The drugmaker Moderna announced on Monday that its coronavirus vaccine was 94.5 percent effective, based on an early look at the results from its large, continuing study.
Researchers said the results were better than they had dared to imagine. But the vaccine will not be widely available for months, probably not until spring.
Despite the delivery timeline, this is such good news.
The companies’ products open the door to an entirely new way of creating vaccines — and creating them fast. Both use a synthetic version of coronavirus genetic material, called messenger RNA or mRNA, to program a person’s cells to churn out many copies of a fragment of the virus. That fragment sets off alarms in the immune system and stimulates it to attack, should the real virus try to invade. Although a number of vaccines using this technology are in development for other infections and cancers, none have yet been approved or marketed.
“The fact that two different vaccines made by two different companies with two different kinds of structures, in a new messenger RNA concept, both worked so effectively confirms the concept once and for all that this is a viable strategy not only for Covid but for future infectious disease threats,” said Dr. Barry R. Bloom, a professor of public health at Harvard.
Natalie E. Dean, a biostatistician at the University of Florida, said an important finding was that the vaccine appeared to prevent severe disease. Pfizer did not release information about disease severity when reporting its results.
Researchers say the positive results from Pfizer and Moderna bode well for other vaccines, because all of the candidates being tested aim at the same target - the so-called spike protein on the coronavirus that it uses to invade human cells.
It’s only a few more months — please please do what you can to stay safe and keep others safe (especially medical workers) until these vaccines can be rolled out.
The list includes Rick Bright, the former head of the vaccine-development agency BARDA ousted by the Trump administration in April; Atul Gawande, the surgeon, writer, and recently departed CEO of Haven, the joint JP Morgan Chase-Berkshire Hathaway-Amazon health care venture; and Luciana Borio, a former Food and Drug Administration official and biodefense specialist.
Biden has cast the escalating Covid-19 crisis as a priority for his incoming administration. The task force, he said, would quickly consult with state and local health officials on how to best prevent coronavirus spread, reopen schools and businesses, and address the racial disparities that have left communities of color harder hit than others by the pandemic.
Ensure all Americans have access to regular, reliable, and free testing.
Fix personal protective equipment (PPE) problems for good.
Provide clear, consistent, evidence-based guidance for how communities should navigate the pandemic — and the resources for schools, small businesses, and families to make it through.
Plan for the effective, equitable distribution of treatments and vaccines - because development isn’t enough if they aren’t effectively distributed.
Protect older Americans and others at high risk.
Rebuild and expand defenses to predict, prevent, and mitigate pandemic threats, including those coming from China.
Implement mask mandates nationwide by working with governors and mayors and by asking the American people to do what they do best: step up in a time of crisis.
This looks like what the plan should have been from the beginning. Of particular note, under the point about testing:
Stand up a Pandemic Testing Board like Roosevelt’s War Production Board. It’s how we produced tanks, planes, uniforms, and supplies in record time, and it’s how we will produce and distribute tens of millions of tests.
Establish a U.S. Public Health Jobs Corps to mobilize at least 100,000 Americans across the country with support from trusted local organizations in communities most at risk to perform culturally competent approaches to contact tracing and protecting at-risk populations.
Over the past week, as Americans voted and then held their breath for the results of the election, over 750,000 Americans tested positive for Covid-19. Based on the current case fatality rate of 2.4%, over 18,000 of those people will die in the days and weeks ahead. Many more will suffer long-term health effects because of the disease and struggle emotionally, financially, and spiritually in the months ahead. I really really hope there’s enough of a spirit of togetherness and cooperation left in America for a science-based plan like this to work in controlling a disease that’s killed almost 230,000 people. We — all Americans — need this so so much.
In a press release (and not a paper in a peer-reviewed journal) based on a preliminary outside review of data from its phase 3 trial, Pfizer says its Covid-19 vaccine was more than 90% effective in preventing the disease.
The company said that the analysis found that the vaccine was more than 90 percent effective in preventing the disease among trial volunteers who had no evidence of prior coronavirus infection. If the results hold up, that level of protection would put it on par with highly effective childhood vaccines for diseases such as measles. No serious safety concerns have been observed, the company said.
I really hope this analysis holds up when more data from the study is released:
The data released by Pfizer Monday was delivered in a news release, not a peer-reviewed medical journal. It is not conclusive evidence that the vaccine is safe and effective, and the initial finding of more than 90 percent efficacy could change as the trial goes on.
The world, and the United States, could really really use some good news like this about the pandemic.
Pfizer’s first analysis was planned for 32 events, which they pushed back after discussions with FDA. But by the time they analyzed the data, 94 had accrued. This shows how quickly trials can generate results when placed in hotspots (and how much transmission is ongoing!).
These vaccines are tested until a certain number of infections happen. So you have this interesting paradoxical situation where if a potential vaccine is more successful at curbing infection, the longer it takes for the study to conclude. You get a better vaccine but wait longer for it. Countering that are the rising transmission counts in the US — more community transmission will get you to the target number of infections more quickly.
Update: From virologist Dr. Florian Krammer, a thread about what Pfizer and other companies will be looking for in terms of the efficacy of vaccines in a number of different situations. Overall, he is optimistic about these preliminary results. And here’s a FAQ about the vaccine from the NY Times.
Another open question is whether children will get protection from the vaccine. The trial run by Pfizer and BioNTech initially was open to people 18 or older, but in September they began including teenagers as young as 16. Last month, they launched a new trial on children as young as 12 and plan to work their way to younger ages.
Let’s say the Earth turned into a black hole. What would happen to someone standing on the surface and for how long would it happen? From Ethan Siegel:
As spectacular as falling into a black hole would actually be, if Earth spontaneously became one, you’d never get to experience it for yourself. You’d get to live for about another 21 minutes in an incredibly odd state: free-falling, while the air around you free-fell at exactly the same rate. As time went on, you’d feel the atmosphere thicken and the air pressure increase as everything around the world accelerated towards the center, while objects that weren’t attached to the ground would appear approach you from all directions.
The NY Times has a fantastic visualization on how face masks help keep us safe from catching Covid-19 by taking readers on a journey through a mask to see how they block aerosols and droplets.
A lot of the pushback around the efficacy of masks from non-scientists focuses on the size of the droplets and aerosols (super tiny) compared to the gaps between the fibers in the masks (relatively large). Intuitively, it seems like masks don’t stand a chance of stopping anything. But as this visualization shows, multiple layers of fibers do the job quite well. Masks don’t work like sieves, which will let every particle smaller than the holes through the mesh. Instead, imagine shooting a BB gun into a thick stand of trees — no one tree stands a good chance of getting hit by the BB but the forest will stop it eventually.
N95, KN95, and masks made from polypropylene have an extra weapon against particles: the fibers carry an electrostatic charge that attracts particles to trap them. Picture our BB flying through a forest of magnetic trees — it’s got a much better chance of being captured that way.
The visualization also touches on the importance of making sure your mask fits properly. The best masks fit tightly around the edges and include a space around your nose and nostrils. Masks with unfiltered valves should not be used — you’re just breathing virus out into the air. It’s been 8-9 months now that we’ve been dealing with the pandemic and there will be many more months of wearing masks. If your mask is fits poorly around your nose, your straps aren’t tight enough, you need to fuss with it after putting it on, have a mask with a valve, or (god forbid) are still just wearing a bandana, please please do yourself and others a favor and upgrade your mask. High-quality, well-made masks are much easier to find now than 6-8 months ago.1 If you can’t afford a proper mask, email me and I’ll buy you one. Masks are one of the most successful low-tech interventions we can do to prevent the spread of Covid-19, and the better our masks, the more effective they will be.
I am hesitant in recommending particular masks because I am not a doctor or scientist, but you might want to look at Airpop’s masks. I also recently bought some Vida KN95s (but have not worn one yet). My daily mask is this Allett mask that combines a cotton layer with a non-woven polypropylene layer (I wouldn’t wear this on a plane for 4 hours but for 10 minutes in the grocery store in Vermont where community transmission levels are low, it’s fine). It’s more comfortable than a straight KN95 and fits my face perfectly — no “bunching up” gap between the ear loops or around the nose. Disposable surgical masks are very easy to find — they are better than wearing a bandana, valved mask, or even a thin cotton mask.↩
From El Pais, this is an excellent visualization of how Covid-19 spreads indoors via aerosols and what can be done to limit that spread. They go through simulations of three different indoor scenarios that are based on actual events — in a home with friends, in a bar at 50% capacity, and in a classroom — and see what happens when differing levels of precautions are applied: masks, ventilation, and limiting exposure time.
Six people get together in a private home, one of whom is infected. Some 31% of coronavirus outbreaks recorded in Spain are caused by this kind of gathering, mainly between family and friends.
Irrespective of whether safe distances are maintained, if the six people spend four hours together talking loudly, without wearing a face mask in a room with no ventilation, five will become infected, according to the scientific model explained in the methodology.
If face masks are worn, four people are at risk of infection. Masks alone will not prevent infection if the exposure is prolonged.
The risk of infection drops to below one when the group uses face masks, shortens the length of the gathering by half and ventilates the space used.
In all three scenarios, note that distancing is largely irrelevant when people gather indoors for longer periods in poorly ventilated areas. From the school example:
In real outbreaks, it has been noted that any of the students could become infected irrespective of their proximity to the teacher as the aerosols are distributed randomly around the unventilated room.
The only thing that’s disappointing about this piece is that it does not stress enough that finding alternatives to indoor activities with lots of people is the much safer course of action than just cracking a window or masking up. Safety step #1 is still being smart about non-essential activities — masks and ventilation are not magically going to protect you during risky activities. Educating our children is important and difficult (though not impossible) to do outside in many places, so yeah, let’s mask up and ventilate those classrooms. But your indoor birthday party with 10 friends or Thanksgiving dinner with the cousins and grandparents? Or dining out in a room full of strangers at a restaurant? Even with masks and ventilation, it’s not a great idea. Scale it down, move it to Zoom/FT, hold it outdoors (distanced, masked), or just skip it.
Using the Dark Energy Camera at the Cerro Tololo observatory in Chile, astronomers took an image of the stars clustered around the center of our Milky Way galaxy that shows about 10 million stars. Check out the zoomable version for the full experience.
Looking at an image like this is always a bit of a brain-bender because a) 10 million is a huge number and b) the stars are so tightly packed into that image and yet c) that image shows just one tiny bit of our galactic center, d) our entire galaxy contains so many more stars than this (100-400 billion), and e) the Universe perhaps contains as many as 2 trillion galaxies. And if I’m remembering my college math correctly, 400 billion × 2 trillion = a metric crapload of stars. (via bad astronomy)
A spin studio (aka an indoor gym with stationary bikes) in Hamilton, Ontario is dealing with an outbreak of Covid-19 stemming from one asymptomatic patron that has resulted in 69 positive cases so far, even though the studio “followed the rules”. From the CNN report:
SPINCO, in Hamilton, Ontario, just reopened in July and had all of the right protocols in place, including screening of staff and attendees, tracking all those in attendance at each class, masking before and after classes, laundering towels and cleaning the rooms within 30 minutes of a complete class, said Dr. Elizabeth Richardson, Hamilton’s medical officer of health, in a statement.
Although Hamilton requires masks to be worn in most public settings, the law includes an exemption for anyone “actively engaged in an athletic or fitness activity.” In keeping with that policy, the studio, SPINCO, allowed riders to remove their masks once clipped into their bikes, and told them to cover up again before dismounting.
The problem here is that while the studio may have followed the rules, they were not the right rules. This outbreak appears to be another clear-cut instance of Covid-19 spread by aerosols. A group of people indoors, without masks, breathing heavily, over long periods of time in what I’m guessing is not a properly ventilated room — this is exactly the sort of thing that has been shown over and over again to be problematic.1The science is there, but governments and public health agencies have not caught up with this yet. If you take the transmission by aerosols into account, the rules for gyms (and bars and restaurants) being open is that they should probably not be open at all — or if they are, they should be well-ventilated and the wearing of masks should be mandatory at all times.2 (via @DrEricDing)
To return once again to aerosol expert Jose-Luis Jimenez’s excellent smoke analogy, attending a spin class with an asymptomatic patron who is breathing heavily is like being in a room with someone who is furiously chain-smoking for an hour. Unless that room is extremely well-ventilated, everyone is going to be breathing in so much smoke.↩
And to compensate these businesses for their public service in remaining closed, they should be financially supported by the government. We cannot let these businesses, especially small businesses, and their owners go under, for people to lose their savings or go bankrupt, etc. as they help keep the rest of us safe. If we want to have bars and restaurants and gyms and movie theaters and concert venues on the other side of this pandemic, they have to be compensated for their sacrifice on our behalf.↩
We’re all so goddamned tired of this fucking pandemic and so people are looking at the development and distribution of a vaccine as the thing that’s going to get us out of this (and quick). But realistically, that’s not what’s going to happen. Carl Zimmer wrote about some of the challenges with Covid-19 vaccines.
The first vaccines may provide only moderate protection, low enough to make it prudent to keep wearing a mask. By next spring or summer, there may be several of these so-so vaccines, without a clear sense of how to choose from among them. Because of this array of options, makers of a superior vaccine in early stages of development may struggle to finish clinical testing. And some vaccines may be abruptly withdrawn from the market because they turn out not to be safe.
“It has not yet dawned on hardly anybody the amount of complexity and chaos and confusion that will happen in a few short months,” said Dr. Gregory Poland, the director of the Vaccine Research Group at the Mayo Clinic.
See also Dr. Fauci’s belief that our best case scenario for returning to something close to normal life in the US is late 2021.
On Twitter, Zimmer also commented on something that I hadn’t really thought about: that all of these vaccines in development in the US are only for adults:
I wrote last month that no trials for kids had started. Update: still no US trials for kids. The goal of having shots ready for them by fall 2021 may be slipping further away.
Only if researchers discovered no serious side effects would they start testing them in children, often beginning with teenagers, then working their way down to younger ages. Vaccine developers are keenly aware that children are not simply miniature adults. Their biology is different in ways that may affect the way vaccines work. Because their airways are smaller, for example, they can be vulnerable to low levels of inflammation that might be harmless to an adult.
These trials allow vaccine developers to adjust the dose to achieve the best immune protection with the lowest risk of side effects. The doses that adults and children need are sometimes different — children get smaller doses of hepatitis B vaccines, for example, but bigger doses for pertussis.
You probably hate reading these kinds of articles; I know I do. But facing up to the reality of our situation, particularly here in the US where our political leadership has utterly failed in protecting us from this virus, is much better than burying our heads in the sand — that’s just not mentally healthy.
This is a great piece from Carl Zimmer about how much scientists have learned about SARS-CoV-2 through imaging, including how the virus works and prospects for treatment and a vaccine.
Thanks to the work of scientists like Dr. Li, the new coronavirus, known as SARS-CoV-2, is no longer a cipher. They have come to know it in intimate, atomic detail. They’ve discovered how it uses some of its proteins to slip into cells and how its intimately twisted genes commandeer our biochemistry. They’ve observed how some viral proteins throw wrenches into our cellular factories, while others build nurseries for making new viruses. And some researchers are using supercomputers to create complete, virtual viruses that they hope to use to understand how the real viruses have spread with such devastating ease.
I’ve been watching the lectures for MIT’s online Covid-19 class and the thing that has struck me most is just how much scientists have learned about the SARS-CoV-2 virus in such a short amount of time. To be clear, there are many things that they still do not understand about it (and viruses in general), but scientists know this thing upside down and backwards. The depth and breadth of their knowledge is so impressive and I wish more people were aware of it.
In an article that The Atlantic classifies as “politics” rather than “science” or “medicine”, Olga Khazan explores why, more than 8 months into the pandemic, Americans still have little idea about the safety of gathering with others indoors.
For months now, Americans have been told that if we want to socialize, the safest way to do it is outdoors, the better to disperse the droplets that spew from our mouths whenever we do anything but silently purchase grapefruit. But in many parts of the country, this is the last month that the weather will allow people to spend more than a few minutes outside comfortably. And next month, America will celebrate a holiday that is marked by being inside together and eating while talking loudly to old people.
In a nutshell, the lack of federal support/guidance/action is the main reason why people are still so confused about what safety measures to take to reduce their Covid risk:
Still, Ranney says, this [Covid risk] app is the kind of thing the federal government really should have developed by now. It’s odd that in a wealthy, industrialized country, a random researcher is the one designing a tool to keep citizens safe from public-health threats, using data she scraped from a newspaper.
One thing that Khazan doesn’t really get into is the whole aerosols thing, which in my mind is something that most people are still not familiar with, many local & state governments are not taking into account w/r/t recommended safety measures, and requires different risk guidance about the safety of the indoors than if we were just dealing with fomites & droplets. Again, from the excellent Time magazine piece by aerosol chemist Jose-Luis Jimenez:
When it comes to COVID-19, the evidence overwhelmingly supports aerosol transmission, and there are no strong arguments against it. For example, contact tracing has found that much COVID-19 transmission occurs in close proximity, but that many people who share the same home with an infected person do not get the disease. To understand why, it is useful to use cigarette or vaping smoke (which is also an aerosol) as an analog. Imagine sharing a home with a smoker: if you stood close to the smoker while talking, you would inhale a great deal of smoke. Replace the smoke with virus-containing aerosols, which behave very similarly, and the impact is similar: the closer you are to someone releasing virus-carrying aerosols, the more likely you are to breathe in larger amounts of virus. We know from detailed, rigorous studies that when individuals talk in close proximity, aerosols dominate transmission and droplets are nearly negligible.
If you are standing on the other side of the room, you would inhale significantly less smoke. But in a poorly ventilated room, the smoke will accumulate, and people in the room may end up inhaling a lot of smoke over time. Talking, and especially singing and shouting increase aerosol exhalation by factors of 10 and 50, respectively. Indeed, we are finding that outbreaks often occur when people gather in crowded, insufficiently ventilated indoor spaces, such as singing at karaoke parties, cheering at clubs, having conversations in bars, and exercising in gyms. Superspreading events, where one person infects many, occur almost exclusively in indoor locations and are driving the pandemic. These observations are easily explained by aerosols, and are very difficult or impossible to explain by droplets or fomites.
The science is there — it’s the lack of connection between scientists, public health experts & officials, and the government that continues to be a problem.
With a very effective vaccine ready in Nov/Dec, distributed widely, and if lots of people take it (i.e. the best case scenario), the earliest we could return to “normal life” in the world is the end of 2021.
At the New Yorker Festival earlier in the week, Michael Specter asked him about a return to normalcy and Fauci elaborated a bit more on this timeline (starts ~10:22 in the video).
When are we gonna get back to something that closely resembles, or is in fact, normal as we knew it?
We’re already making doses, tens and hundreds of millions of doses to be ready, first at least, in graded numbers at the end of the year in November/December. By the time we get to April, we likely will have doses to be able to vaccinate anybody who needs to be vaccinated. But logistically by the time you get everybody vaccinated, it likely will not be until the third or even the beginning of the fourth quarter of 2021.
So let’s say we get a 70% effective vaccine, which I hope we will get, but only 60% of the people get vaccinated. There are going to be a lot of vulnerable people out there, which means that the vaccine will greatly help us to pull back a bit on the restrictions that we have now to maintain good public health, but it’s not going to eliminate things like mask wearing and avoiding crowds and things like that.
So I think we can approach normality, but I don’t think we’re going to be back to normal until the end of 2021. We may do better than that; I hope so but I don’t think so.
Leaving aside what “normal” might mean and who it actually applies to,1 there’s some good news and bad news in there. The good news is, they’re already producing doses of the vaccine to be ready if and when the phase 3 trials are successful. Ramping up production before the trials conclude isn’t usually done because it’s a waste of money if the trials fail, but these vaccines are so critical to saving lives that they’re spending that money to save time. That’s great news.
The bad news is that we’re not even halfway through the pandemic in the best case scenario. We’re going to be wearing masks in public for at least another year (and probably longer than that). Large gatherings of people (especially indoors) will continue to be problematic — you know: movie theaters, concerts, clubs, bars, restaurants, schools, and churches — and folks staying within small pods of trusted folks will likely be the safest course of action.
A change in national leadership in both the executive branch and Senate could change the outlook for the better. We could get some normalcy back even without a vaccine through measures like a national mask mandate/distribution, a real national testing & tracing effort, taking aerosol transmission seriously, and easing the economic pressure to “open back up” prematurely. We’re never going to do as well as Vietnam or Taiwan, but I’d settle for Greece or Norway.
Topol: When do you think we’ll see pre-COVID life restored?
Rivers: I wish I knew. I’m thinking toward the end of 2021. It’s really hard to say with any certainty. We should all be mentally prepared to have quite a bit ahead of us.
It’s America. If we know anything by now about this country, it’s that access to healthcare and economic opportunity is going to apply unevenly to the people who live here. For instance, it’s likely that Black & brown communities, which have been disproportionately affected by the pandemic, may face difficulty in getting access to vaccines compared to wealthier, predominantly white communities.↩
Back in June, in a post called Jesus Christ, Just Wear a Face Mask!, I presented a bunch of evidence and arguments for wearing face masks to prevent the spread of Covid-19. Even then it was pretty clear that masks were working. In piece published by Nature yesterday, Lynne Peeples summarizes what the data and science currently says about the effectiveness of wearing face masks. Here is her one-sentence summary:
To be clear, the science supports using masks, with recent studies suggesting that they could save lives in different ways: research shows that they cut down the chances of both transmitting and catching the coronavirus, and some studies hint that masks might reduce the severity of infection if people do contract the disease.
And importantly, even ardently pro-mask scientists agree that masks should be worn in conjunction with taking other precautions: limiting large gatherings, maintaining distance, limiting the time you spend indoors with others, etc.
In this unique feature documentary, titled David Attenborough: A Life On Our Planet, the celebrated naturalist reflects upon both the defining moments of his lifetime and the devastating changes he has seen. Coming to Netflix October 4 2020, the film addresses some of the biggest challenges facing life on our planet, providing a snapshot of global nature loss in a single lifetime. With it comes a powerful message of hope for future generations as Attenborough reveals the solutions to help save our planet from disaster.
In the trailer (embedded above), Attenborough says “I had the most extraordinary life. It’s only now that I appreciate how extraordinary.” In saying that, he’s speaking not only as a living legend whose long career in television and science has brought him nearly universal acclaim, but also as someone who can look back and see how recognizably and thoroughly the Earth has changed during his lifetime. The depletion of animal populations, the changing climate, the shifting habitats — he’s witnessed firsthand how much humans have fucked up the planet. We should listen to his testimony and suggestions for fixing what he calls “our greatest mistake”. I hope it’s not too late.
The birds were aware of what they subjectively perceived, flash or no flash, correctly reporting what their sensory neurons recorded, Nieder told STAT. “I think it demonstrates convincingly that crows and probably other advanced birds have sensory awareness, in the sense that they have specific subjective experiences that they can communicate,” he said. “Besides crows, this kind of neurobiological evidence for sensory consciousness only exists in humans and macaque monkeys.”
In secrecy over the past several months, filmmaker Alex Gibney has been making a documentary film about the US government’s response to the Covid-19 pandemic called Totally Under Control. He and co-directors Ophelia Harutyunyan and Suzanne Hillinger interviewed “countless scientists, medical professionals, and government officials on the inside” to produce the film.
Academy Award-winning filmmaker Alex Gibney, directing with Ophelia Harutyunyan and Suzanne Hillinger, interrogates this question and its devastating implications in Totally Under Control. With damning testimony from public health officials and hard investigative reporting, Gibney exposes a system-wide collapse caused by a profound dereliction of Presidential leadership.
Gibney previously directed Enron: The Smartest Guys in the Room, Going Clear, and Zero Days (all excellent documentaries). The film comes out in theaters on October 13 and on Hulu on October 20.
A group of scientists who believe that WHO and the CDC are being too slow in acknowledging the role of aerosol transmission in spreading Covid-19 have written up a Google Doc of advice for the public: FAQs on Protecting Yourself from COVID-19 Aerosol Transmission.
The goal of these FAQs is to provide information to the general public in an efficient manner about how to prevent aerosol transmission of COVID-19, with the hope that this will allow more informed decision making by individuals or organizations. All of this information has been posted in Twitter and other forums, but can be difficult to find. Having multiple experts working together, and having the ability to update this information also improves its quality. These FAQs represent our best understanding at this time, and should always be similar or more stringent than information provided by CDC, WHO, and most regional & local health authorities. If your authority has a more stringent guideline than discussed here, follow that more stringent guideline.
The group was organized by chemist Jose-Luis Jimenez, who has been studying aerosols for 20 years. You may remember Jimenez from his excellent piece in Time magazine, where he used the analogy of smoke to explain aerosol transmission. Here’s a snippet from the FAQ, highlighting something I’ve been concerned about lately: people wearing face shields instead of masks and employees in stores not wearing masks behind plexiglass shields:
7.13. Are face shields and masks interchangeable? No, face shields do not offer much protection against aerosols (also see this video), while masks do. Face shields are good for blocking ballistic droplets released by the wearer or that might fly into the wearer’s face when close to others. Face shields are considered a supplement to masks for partial eye protection (but less useful than closed glasses, as discussed above), but not a substitute for them.
7.14. Are plexiglass barriers helpful?
Plexiglass barriers are generally useful to avoid direct droplet infection and direct aerosol transmission whenever people are in close proximity and distance cannot be kept. Therefore, it is recommended to use them as a direct transmission suppression tool at such places, such as a supermarket checkout.
However, as aerosols follow the air movements indoors, the protective effects of the plexiglas barriers against aerosols will be limited. Plexiglas barriers alone are not a sufficient approach to protect against aerosol transmission. Their installation alone cannot protect against indoor aerosol transmission and should not be regarded as safe and sufficient protection.
We update the document all the time. We’re effectively having to be a little WHO or CDC. We’re saying the things that they should be saying. This is frustrating, but it’s the situation we find ourselves in. These organizations have been flat-out refusing to consider if aerosol transmission is important, which leaves people unprotected. So we feel it’s our duty to communicate directly with the public.
Zeynep Tufekci says that we are paying too much attention to the R value of SARS-CoV-2 (basically the measure of its contagiousness) and not nearly enough attention to the k value (“whether a virus spreads in a steady manner or in big bursts, whereby one person infects many, all at once”).
There are COVID-19 incidents in which a single person likely infected 80 percent or more of the people in the room in just a few hours. But, at other times, COVID-19 can be surprisingly much less contagious. Overdispersion and super-spreading of this virus is found inresearchacross the globe. A growing number of studies estimate that a majority of infected people may not infect a single other person. A recent paper found that in Hong Kong, which had extensive testing and contact tracing, about 19 percent of cases were responsible for 80 percent of transmission, while 69 percent of cases did not infect another person. This finding is not rare: Multiplestudies from the beginning have suggested that as few as 10 to 20 percent of infected people may be responsible for as much as 80 to 90 percent of transmission, and that many people barely transmit it.
In an overdispersed regime, identifying transmission events (someone infected someone else) is more important than identifying infected individuals. Consider an infected person and their 20 forward contacts-people they met since they got infected. Let’s say we test 10 of them with a cheap, rapid test and get our results back in an hour or two. This isn’t a great way to determine exactly who is sick out of that 10, because our test will miss some positives, but that’s fine for our purposes. If everyone is negative, we can act as if nobody is infected, because the test is pretty good at finding negatives. However, the moment we find a few transmissions, we know we may have a super-spreader event, and we can tell all 20 people to assume they are positive and to self-isolate-if there is one or two transmissions, it’s likely there’s more exactly because of the clustering behavior. Depending on age and other factors, we can test those people individually using PCR tests, which can pinpoint who is infected, or ask them all to wait it out.
Part of the problem is that dispersion and its effects aren’t all that intuitive.
Overdispersion makes it harder for us to absorb lessons from the world because it interferes with how we ordinarily think about cause and effect. For example, it means that events that result in spreading and non-spreading of the virus are asymmetric in their ability to inform us. Take the highly publicized case in Springfield, Missouri, in which two infected hairstylists, both of whom wore masks, continued to work with clients while symptomatic. It turns out that no apparent infections were found among the 139 exposed clients (67 were directly tested; the rest did not report getting sick). While there is a lot of evidence that masks are crucial in dampening transmission, that event alone wouldn’t tell us if masks work. In contrast, studying transmission, the rarer event, can be quite informative. Had those two hairstylists transmitted the virus to large numbers of people despite everyone wearing masks, it would be important evidence that, perhaps, masks aren’t useful in preventing super-spreading.
For Kurzgesagt’s latest video, they explore the challenges the world faces in attempting to get the rate of climate change under control before it’s too late and how to get there.
Climate change is just too much. There is never any good news. Only graphs that get more and more red and angry. Almost every year breaks some horrible record, from the harshest heat waves to the most rapid glacier melt. It’s endless and relentless.
We have known for decades that rapid climate change is being caused by the release of greenhouse gases. But instead of reducing them, in 2019 the world was emitting 50% more CO2 than in the year 2000. And emissions are still rising. Why is that? Why is it so hard to just stop emitting these gases?
According to the video, global population growth and economic growth will be working against us over the next few decades and that increasing our energy efficiency and lowering emissions from energy sources are the main ways in which we will be able to slow things down. It’s worth noting that on the wizard vs. prophet continuum, this video is firmly in the wizard camp. That’s not wrong or bad; it’s just that other people have different ideas about how to combat climate change.
The breadth of scale of measurable objects in the universe — our distance from the most distant objects we can observe (billions of light years away) to particles measured in something called a yoctometer (1×10-24 meters) — is staggering to think about. That’s where the Universe in a Nutshell app comes in. Developed by Kurzgesagt & Wait But Why (both kottke.org favorites), you can use the app to quickly and easily zoom in and out through objects at all the scales of the universe, like quarks, DNA, cells, earthworms, Europe, Jupiter, the black hole at the center of our galaxy, the Crab Nebula, galaxies, and galaxy superclusters.
You can tap on any object you encounter to learn more about it, like an interactive Powers of Ten. I spent 20 minutes just now playing around and it’s really fun. You can download the app for $2.99 from the App Store or on Google Play.
To mark the release, Kurzgesagt made a video comparing the sizes of stars:
And Wait But Why’s Tim Urban wrote a post about the scales of objects: The Big and the Small.
In Search of a Flat Earth is a documentary essay by Folding Ideas’ Dan Olson that starts out talking about people who believe the Earth is flat (and why it’s so difficult to convince them otherwise) but then takes a sharp turn toward a more recent and much more worrying conspiracy theory, QAnon. Lots of interesting information and observations throughout.
The astronomers, who reported the finding on Monday in a pair of papers, have not collected specimens of Venusian microbes, nor have they snapped any pictures of them. But with powerful telescopes, they have detected a chemical — phosphine — in the thick Venus atmosphere. After much analysis, the scientists assert that something now alive is the only explanation for the chemical’s source.
Some researchers question this hypothesis, and they suggest instead that the gas could result from unexplained atmospheric or geologic processes on a planet that remains mysterious. But the finding will also encourage some planetary scientists to ask whether humanity has overlooked a planet that may have once been more Earthlike than any other world in our solar system.
“This is an astonishing and ‘out of the blue’ finding,” said Sara Seager, a planetary scientist at the Massachusetts Institute of Technology and an author of the papers (one published in Nature Astronomy and another submitted to the journal Astrobiology). “It will definitely fuel more research into the possibilities for life in Venus’s atmosphere.”
Research biologist Adrian Smith, who specializes in insects, recently filmed a number of different types of flying insects taking off and flying away at 3200 frames/sec. Before watching, I figured I’d find this interesting — flying and slow motion together? sign me up! — but this video was straight-up mesmerizing with just the right amount of informative narration from Smith. There’s such an amazing diversity in wing shape and flight styles among even this small group of insects; I had to keep rewinding it to watch for details that I’d missed. Also, don’t miss the fishfly breaking the fourth wall by looking right at the camera while taking off at 6:07. I see you, my dude.
A pair of researchers from the University of Bristol have formed a company called Arkenlight to try to make diamond batteries out of nuclear waste that can potentially power devices for thousands of years. The betavoltaic batteries work by releasing beta radiation, which excites semiconductor material to produce electricity. These types of batteries don’t put out much power — they can’t replace your iPhone battery for example — but they do their thing for a loooong time.
Arkenlight is focused on creating batteries that have a diamond-like structure out of irradiated graphite, which is quite common.
But that’s where a radioactive isotope called carbon-14 may be able to help. Best known for its role in radiocarbon dating, which allows archaeologists to estimate the age of ancient artifacts, it can provide a boost to nuclear batteries because it can function both as a radioactive source and a semiconductor. It also has a half-life of 5,700 years, which means a carbon-14 nuclear battery could, in principle, power an electronic device for longer than humans have had written language.
I mean, it’s little more than a theory at this point so maybe it won’t be feasible after all, but what a brilliant idea: combining the radioactive source and the semiconductor (thereby upping the efficiency) and using nuclear waste to build the whole thing. Science at its most poetically useful. (via geoff manaugh)
Ammonite is an upcoming romantic drama from director Francis Lee. It takes place in the 1840s and stars Kate Winslet as a palaeontologist & Saoirse Ronan as her assistant; the pair clash then fall in love. The story is based on the life of Mary Anning, who made several important contributions to paleontology.
Paleontology wouldn’t be the same without Mary Anning. She scoured the dreary coast of southern England for secrets not seen since the Jurassic, fueling the nascent 19th-century field of fossil studies with evidence of strange sea dragons, flying reptiles and other fascinating fragments of life long past. And now, over 170 years after her death, she’s got her own movie.
However, there’s no evidence that Anning and her friend, Charlotte Murchison, ever had a romantic relationship.
I have to wonder what Anning would say to this. As she wrote in a letter, “The world has used me so unkindly, I fear it has made me suspicious of everyone.” In the sexist, male-dominated world of 19th-century science, Anning’s finds were celebrated while she herself was barred from joining academic societies or even finding a path to gain equal footing with the likes of William Buckland, Gideon Mantell and other traditional heroes of paleontology who parasitized her labor. Now, in having her life’s story made a fiction, is the world using Anning again?
Ammonite opens in US theaters in November? (I mean, they reopened schools in Florida against all expert advice and common sense, so why not theaters?) Anyway, looking forward to the third movie in the Portrait of a Lady on Fire trilogy next year.
Chemist Jose-Luis Jimenez writing for Time magazine: COVID-19 Is Transmitted Through Aerosols. We Have Enough Evidence, Now It Is Time to Act. In it, he argues that while much of the early attention has been on fomites (surface contamination) and droplets as pathways for spreading Covid-19, tranmission by aerosols may be more significant. His analogy of smoke makes it quite easy to understand:
When it comes to COVID-19, the evidence overwhelmingly supports aerosol transmission, and there are no strong arguments against it. For example, contact tracing has found that much COVID-19 transmission occurs in close proximity, but that many people who share the same home with an infected person do not get the disease. To understand why, it is useful to use cigarette or vaping smoke (which is also an aerosol) as an analog. Imagine sharing a home with a smoker: if you stood close to the smoker while talking, you would inhale a great deal of smoke. Replace the smoke with virus-containing aerosols, which behave very similarly, and the impact is similar: the closer you are to someone releasing virus-carrying aerosols, the more likely you are to breathe in larger amounts of virus. We know from detailed, rigorous studies that when individuals talk in close proximity, aerosols dominate transmission and droplets are nearly negligible.
Thinking of smoke can help guide our actions:
The visual analogy of smoke can help guide our risk assessment and risk reduction strategies. One just has to imagine that others they encounter are all smoking, and the goal is to breathe as little smoke as possible. But COVID-19 is not very contagious under most situations, unlike, for example, measles: the CDC says that 15 minutes of close proximity to a COVID-19 infected person often leads to contagion, which provides an estimate of how much “exhaled smoke” one may need to inhale for infection. Inhaling a little whiff of “smoke” here and there is OK, but a lot of “smoke” for a sustained period of time and without a mask is risky. (To be clear, actual smoke does not increase the probability of infection.)
In thinking about aerosolized Covid, Jimenez recommends avoiding crowds & indoor spaces and cutting down on proximity & duration, among other things.
We should continue doing what has already been recommended: wash hands, keep six feet apart, and so on. But that is not enough. A new, consistent and logical set of recommendations must emerge to reduce aerosol transmission. I propose the following: Avoid Crowding, Indoors, low Ventilation, Close proximity, long Duration, Unmasked, Talking/singing/Yelling (“A CIViC DUTY”). These are the important factors in mathematical models of aerosol transmission, and can also be simply understood as factors that impact how much “smoke” we would inhale.
But what about masks? N95s can block most aerosols but cloth masks have “huge” holes in them relative to aerosol particles, right? They still work in lowering risk (but not eliminating it!) because your “smoke” doesn’t travel as far when you’re wearing a mask and it filters incoming smoke (if your mask fits correctly and you’re keeping your distance).
Second, masks are essential, even when we are able to maintain social distance. We should also pay attention to fitting masks snugly, as they are not just a parapet against ballistic droplets, but also a means to prevent “smoke” from leaking in through gaps. We should not remove masks to talk, nor allow someone who is not wearing a mask to talk to us, because we exhale aerosols 10 times as much when talking compared to breathing. Everyone should be careful to not stand behind someone with a poorly fitting mask, as the curvature of an ill-fitting mask can cause aerosols to travel behind the person wearing it.
Great article, full of common sense advice backed up by science.
British Mineralogy and Exotic Mineralogy comprise 718 illustrations by James Sowerby in an effort to illustrate the topographical mineralogy of Great Britain and minerals not then known to it. Sowerby’s plates are some of the finest examples of hand-drawn mineral illustrations ever created. The detail and care with which these illustrations were created is incredible and worthy of close examination. See the samples below.
A new study on masks that measures the number of droplets emerging from the mouth during speech shows that properly fitted N95, surgical, and polypropylene masks are best, layered cotton masks are good, bandanas are not great, and neck gaiters may be worse than wearing no mask. Here’s a Washington Post article about the study.
I have some issues with this study — most masks were tested by only one speaker and mask materials were not identified precisely1 — but when combined with other studies about masks, it is clear that surgical masks or masks that are made with similar materials (polypropylene non-woven fabric) are what you want to shoot for, you want multiple layers for more protection (no single-layer microfiber gaiters), homemade cotton masks are pretty good (but would be better with a layer of polypropylene non-woven fabric), proper fit matters, and for god’s sake, stop wearing a bandana as a mask. Yes, bandanas are convenient, but you’re probably trading safety for that convenience, especially if you factor in the amount of time you’ll be wearing a mask over the next several months. A proper mask is going to protect you and your neighbors much more over the long haul — it’s just common sense at this point.
Re: the tested neck gaiter being worse than wearing no mask: the hypothesis is that the gaiter’s material splits large droplets into smaller ones, hence the higher count.
We noticed that speaking through some masks (particularly the neck fleece) seemed to disperse the largest droplets into a multitude of smaller droplets (see Supplementary Fig. S5), which explains the apparent increase in droplet count relative to no mask in that case. Considering that smaller particles are airborne longer than large droplets (larger droplets sink faster), the use of such a mask might be counterproductive.
Here’s what I’m taking away from this and other mask studies: wear the highest quality mask you can locate (multi-layered, incorporating surgical mask materials) that fits properly and, secondarily, is comfortable & convenient. For me, that’s a two-layer cotton mask (like these Vida masks) with an inserted layer of polypropylene non-woven fabric. An N95 would be much better in terms of efficacy, but it’s overkill in most situations (particularly here in VT, where rates continue to be low) and is difficult to fit properly and quickly. (via @EricTopol)
The purpose of the research was to establish that the testing method worked in principle-not to come up with meaningful or accurate verdicts about particular masks.
But she also concludes (correctly, in my mind):
Should you think twice about wearing just a gaiter inside, in close proximity to other people? Yeah, a fitted mask is probably better. But you didn’t need this study to tell you that.
Update: But interesting to note that in this test, scarves, bandanas, and microfiber neck gaiters came in last.
What is a “gaiter type neck fleece” made out of exactly? If you look at the photo, it doesn’t look like fleece so much as microfiber polyester, which is what my kids wear for skiing. This article says the neck gaiter was “made of polyester mixed with a little spandex”, which is definitely not fleece. My guess is they tested a one-layer microfiber gaiter and that higher quality gaiters would perform better (but still not as well as a surgical mask).↩
Ferguson zeros in on the divide between two different ways people make sense of a complex, chaotic, and uncertain world: evidence seeking and magical thinking. All of us employ both of these techniques to help ease our anxiety about the world, but those who tend towards magical thinking arrive at explanations that are based primarily on instinct, emotion, feelings, and gut reaction while evidence seekers mostly rely on scientific and empirical reasoning.
He also identifies six main aspects of magical thinking:
1. Obsession with symbols and codes (e.g. pizza as a “deep state” code for child trafficking)
2. Dot connecting (e.g. linking 5G with Covid-19)
3. Behind every event is a plan concocted by a person (e.g. Soros and the “deep state” conspiracy)
4. Purity (e.g. the Satanic panic and heavy metal music)
5. Apocalypse is nigh (e.g. the “deep state” again)
6. Preoccupation with good and evil (e.g. liberals are not only wrong but evil)
For me, the key quote about magical thinking is this one for late in the video: “These are not systems of knowledge, and they cannot build solutions. They can only criticize and second-guess.”
I Am a Scientist is an effort to introduce children to scientists outside of the narrow stereotypes that our culture typically offers (old, male, white, nerdy). They’re doing this through “scientist-of-the-month toolkits” that tell stories about contemporary working scientists who embody an “incredible range of personalities, interests, backgrounds, and pursuits”. From a blog post about the program:
Science has been the driving force in the modernization of the world as we know it, yet science as an industry has failed to adequately diversify with the times. While the new digital age offers opportunities to expand interest in and appeal of STEM careers, many barriers still hinder equitable access for all students. Conversations of famous scientists often draw answers such as “Albert Einstein” and “Bill Nye the Science Guy”. While accurate references of scientific leaders, the lack of diversity in the public image of scientists can contribute to the lack of diversity in STEM fields.
Introducing the “I Am A Scientist” initiative, which provides opportunities for students, specifically those in Junior High School and High School, to interact with the science and stories of today’s scientists-breaking down barriers like race, gender, and personal interests.
The program’s collection of classroom toolkits provide real-life stories of modern scientists, classroom resources, posters, career resources, and more. The initiative aims to help students engage with scientists that may look, act, or think like them, and are making great strides in remarkable fields that are often left out of career planning discussions. With featured scientists that range from multidimensional graduate students to globally recognized innovators at the top of their field, “I Am A Scientist” tunes into the power that comes from discovering a wide range of role models.
Stay Connected