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Masks do not work to protect anyone from SARS-CoV-2. It’s all based on sloppy science. We asked the senior author of the Bangladesh mask study to defend his study. He failed. Badly. Very badly.

Yale SOM-Led Mask-Promoting Initiative in the Developing World Draws Major  Donors and Government Support | Yale School of Management

Cochrane Review editor corrupts the science

New Cochrane review

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The debate is over: Masks do NOT work
Executive summary The new Cochrane Review on Masks proves beyond doubt that the misinformation spreaders were right and the ENTIRE mainstream medical community is now discredited (except for UCSF Professor Vinay Prasad who spoke out about masks…
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JAMA study in 2019 showed surgical masks were slightly better than N95 masks!

If the study was bigger, the result would have been statistically significant.

But of course that’s impossible since N95 masks have to work better.

So any benefit on lower infections was TOO SMALL TO MEASURE for either mask type, i.e., NEITHER MASK PROVIDED ANY BENEFIT.

Note: They should have added unmasked doctors to the study.


This 2019 study published in JAMA showed surgical masks worked better than N95!!! But we know that surgical masks do nothing because they are too big to filter out a virus. So N95s do nothing since they are worse. If N95 is the null hypothesis, the medical mask intervention had OR=.86 with 95% CI of .7 to 1.07 (p=.18). In short, the study was too small to conclude that medical masks are better, but it was clearly looking that way. This means masking to reduce virus spread is a complete joke. It’s poppycock that surgical masks can stop a virus (watch the Bear Spray Marines video on YouTube) and N95’s are even worse.

But what it really means is that the N95 can’t stop a virus. If it could, you’d have seen a huge difference in N95 vs. surgical masks. The fact there was no difference means N95’s can’t stop a virus. There is no other rational explanation.

New evidence showing harms from wearing masks

From this tweet by Robin Monotti:

The Harm Caused by Masks A new study suggests that the excess carbon dioxide breathed in by mask-wearers can have major health consequences. While eight times the normal level of carbon dioxide is toxic, research suggests that mask-wearers (specifically those who wear masks for more than 5 minutes at a time) are breathing in 35 to 80 times normal levels.

Mask-wearers breathe in greater amounts of air that should have been expelled from their bodies and released out into the open. “[A] significant rise in carbon dioxide occurring while wearing a mask is scientifically proven in many studies,” write the German authors. “Fresh air has around 0.04% CO2,” they observe, while chronic exposure at CO2 levels of 0.3 percent is “toxic.” How much CO2 do mask-wearers breathe in? The authors write that “masks bear a possible chronic exposure to low level carbon dioxide of 1.41–3.2% CO2 of the inhaled air in reliable human experiments.

What can breathing too much carbon dioxide do to you? The authors write that “at levels between 0.05% and 0.5% CO2,” one might experience an “increased heart rate, increased blood pressure and overall increased circulation with the symptoms of headache, fatigue, difficulty concentrating, dizziness, rhinitis, and dry cough.” Rates above 0.5 percent can lead to “reduced cognitive performance, impaired decision-making and reduced speed of cognitive solutions.” Beyond 1 percent, “the harmful effects include respiratory acidosis, metabolic stress, increased blood flow and decreased exercise tolerance.” Again, mask-wearers are likely breathing in CO2 levels between 1.4 percent and 3.2 percent—well above any of these thresholds. What’s more, “Testes metabolism and cell respiration have been shown to be inhibited increasingly by rising levels of CO2.

So, high blood pressure, reduced thinking ability, respiratory problems, and reproductive concerns are among the many possible results of effectively poisoning oneself by breathing in too much carbon dioxide.

The authors write that “it is clear that carbon dioxide rebreathing, especially when using N95 masks, is above the 0.8% CO2 limit set by the US Navy to reduce the risk of stillbirths and birth defects on submarines with female personnel who may be pregnant.” In other words, mandates have forced pregnant women to wear masks resulting in levels of CO2 inhalation that would be prohibited if they were serving on a Navy submarine.

Indeed, according to the authors, there exists “circumstantial evidence that popular mask use may be related to current observations of a significant rise of 28% to 33% in stillbirths worldwide and a reduced verbal, motor, and overall cognitive performance of two full standard deviations in scores in children born during the pandemic.”

They cite recent data from Australia, which “shows that lockdown restrictions and other measures (including masks that have been mandatory in Australia), in the absence of high rates of COVID-19 disease, were associated with a significant increase in stillborn births.” Meantime, “no increased risk of stillbirths was observed in Sweden,” which famously defied the public-health cabal and went its own way in setting Covid policies.”

Consider asbestos… bigger than the virus and N95 masks are NOT recommended

Asbestos (which ranges from 100nm-10,000 nm) is larger than the virus (70 to 90nm).

See this guidance or this guidance from the Asbestos Institute for worker protection:

They recommend a minimum P100 respirators or better. The professionals I speak with all recommend a PAPR as the minimum viable solution because masks leak.

Cal/OSHA agrees with this: N95 cannot be used for asbestos. Because the virus is smaller than asbestos, it follows that N95 masks are ineffective.

Experts I talk to say nobody uses an N95 if they are working with asbestos.

Related articles on masks

  1. Masks: evidence not compelling (published in Annals)
  2. Masks were never intended for source control. There is no ASTM means to even measure this:
  3. I offered people $10,000 to take off their face masks for 60 minutes. Here’s what happened.
  4. Particle size is <300nm (i.e., .3 microns) for >90% of the emissions from a person. Emissions are maximized when a person is infected. See Aerosol measurement identifies SARS-CoV 2 PCR positive adults compared with healthy controls. So people who argue that the virus is riding on droplets are mistaken. This is why masks can’t work.
  5. Would you take off your mask for $100,000?” This tweet got 32M views! The point was to show just how strong the programming is. Science says this is a useless intervention which is harmful to health, yet people who wear masks have been brainwashed into thinking that their life is at risk if they remove their mask. Yet they do so to eat or drink without issue. So for food, they remove their mask for free. But if you pay them to remove their mask, they refuse.
  6. Physio-metabolic and clinical consequences of wearing face masks—Systematic review with meta-analysis and comprehensive evaluation shows masks are harmful to health.
  7. The debate is over: Masks do NOT work: Talks about the Cochrane Review finding no evidence that they work. The press then claimed the Cochrane Review was “misinterpreted” and said that the interventions failed due to compliance reasons, but masks themselves work if an individual uses them as directed. There is simply no evidence for this; they haven’t been able to replicate the protection numbers in any trial anywhere. You need to watch the bear spray video to see this in action.
  8. Re-analysis on the statistical sampling biases of a mask promotion trial in Bangladesh: a statistical replication. Ben Recht’s analysis finally published in a peer-reviewed journal showing the flaws of the Bangladesh study.
  9. Unmask your child: a great resource for parents on why you should not mask your child
  10. Carbon dioxide rises beyond acceptable safety levels in children under nose and mouth covering: Results of an experimental measurement study in healthy children
  11. Snoqualmie Valley Marines Testing Masks with Bear Spray: A visual demo; bear spray particles are 10X larger than the SARS-CoV-2 virus and the masks are completely and instantly ineffective in blocking bear spray. Are you feeling lucky?
  12. Even more proof: Masks don’t work which talks about a third randomized trial comparing surgical and N95 masks in a hospital setting and showed N95 are just 14% better. 14% better than 0 is still zero.
  13. Meghan Mansell tweet on eye transmission. Her new article on eye transmission notes that face masks are designed to protect the wearer. No face mask is designed for source control. So mandating their use is nonsensical!
  14. Tweet on eye transmission with diagram: “Any virus will bypass even the best facemasks through the nasolacrimal duct (also called the tear duct).”
  15. If you don’t believe my experts on eye transmission, do you believe Fauci? He was actually telling the truth sometimes
  16. Foegen effect: masks make things worse
  17. Mask Recommendations in the UK and US: shows how flawed they are
  18. Masks don’t work
  19. Do masks work?
  20. N95 vs surgical masks in Germany vs. Bavaria
  21. California just re-instituted the mask policy indoors
  22. Highly acclaimed peer-reviewed Bangladesh study shows that masks don’t work at all
  23. My letter to the editor on mask wearing.
  24. We’ve asked Science to retract the Bangladesh mask study
  25. The Bangladesh Mask Study provides no evidence that masks reduce Covid-19 infection
  26. We’ve asked that the Bangladesh mask study either be corrected or withdrawn
  27. Mask alternatives
  28. How to protect Grandma from COVID
  29. Evidence from the CDC and IDSA that masks work (there is no evidence)
  30. Masking Kids 10-12: A New Natural Experiment From Finland. Did it work?
  31. The remarkably surprising results of ending mask mandates
  32. Revisiting Pediatric COVID-19 Cases in Counties With and Without School Mask Requirements—United States, July 1—October 20 2021 shows that the CDC study showing masks worked was wrong because they cherry picked data. When you don’t do that, masks don’t work.
  33. 10 talking points on masks for school board meetings (highly effective)
  34. Bacterial and fungal isolation from face masks under the COVID-19 pandemic
  35. Pathogenic Bacteria and Fungi Found on Masks: Study
  36. New systematic review claims masks work. No way.
  37. Revisiting the Bangladesh Mask RCT: Ben Recht was the first one to call out the flaws in the Bangladesh study publicly
  38. Famed Bangladesh Mask Study Excluded Crucial Data
  39. More than 150 Comparative Studies and Articles on Mask Ineffectiveness and Harms

CO2 levels

  1. Masking the downside (El Gato Malo article talking about harms)
  2. Inhaled CO2 concentration while wearing face masks: a pilot study using capnography (referenced by the El Gato Malo article)
  3. Experimental Assessment of Carbon Dioxide Content in Inhaled Air With or Without Face Masks in Healthy Children (it’s retracted but I know the authors. Compare the result with the paper above and see who you believe)
  4. A recent and prior two studies that show facial COVID masks (surgical) are very toxic and dangerous and I warn parents again, these masks do NOT work, ineffective, and are very dangerous to your child
  5. EPISODE 268: W.H.O. IS IN CHARGE? (watch at 9:58)


A careful analysis of the Bangladesh mask study by British mathematician Norman Fenton showed that the study was roughly equivalent (in terms of statistical uncertainty) to flipping 34 coins, noticing that 18 landed on heads and 16 landed on tails and concluding that coins are more likely to land on heads when flipped. In other words, the Bangladesh mask study proved nothing.

As I write this on April 13, the CDC just decided to continue the transportation mask mandate for another two weeks. Dr. Bob Wachter, Chair of the Department of Medicine at UCSF, concurs with the CDC decision. This doesn’t prove that masks work. Instead, it proves that the CDC, Wachter, and most mainstream scientists (who claim masks work) are incapable of differentiating solid science from a sloppy study.

There have been only two randomized trials to test whether public policy using masks to mitigate the spread of SARS-CoV-2 can reduce the spread.

The first one, in Denmark, failed to show that masks made a difference. However, they were forced to re-write their paper to claim masks worked in order to get their study published. This is known as “scientific corruption to match the political narrative.” The BMJ story points to stories such as this one where the journals all refused to publish the study because it determined masks don’t work.

But the second one, in Bangladesh, claimed that masks worked.

Nature called it a “rigorous study” and Stanford and Yale promoted it as definitive in a press release.

But was it really? We don’t think so for three reasons:

  1. Mechanism of action: Masks can’t work
  2. History: Never before in history have masks reduced virus transmission
  3. Lack of statistical power due to cluster randomization and failure to adjust for biases and confounders: Our analysis by multiple independent people found serious flaws in the study which showed that the effect was so small as to be unmeasurable (less than the noise from biases and confounders). In fact, one of our reviewer argues that, under a very reasonable assumption, the study could be interpreted as finding masks increase your risk of being infected (but not statistically significant).
  4. Other studies show no effect to negative effects: The Denmark study showed no effect. More importantly, the latest mask study in Finland which is arguably the fairest tests of masks to date since the groups were very well matched, showed that if there is an effect, it would likely be that masks make things worse. This was not our professional opinion, but from a highly respected mainstream doctor UCSF’s Vinay Prasad, who was one of the very few doctors to even read that study (since it went against the narrative, most doctors ignored it). Watch his video at 2:45 where he explains that if anything, masks make things worse.

We challenged Yale Professor Jason Abaluck, the first author of that study, to defend their study. To his credit (and our utter amazement), he agreed but with one condition: we were only allowed one person to challenge him (because that’s how science works of course). We instantly agreed.

The discussion happened on April 3, 2022. The result: Abaluck failed. Badly. Very badly. One of our experts who viewed the interview said that it was worse than just sloppy work. He wrote, “This is bordering on fraud.”

In short, the Bangladesh mask study again failed to prove that masks make a difference. It was all statistical noise.

For example, here’s the graph for purple cloth masks. If masks worked, it would be highly unlikely for these curves to be on top of each other. For some strange reason, graphs such as these were omitted from the paper. Can you guess why??? Yes, it’s because the study was designed to fit the narrative. Subgroup analysis that goes against the narrative is not shown in the paper. That would cause people to ask questions.

You can see the entire 2-hour Abaluck discussion yourself and make your own judgment. You can watch Jason contract himself multiple times and make appeals to authority.

I also include a link to my interview with statistician Mike Deskevich on his interpretation of the Abaluck discussion. In the video, Mike clearly explains why the study shows no effect and he does it in just a few charts. You don’t need to know much about statistics to see what is going on. As soon as you see the huge variation in the control groups (and the huge variation based on mask color), it’s over. This is a great video because you’ll learn how to interpret other studies like this.

Initially, Professor Abaluck was so self-confident he thought he could run circles around us. He was wrong. The truth won.

So now Abaluck has changed his tune. He now says he won’t talk to us anymore or answer any more questions.

The bottom line is this: there is no rock on Earth that is large enough for study authors to hide under. The use of masks to slow the spread of SARS-CoV-2 has been debunked.

Masks don’t work. There is a reason these studies failed to find an effect: it’s because there is no measurable effect. Our team has said this from the beginning.

In fact, even Fauci agrees masks don’t work. Watch this video starting at 29 seconds into it where he admits it might make people feel better and it might block a “droplet or two.”

Science today is not about transparency. It is about finding creative ways to adjust your study to please your funders and then to avoid being challenged by hiding from people who seek to challenge your work. This is why I can’t get a debate on vaccine safety and efficacy with any of the members of the FDA or CDC committees, for example.

This interview with Abaluck shows that when we do get a chance to challenge mainstream beliefs, we win. So far, we’ve only been given a single “at bat” opportunity. We are now 1-0.

So now you know why we can’t find any authority who wants to debate our team on any of our points: they know they will lose. So they make up excuses to avoid being challenged like that we are misinformed, lack credentials, or that they don’t have time for such silliness as defending their study. This is also why there is such an intense focus on censoring, deplatforming, gaslighting, and discrediting us: because they don’t want their bad science to be exposed.


As any of my readers can attest, I have been trying since May 25, 2021 to get anyone from the other side to challenge me and a few of my team members to discuss whether I am spreading misinformation or the truth.

Thus far, I have been unable to get anyone to take any of my offers, even with million dollar incentives. Here are some of my offers:

  1. Who wants to be a millionaire?
  2. “Name your price” offer to qualified vaccine proponents
  3. Earn $5K if you can find someone who is willing to publicly show us how we got it wrong
  4. My “name your price” offer to the members of the FDA and CDC outside committees)
  5. Can any company or government agency justify their own COVID mask policy?

So I was overjoyed recently when I finally got a qualified person willing to challenge on a recorded video our assertion that all public mask policies deploying cloth, surgical, and N95 masks are nonsensical and not justified by science.

Finally, for the very first time, the world will get to see a discussion between the two sides on a key issue: Do masks work?

The two randomized studies on masks and SARS-CoV-2

There have only been two randomized trials testing the hypothesis that masks can reduce the spread of COVID.

The first one, in Denmark, was negative. Masks made no difference. But in order to get the study published, they had to change the science to match the narrative. This was all well documented in the BMJ, one of the few honest journals left. I note that nobody disputes this.

The second one, in Bangladesh, claimed masks are effective. It is the study that all the “experts” seized upon. “See, masks work!!”

I asked the first author, Yale Economics Professor Jason Abaluck, if he would answer a few questions we all had on the study as none of us believed it. It was cluster randomized so it didn’t have sufficient power to detect a small signal. Plus, purple cloth masks showed no effect at all, red cloth masks were the most effective, and surgical masks were in between the two. This means it’s all statistical noise.

Lots of people had issues with the Bangladesh study

El gato malo and UC Berkeley Professor Ben Recht were two of the first people to point out the flaws in the Bangladesh mask study. Then our team independently verified Recht’s work. See Masks don’t work and skip down to the section entitled, “Supporting evidence that the Bangladesh study showed masks don’t work” for all the articles analyzing the study.

In other words, it was clear to the critical thinkers in the room that there was no detectable benefit at all.

But Professor Abaluck said that we got it wrong. And to our utter amazement, he agreed to defend his study in an interactive discussion.

We could not believe it!!!!

A first author who is willing to engage our team and defend his study!?!? That has never happened before. Never! Normally these people run for the hills when we call on them. Could we have made a mistake? We thought about it for a few seconds… nah, no way.

There was one big condition: Jason would only agree to engage with us one person at a time.

To make it a “fair” exchange, we picked someone on our team (James Lyons-Weiler) who was completely unfamiliar with the study and we gave him a week to read the study and prepare.

So the discussion is between:

  1. the person in the world who is arguably the most familiar with the study (Professor Abaluck) vs.
  2. one of our guys (James) who just read the study a week ago.

The two hour discussion between Professor Jason Abaluck and JLW

Guess what happened? Yeah. Professor Abaluck lost. Big time. You can watch the 2-hour video here or if you are short on time, just read all the comments.

It got even worse. When Professor Abaluck realized he lost, he basically said, “Stop with the questions!” If this isn’t a tacit admission that his study is deeply flawed, I don’t know what is.

Professor Abaluck basically doesn’t want to talk to us anymore because we ask hard questions and point out serious flaws in his study. And we caught him contradicting himself multiple times in this short 2-hour conversation. One of our experts from the UK (a very famous math professor) viewed the video and was appalled. He wrote to me, “This is bordering on fraud.”

If anyone with any serious academic credentials thinks the Bangladesh mask study and the video discussion proves that masks work, I’d be willing to pay you $100K to show us we got it wrong (you only get the money if you can convince any of our team members on the call).

Of course, nobody will take us up on the offer because they know every person we discredit like this just makes the case for masks even worse.

So even though there is no cost to get the $100K, the risk is you lose and discredit yourself and dig a deeper hole that makes it even harder for anyone to defend the study in the future. That’s why nobody qualified to defend the study will do so even though there is no financial risk; the reputational risk is huge.

The Mike Deskevich analysis of the Abaluck interview: highly recommended

Watch my interview with Mike.

Here’s James’ Substack article on my interview with Mike: Who Won The Bangladesh Study “Debate”? You Decide

It shows very clearly with just a few charts that the study is all noise and any signal is smaller than the noise.

You don’t need to be a statistician to be able to understand this.

UK math Professor Norman Fenton on the study

Update on April 19, 2022:

I’ve been working solidly on a Bayesian analysis of the mask data and am writing it up as a report. Should be finished by Friday. The Bayesian analysis takes full account of uncertainty and shows no real evidence that treatment group has lower seropositive rate.

if we assume that there is a very small bias as follows: Whether or not a person believes they have ‘covid symptoms’ is extremely subjective when the symptoms are minor. If two people – a mask wearer and a non mask wearer – have very similar minor symptoms then intuitively it seems it is less likely that the mask wearer will report having covid symptoms (since they presumably believe wearing the mask avoids catching covid). If even 2% fewer mask wearers report having symptoms than similar non-make wearers then mask wearers are more likely to be infected (but not stat significant of course).

The reporting bias is real because the trial can’t be blinded. This is very important because they did NOT test everyone, only those who reported being sick. Therefore, they didn’t adjust for this very important bias and can’t even quantify the effect.

The Finland study didn’t have this problem at all which is why it is a better study and more likely to be closer to the truth. And it showed that, if anything, masks made things worse.

Vinay Prasad on the Bangladesh study and the op-ed

Here’s Vinay’s video on the Bangladesh study. He didn’t dive as deeply as we did into the study, but he seized on the authors deliberately misrepresenting the results of their study in an influential op-ed they wrote after the study came out.

Vinay also posted this on Twitter showing how corrupt the CDC is:

and this subtweet

Peter Yim on the Bangladesh mask study

Nice diverse insights/interviews on this masking study. One thing I would add/clarify.

The study reported outcomes for SARS-CoV-2 seroprevalence whereas the protocol called for the study of SARS-CoV-2 seroconversion.


From the registration of the study:

“This study intends to answer the following research questions: …

Can community mask-wearing reduce COVID-19 seroconversions?

Can mask wearing reduce COVID-19 seroconversions for the wearer?

Are high-quality cloth or “surgical” masks more effective in reducing COVID-19 seroconversions?”

Seroconversion is a more meaningful outcome than seroprevalence since it discounts pre-existing seropositivity. No explanation is given in the article for the change to the study.

Note to readers: Seroprevalence means you’ve had COVID sometime in the past. Seroconversion means you got COVID during the study. They promised to look for the more meaningful measure. Yet the study didn’t do this.

Masks (cloth, surgical, and N95) do not work to protect you from getting COVID.

Masks can’t possibly work.

Think about it… if masks worked, they would proudly proclaim that on the box that it can reduce your exposure to SARS-CoV-2 by xxx%. But no such claim is present on any box from any manufacturer. There is a reason for that: they don’t work.

If these masks worked, then why do all people doing asbestos work wear a PAPR unit? (asbestos is far larger than a virus)

This was very clearly explained by industrial hygienist Stephen Petty in his testimony for the New Hampshire Senate. Read the Description on the Rumble video of Petty’s testimony. It is excellent, one of the best descriptions available. Here’s an excerpt:

Face masks protect neither the wearer (self-protection) nor others (source control), because their pores are way too large to inhibit aerosols. It’s like trying to stop a mosquito with a tennis net. Also, masks leak, which further significantly reduces their already negligible protection.

Lastly, any droplets that are stopped by the mask initially will evaporate within a short period of time, because masks have no reservoir. It’s like putting an almost flat saucer under a leaking faucet. The saucer may stop water droplets initially, but will overflow very quickly.

Or consider this quote from Dr. Richard Urso:

“Masks have been looked at for three decades or so. There are twelve or so Randomized Control Trials (RCT’s). There are zero RCT’s that show masks stop the spread of respiratory disease and that’s including N95. For everyone, N stands for non-oil resistant and 95 stands for 95% airborne particles of which all viruses fit through. So, I usually tell people that wearing an N-95 has been shown through RCT’s to not be effective. But, more importantly the capsule on these viruses is an oil capsule and I tell people it’s like peeing in a pool. It goes right through and it doesn’t stick to water molecules, it’s an oil capsule virus. At the end of the day, the data is what it is. There is zero, repeat zero, RCT’s at all showing masks stop upper respiratory disease.”

If masks worked as claimed, then why do these studies on masks of various types all fail?

  1. Surgical mask vs N95 respirator for preventing influenza among health care workers: a randomized trial which showed no difference between the mask types.
  2. Use of surgical face masks to reduce the incidence of the common cold among health care workers in Japan: a randomized controlled trial which showed surgical masks made no difference in preventing colds; but they resulted in significantly more headaches!
  3. The Finland mask study in kids showed no effect. Watch this excellent Vinay Prasad video: Masking Kids 10-12: A New Natural Experiment From Finland. Did it work? Most importantly, you’ll see that kids who wore masks had higher number of infections than kids without masks (watch Vinay’s video at the 3:00 mark where you can clearly see this and he mentions it). Vinay goes on later to point out that this was probably the single best study on masks we’ve ever had. So what do we do about the study? We pretend it never happened of course since it is not consistent with the narrative. That’s how science works nowadays. How many people (who are not “misinformation spreaders”) are calling the CDC out on this? Just Vinay Prasad as far as we can tell.
  4. Unravelling the Role of the Mandatory Use of Face Covering Masks for the Control of SARS-CoV-2 in Schools: A Quasi-Experimental Study Nested in a Population-Based Cohort in Catalonia (Spain)
  5. Hundreds of studies showing masks don’t work
  6. The WHO and Fauci clearly stated surgical masks were of no significant benefit in Jan of 2020 and Fauci repeated that truth in no uncertain terms at least 4 times until the middle of April when masks became dogma. Xiao, Shiu, Gao, Wong et al published a meta analysis of 10 RCTs studying masks ability to affect transmission of respiratory viruses. There was no significant effect … period. See The paper was published in the Emerging Infectious Disease journal.
  7. The More Masks Fail, The More We Need Them shows studies in various places showing that they don’t work.
  8. And my favorite demo

Comments from James’ readers

Analysis by a statistician of the 2 hour interview

Steve asked me to do a review of the video with timestamps and comments.  Sorry it took so long to get this out, it was harder than I thought because Jason can’t stay on topic and there’s no good place to really point out things.  I have some random timestamps below with thoughts, hopefully that’s kind of helpful.  I hope my comments here don’t make me look too stupid on this thread of people much smarter than me.  Maybe I should just “trust the experts” and not “think for myself” like Jason recommends.  That’s obviously the right way to communicate science.

First – I really need to thank James for doing this!  You clearly show that you know your stuff and can speak about it.  You kept your cool with the yippiness and interrupting much better than I would have.

My big picture thoughts – The first half of the interview was Jason flip-flopping between being super precise to not look like he was p-hacking and then actually referring to sub-group analysis that was p-hacking.  The second half was nitpicking about details of p-values when the analyses they did were so wrong, it’s really not worth worrying about.

Jason reminds me of the typical fast-talking know-it-all grad student who only succeeds because he can talk fast and sound technical.  That probably is a bit because he’s not a real scientist – economics is so much squishier than physics, you can win by talking fast and using narrative rather than relying on clear experimental results.  It all looks great to the non-expert observer and he’s puffed up by all the twitter love he’s gotten, so he looks extra confident.  Unfortunately, all of the problems with his work are technical and will be over the head of most people.

Jason and weaseling about media portrayal of the story – James starts out asking Jason about what he thinks of the media overstating his conclusions.  He tries to be honest and say that the media might have been a little too positive about it, but he won’t commit.  Who wouldn’t?  He’s getting all kinds of love from the media, especially the NYT and he’s been validated as a good liberal professor.  The next hour of the conversation is Jason using technical terms to show that he followed the proper procedure “the preregistered, blah, blah blah”.  Technically, he’s correct, the only thing they said they’d look for is the “effectiveness of masks” regardless of mask type or color.  So when they say “masks work” they are correct, even though only surgical masks really worked and cloth were neutral (i.e., didn’t do anything).  Of course if you look at this twitter thread he posted, he’s much more definite in his wording because he cares about the public narrative over the science.

He keeps coming back to the generic “masks work” because that’s the metric they said they’d report on.  But of course the paper has many other analyses in it that suggest other benefits.  That’s the whole “subgroup analysis” argument that kept coming up.  The way the paper is written is reminiscent of p-hacking without p-hacking.  That is, Jason says all masks work (because that’s the preregistered…) but then calls out specifics like surgical masks work really well.  Or masks work better for old people.  Or things like that.  By mentioning them, he can tacitly build evidence that supports his position, but he still stays away from it technically.  So it’s like a good lawyer coloring the jury but staying technically legal. He keeps conflating the idea of mask working with the idea of not being inconsistent with not working. Of course he never mentions the fact that purple masks perform much more differently than other masks.  To me, the difference in performance of the same mask-type that differs only in color is a great way to see how much noise is in the system.  He skips over that.

I don’t have much more to really say about the first hour.  It was just Jason annoyingly repeating technical details but not really interpreting the science.

Then comes the imputation discussion. Others have covered that better, I’ll skip it.  But it follows the same pattern, he says “we didn’t find much of an effect with cloth masks, but if we make up data it looks better.  And then says, well we shouldn’t make up data.”  It’s just another narrative where he tries to suggest data supports his opinion and then backs off to stay away from fraud.

The last hour really is really talking about all of the subgroup analyses they did.  It’s basically p-hacking without p-hacking.  For example, he’s adamant that “all masks work” because “surgical masks work and the data is not consistent with cloth masks not working”.  And then if you factor in all of the age stratification and different types and colors of masks, there are lots of different subgroups they run to tacitly get significance. Then at the last minute he backs away to stay far enough away from a p-hacking fraud claim.  It’s all pretty sneaky.

My biggest issue is just the bad analysis.  For example, near 26:50 in the interview, he says that some of the villages had 20% mask-wearing compliance and others had 70% mask-wearing compliance. That likely doesn’t meet the homogeneity of variance needed for the stats they run.  I also know from reading the mask/unmask counts are not balanced very well, so normal t- and p- tests don’t make sense. And the fact that they’re holding on to a p=0.03 when they have N=300,000 in the study just shows that they’re trying to find a signal in the noise.  With that many people in the study, it should be clear if there’s an effect.

And of course none of my complaints about the analyses even matter when they use the wrong N.  Ben Recht already pointed out that since this is cluster-randomized, it reduces the effective sample and completely washes out any difference.  My complaint is that of the 300,000 people, they only tested about 10,000 for symptomatic seropositivity which means the variance for their t- and p- tests is much larger.  Additionally, the effect size is on the order of 1 per 1,000 people (if I remember correctly), which is well within the false-positive rate of the seropositivity tests. They incorrectly use nigh-N variance to literally find a signal in the noise. I should actually plot a power curve for this, but haven’t gotten around to it. I’m sure it would not be flattening out and showing convergence.

– mask compliance isn’t consistent between villages: no homogeneity of variance
– arms are unequal size for the simple p- tests
– cluster randomization reduces effective sample size
– they test 1/30th of the actual number of people in the study
– the effect size is on the order of the false-positive rate of the blood tests


Masks have never worked to stop a virus in history.

Tony Fauci said on March 8 that masks don’t work to stop a virus. He was correct. Did the laws of physics change since then? Was a new study published? Nope. The CDC simply decided on April 3, less than 30 days later, based on no new science, that masks worked (see details here). That’s how science works folks.

The Bangladesh study didn’t prove that masks work. The first author of the study failed to convince any knowledgeable statistician I know that the study showed masks work.

Flawed studies can make it look like masks work. But that doesn’t mean that they do.

This example shows just how critical it is for people who make claims to be open to defending their claims to challenge. This is how the world discovers truth.

All of us “misinformation spreaders” are open to being challenged by the CDC, NIH, FDA, public health officials, experts in epidemiology and infectious disease, and professors of medicine at any university in the US.

If UCSF’s Bob Wachter thinks the Bangladesh study is solid, perhaps he can defend it. Will he try? No. Not a chance.

I find it enormously troubling that not a single one of these “respected COVID authorities” are willing to challenge us on our views on masks or anything else. That is not how science is supposed to work. What are they so afraid of? Don’t they want to reveal the truth about who is right?

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