deadly spread, China, Europe and the United States have all set off at a sprint to become the first to produce a vaccine. But while there is cooperation on many levels -- including among companies that are ordinarily fierce competitors -- hanging over the effort is the shadow of a nationalistic approach that could give the winner the chance to favor its own population and potentially gain the upper hand in dealing with the economic and geostrategic fallout from the crisis. What began as a question of who would get the scientific accolades, the patents and ultimately the revenues from a successful vaccine is suddenly a broader issue of urgent national security. And behind the scramble is a harsh reality: Any new vaccine that proves potent against the coronavirus -- clinical trials are underway in the United States, China and Europe already -- is sure to be in short supply as governments try to ensure that their own people are the first in line.

In China, 1,000 scientists are at work on a vaccine, and the issue has already been militarized: Researchers affiliated with the Academy of Military Medical Sciences have developed what is considered the nation's front-runner candidate for success and is recruiting volunteers for clinical trials. China "will not be slower than other countries," Wang Junzhi, a biological products quality control expert with the Chinese Academy of Sciences, said Tuesday at a news conference in Beijing. The effort has taken on propaganda qualities. Already, a widely circulated photograph of Chen Wei, a virologist in the People's Liberation Army, receiving an injection of what was advertised to be the first vaccine, has been exposed as a fake, taken before a trip she made to Wuhan, where the virus began. President Trump has talked in meetings with pharmaceutical executives about making sure a vaccine is produced on American soil, to assure the United States controls its supplies. German government officials said they believed he tried to lure a German company, CureVac, to do its research and production, if it comes to that, in the United States.

United States

Coronavirus Disruption Risks Damaging the 2020 United States Census (economist.com) 90

An anonymous reader quotes a report from The Economist: When the 2020 United States census, scheduled for April 1st, was planned, the areas of most concern were mapped. They include places like Deep East Texas, an area of 10,000 square miles north-east of Houston with a population of roughly 385,000 people. In large parts of the region most people do not have internet access. Many live in places only accessible with four-wheel drives. Counting everybody in Deep East Texas was never going to be easy. Now it looks like it may be near impossible. "The coronavirus has certainly complicated matters," says Lonnie Hunt, the director of the Deep East Texas Council of Governments (detcog), an intergovernmental agency. To help ensure an accurate count, detcog had hired a dozen census coordinators to go out to community events -- sports matches, church services, school sports days -- with information to persuade people to send their returns in, and internet hotspots and iPads with which to do it on the spot. Most of those events are now being cancelled. With people staying indoors, they probably will not encounter any of the workers meant to explain to them the importance of the census and get them to fill it in. The virus may represent the biggest threat to the United States census in its 230-year history.

So far the Census Bureau has only made modest changes. On March 18th the agency announced that all field operations are to be suspended until April 1st. On other surveys officials will make phone calls instead of visits. It has asked administrators of "group quarters" -- institutions like nursing homes, prisons and college dormitories -- to "choose a way to count their residents that requires less in-person contact." But more radical adjustments may be needed. Terri Ann Lowenthal, a former director of the House committee that oversees the census, notes that the count takes ten years to plan, and "yet now the Census Bureau is being forced to make shifts basically on the fly." On March 17th Brazil announced it would delay its census by a year. American officials might have to consider that, too.

Japan

Japan's Asteroid-Smashing Probe Reveals a Surprisingly Young Space Rock (space.com) 7

A reader shares a report from Space.com: A cannonball that Japan's Hayabusa2 probe fired at Ryugu, a 2,790-foot-wide near-Earth asteroid] is shedding light on the most common type of asteroid in the solar system, a new study reports. [...] The cannonball, dubbed the Small Carry-on Impactor (SCI), blasted out a crater about 47.5 feet (14.5 m) wide with an elevated rim and a central conical pit about 10 feet (3 m) wide and 2 feet (0.6 m) deep. The artificial crater was semicircular in shape, and the curtain of ejected material was asymmetrical. Both of these details suggest that there was a large boulder buried near the impact site, the researchers said.

This conclusion matches the rubble-pile picture that scientists already had of Ryugu. Features of the artificial crater and the plume suggested that the growth of a crater was limited mostly by the asteroid's gravity and not by the strength of the space rock's surface. This, in turn, suggested that Ryugu has a relatively weak surface, one only about as strong as loose sand, which is consistent with recent findings that Ryugu is made of porous, fragile material. These new findings suggest that Ryugu's surface is about 8.9 million years old, while other models suggested that the asteroid's surface might be up to about 158 million years old. All in all, while Ryugu is made of materials up to 4.6 billion years old, the asteroid might have coalesced from the remains of other broken-apart asteroids only about 10 million years ago, Arakawa said.
The findings have been published in the journal Science.
Cloud

NASA To Launch 247 Petabytes of Data Into AWS, But Forgot About Egress Costs Before Lift-Off 121

NASA needs 215 more petabytes of storage by the year 2025, and expects Amazon Web Services to provide the bulk of that capacity. However, the space agency didn't realize this would cost it plenty in cloud egress charges. As in, it will have to pay as scientists download its data. The Register reports: The data in question will come from NASA's Earth Science Data and Information System (ESDIS) program, which collects information from the many missions that observe our planet. NASA makes those readings available through the Earth Observing System Data and Information System (EOSDIS). To store all the data and run EOSDIS, NASA operates a dozen Distributed Active Archive Centers (DAACs) that provide pleasing redundancy. But NASA is tired of managing all that infrastructure, so in 2019, it picked AWS to host it all, and started migrating its records to the Amazon cloud as part of a project dubbed Earthdata Cloud. The first cut-over from on-premises storage to the cloud was planned for Q1 2020, with more to follow. The agency expects to transfer data off-premises for years to come.

NASA also knows that a torrent of petabytes is on the way. Some 15 imminent missions, such as the NASA-ISRO Synthetic Aperture Radar (NISAR) and the Surface Water and Ocean Topography (SWOT) satellites, are predicted to deliver more than 100 terabytes a day of data. We mention SWOT and NISAR because they'll be the first missions to dump data directly into Earthdata Cloud. The agency therefore projects that by 2025 it will have 247 petabytes to handle, rather more than the 32 it currently wrangles. NASA thinks this is all a great idea. And it will -- if NASA can afford to operate it. And that's a live question because a March audit report [PDF] from NASA's Inspector General noticed EOSDIS hadn't properly modeled what data egress charges would do to its cloudy plan.
NASA "has not yet determined which data sets will transition to Earthdata Cloud nor has it developed cost models based on operational experience and metrics for usage and egress," the Inspector General's Office wrote. "As a result, current cost projections may be lower than what will actually be necessary to cover future expenses and cloud adoption may become more expensive and difficult to manage."

"Collectively, this presents potential risks that scientific data may become less available to end users if NASA imposes limitations on the amount of data egress for cost control reasons."
United States

California Governor Issues Statewide Order To 'Stay At Home' To Prevent Spread of the Coronavirus (cnbc.com) 418

All residents in the state of California are being ordered to "stay at home" to prevent the spread of the coronavirus. "We need to bend the curve in the state of California," Governor Gavin Newsom said in a press conference. "There's a social contract here, people I think recognize the need to do more. They will adjust and adapt as they have." Newsom added: "Home isolation is not my preferred choice... but it is a necessary one. This is not a permanent state, it is a moment in time."

As of publication, 19 people in California have died and another 958 have tested positive for the disease. "The state projects that 25.5 million people in California will be infected with the coronavirus over an eight-week period," reports Los Angeles Times, citing a letter Newsom sent to President Trump on Wednesday. Newsom is requesting $1 billion in federal funds to support the state's medical response to the virus. He's also requesting the deployment of the U.S. Navy's Mercy Hospital Ship to the Port of Los Angeles through Sept. 1.

"The economic disruption caused by this public health crisis will have immediate and devastating effects on our entire country, including too many families in California," Newsom wrote. "The magnitude of this crisis is extraordinary and federal-state-local government coordination will be more critical than ever before."
The Internet

Experts Say the Internet Will Mostly Stay Online During Coronavirus Pandemic (vice.com) 21

As millions of Americans hunker down to slow the spread of COVID-19, U.S. broadband networks are seeing a significant spike in usage. While industry insiders say that the U.S. internet should be able to handle the strain overall, broadband availability, affordability, and slow speeds could still pose a serious problem for many housebound U.S. residents. From a report: In a blog post, Cloudflare noted that Seattle, ground zero for the U.S. coronavirus spread, has seen internet usage spike by some 40 percent. Key internet exchanges in cities like Amsterdam, London, and Frankfurt have seen a 10 to 20 percent spike in traffic since around March 9. ISPs use a number of modern network technologies to handle congestion in real time, often letting them intelligently and automatically "deprioritize" the traffic of heavy users in overloaded areas. Even then, the massive surge in usage will likely impact U.S. broadband speeds in the weeks and months to come, industry trackers say. Broadband Now, a company that tracks U.S. broadband availability and speed, told Motherboard that six of the biggest U.S. cities by population have seen little to no change in median speed test results from the past 11 weeks.
Medicine

Gaming Peripheral Company Razer Shifts Some Production To Surgical Masks (polygon.com) 28

Razer CEO Ming-Liang Tan announced on Thursday that the company will shift a number of its manufacturing lines from producing its own products to making surgical masks. Polygon reports: As COVID-19, the disease caused by the novel coronavirus, continues to spread around the world, healthcare officials are reporting shortages of essential resources, including surgical masks. Tan said Razer intends donate up to 1 million masks to healthcare providers globally; its first shipments will go to healthcare authorities in Singapore, where Razer's Southeast Asia headquarters is located.

The Razer CEO said designers and engineers have been working "24-hour shifts" to convert the company's production lines. "While there has been incredible demand for our products during this time with many staying home to avoid the crowds (and to play games), the team at Razer understands that all of us have a part to play in fighting the virus -- no matter which industry we come from," Tan said. He added that "emergency conversion" of Razer's manufacturing lines is the first step in the company's plan. "We are committed to contributing our extra time, resources, effort and talent toward the fight against COVID-19," Tan said.
Elon Musk said on Twitter that Tesla "would make ventilators if there is a shortage." This prompted New York City Mayor Bill De Blasio to tweet out the plea: "Our country is facing a drastic shortage and we need ventilators ASAP -- we will need thousands in this city over the next few weeks. We're getting them as fast as we can but we could use your help!"
Medicine

Open-Source Project Spins Up 3D-Printed Ventilator Validation Prototype In Just One Week (techcrunch.com) 48

An anonymous reader quotes a report from TechCrunch: In a great example of what can happen when smart, technically-oriented people come together in a time of need, an open-source hardware project started by a group including Irish entrepreneur Colin Keogh and Breeze Automation CEO and co-founder Gui Calavanti has produced a prototype ventilator using 3D-printed parts and readily available, inexpensive material. The ventilator prototype was designed and produced in just seven days, after the project spun up on Facebook and attracted participation from over 300 engineers, medical professionals and researchers.

The prototype will now enter into a validation process by the Irish Health Services Executive (HSE), the country's health regulatory body. This will technically only validate it for use in Ireland, which ironically looks relatively well-stocked for ventilator hardware, but it will be a key stamp of approval that could pave the way for its deployment across countries where there are shortages, including low-income nations. The group behind the ventilator also recently changed the focus of their Facebook community, renaming the group from the Open Source Ventilator Project to the Open Source COVID19 Medical Supplies community. They're looking at expanding their focus to finding ways to cheaply and effectively build and validate other needed equipment, including protective gear like masks, sanitizer and protective face guards for front-line healthcare workers.

Twitter

Twitter Broadly Bans Any COVID-19 Tweets That Could Help the Virus Spread (techcrunch.com) 169

An anonymous reader quotes a report from TechCrunch: On Wednesday, Twitter updated its safety policy to prohibit tweets that "could place people at a higher risk of transmitting COVID-19." The new policy bans tweets denying expert guidance on the virus, encouraging "fake or ineffective treatments, preventions and diagnostic techniques" as well as tweets that mislead users by pretending to be from health authorities or experts. In its blog post, Twitter says that it will "require people to remove Tweets" in these cases and we've asked the company for more clarification on what that looks like.

Twitter indicated that it will take context like account history into account in making its enforcement determinations, which it says remain unchanged. As far as having users remove offending tweets, according to the company's existing guidance "When we determine that a Tweet violated the Twitter Rules, we require the violator to remove it before they can Tweet again." A user is notified of this via email and given a chance to delete the tweet or make an appeal. While that is happening, the tweet is hidden from view. Under the ruleset, a tweet that claims "social distancing is not effective" would be subject to removal. Twitter will also require users to delete tweets telling followers to do ineffective or dangerous things like drinking bleach, even if the tweet is "made in jest" because that content can prove harmful when taken out of context.
Twitter is banning tweets encouraging people to behave in a way counter to what health authorities recommend. The rules will also prohibit users from playing armchair doctor, as well as making coronavirus claims that single out groups of people based on race or nationality.
Medicine

FDA Testing Coronavirus Treatments, Including Chloroquine, Plasma From Recovered COVID-19 Patients (techcrunch.com) 135

U.S. Food and Drug Administration Commissioner Stephen Hahn addressed the ongoing work of the agency in terms of its work on potential treatments and vaccines for the COVID-19 coronavirus currently spreading globally. From a report: Despite a claim early in Thursday's White House briefing on the pandemic by President Donald Trump that one proposed treatment, anti-malarial chloroquine, had already been approved by the FDA for COVID-19 treatment, Hahn said that in fact the agency is currently looking at widespread clinical trials of the drug, but it is not yet approved for that use. "In the short term, we're looking at drugs that are already approved for other indications," Dr. Hahn said.

"Many Americans have read studies and heard media reports about this drug chloroquine, which is an anti-malarial drug. It's already approved, as the president said, for the treatment of malaria [Trump had not said this, but had instead said it was now approved for COVID-19] as well as an arthritis condition. That's a drug that the president has directed us to take a closer look at, as to whether an expanded use approach to that could be done to actually see if that benefits patients. And again, we want to do that in the setting of a clinical trial, a large pragmatic clinical trial to actually gather that information and answer the question that needs to be answered." Another potential treatment which has shown signs of possible positive effect, remdesivir, was also cited by Trump as being very "near" approval for use by the FDA. Hahn clarified that in fact, while remdesivir is currently undergoing clinical trials, it's following the normal FDA process for approval for clinical medical therapeutic use in the U.S.

Medicine

99% of Those Who Died From Virus Had Other Illness, Italy Says (bloomberg.com) 257

More than 99% of Italy's coronavirus fatalities were people who suffered from previous medical conditions, according to a study [PDF] by the country's national health authority. Reader schwit1 shares a report: The new study could provide insight into why Italy's death rate, at about 8% of total infected people, is higher than in other countries. The Rome-based institute has examined medical records of about 18% of the country's coronavirus fatalities, finding that just three victims, or 0.8% of the total, had no previous pathology. Almost half of the victims suffered from at least three prior illnesses and about a fourth had either one or two previous conditions. More than 75% had high blood pressure, about 35% had diabetes and a third suffered from heart disease.

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