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226 votes
Accepted

Do facemasks cause CO2 poisoning?

This is the meter used in the video: Note that the sensor is situated at the top, pointing upward. When the person in the video breathes out, the exhaled air will be directed into the sensor, but ...
Daniel R Hicks's user avatar
84 votes

Did Wild West outlaws regularly wear face masks?

Yes, of course. This was quite common. — The Evening News, Detroit MI Michigan, July 4, 1901 'Last train robbery of Butch Cassidy & the Sundance Kid' 'Original reporting' Sundance supposedly ...
LangLаngС's user avatar
  • 44.1k
81 votes

Does wearing a face mask cause intermittent hypoxia?

This study has way too many problems to draw such a conclusion. It can only be taken as an indication that it may be worth further study, or may corroborate or contradict other, more carefully ...
Stilez's user avatar
  • 1,349
43 votes
Accepted

Did Dr. Fauci say that face masks don't work against COVID-19?

I have seen the 60 Minutes interview (March 2020: Dr. Anthony Fauci talks with Dr Jon LaPook about Covid-19) used as proof positive for this. The dialogue goes (transcribed by me. I is the interviewer ...
pinegulf's user avatar
  • 6,572
32 votes

Did Dr. Fauci say that face masks don't work against COVID-19?

There is reporting by Newsweek from June 2021 that Dr. Fauci downplayed the effectiveness of cloth masks in preventing infection in an email with a colleague from February 2020. This information does ...
Dave's user avatar
  • 2,456
24 votes

Does wearing a face mask cause intermittent hypoxia?

The study gets off on the wrong foot with the unqualified and unsubstantiated claim that Covid-19 is the world's deadliest pandemic. There is some discussion about that in the previous question Did ...
Weather Vane's user avatar
  • 7,670
24 votes

Did Wild West outlaws regularly wear face masks?

LangLаngС's answer has good examples of bandits/outlaws wearing masks in general, but the type is rarely mentioned - one image shows Zorro-style masks, and flour sack masks are also noted. Here are a ...
TylerW's user avatar
  • 341
17 votes

Do surgical masks help prevent the spread of COVID-19 from infected members of the public?

We finally have a study that examines surgical masks and their effectiveness under different viral-load situations and compares their effectiveness to other types of masks. The research provides the ...
If you do not know- just GIS's user avatar
12 votes
Accepted

Are there medical reasons for not being able to wear a surgical mask?

As the other answers don't seem to make this link too clear from experiments (or at least the comments are in that direction); there aren't a lot of those it seems, but there's one cited in a review ...
against very long user names's user avatar
10 votes

Does this article present an accurate summary of the (in)effectiveness of masks at preventing Covid-19 transmission?

While I can't address all the details in the article it's clearly being very deceptive: Covid-19 is mainly spread by microscopic aerosols generated by breathing, talking, sneezing, and coughing. The ...
Loren Pechtel's user avatar
8 votes

Does wearing a face mask cause intermittent hypoxia?

I'm not a hematologist, but I do ponder whether the statistically significant difference observed between those two groups, of 0.52 g/dl of hemoglobin (Hb) is of actual/much clinical relevance, let ...
against very long user names's user avatar
8 votes
Accepted

When the WHO/CDC/NIH recommended wearing cloth masks, did they cite any scientific paper supporting their effectiveness?

As far as the WHO is concerned, they seem to only have changed their recommendation in June (much later than the CDC). Also note that it's a red herring what AAPS says about "respiratory ...
against very long user names's user avatar
5 votes

Do surgical masks help prevent the spread of COVID-19 from infected members of the public?

First, surgical masks (especially doubled up) work fine for keeping you safe from aerosols. Cloth masks also work to some extent, but not quite as much. This has been shown in a number of studies, but ...
CJR's user avatar
  • 5,723
4 votes

Do facemasks cause CO2 poisoning?

Regarding the first issue, whether the measurement method shown in the video is sensible (as this was challenged by mods as being unsourced speculation in the accepted answer), there are actually ...
against very long user names's user avatar
4 votes

Do surgical masks help prevent the spread of COVID-19 from infected members of the public?

It would appear to be difficult to test this with a single direct experiment, but we can approximations based on aerosol transmission models. A recent paper, SARS-CoV-2 aerosol transmission in ...
JonathanReez's user avatar
  • 10.8k
3 votes

Does wearing a face mask cause intermittent hypoxia?

Looking at what other factors that cause hemoglobin concentration, I looked at smoking in particular to see how much that causes these levels to change. In doing so, I uncovered 2 major problems with ...
computercarguy's user avatar
3 votes

Are there medical reasons for not being able to wear a surgical mask?

Yes, there are several medical conditions that are directly triggered by wearing a mask. Physical problems are most commonly caused by the increased humidity (and temperature to a lesser degree) of ...
Elmy's user avatar
  • 771
1 vote

Do surgical masks help prevent the spread of COVID-19 from infected members of the public?

Note/preamble: I'm not sure why I got more DVs for this answer, but do note that I tried to answer the Q as asked namely When worn by members of the public who are infected, are surgical masks ...
against very long user names's user avatar
1 vote

When the WHO/CDC/NIH recommended wearing cloth masks, did they cite any scientific paper supporting their effectiveness?

True The CDC changed course on April 3: "The Coronavirus Crisis: CDC Now Recommends Americans Consider Wearing Cloth Face Coverings In Public", npr,org April 3, 20205:49 PM ET On that day ...
LangLаngС's user avatar
  • 44.1k

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