Drifting off-topic. We're talking physics here. What is the difference between outside and inside?https://twitter.com/jljcolorado/status/1473467587984044038?t=1JgwrcS45VDqwR0ng0NlWQ&s=19 …
Complex systems, wicked problems. Society, technology, science and more. @UNC professor. @NYTimes columnist. My newsletter is @insight: http://www.theinsight.org
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Prof. *Dr.* Nausheen R. Shah Retweeted Prof. Jose-Luis Jimenez
Drifting off-topic. We're talking physics here. What is the difference between outside and inside?https://twitter.com/jljcolorado/status/1473467587984044038?t=1JgwrcS45VDqwR0ng0NlWQ&s=19 …
Prof. *Dr.* Nausheen R. Shah added,
The observation is that outdoor xmission is about 20x lower than indoor. Dr. Jimenez argues that transmission indoors and out would be equally efficient in and out for droplet xmission. But time, frequency, geometry will all influence droplet xmission. Not only distance.
The *original* point was about the dominance of aerosols. Physics settles that question. I don't care what you call them, as long as people understand what you mean. Relevant: what you need to mitigate. Hence stress on N95 mask, air purification/ventilation etc.
Those arguments are a lot stronger. I agree.
And we are 100% (or nearly so) in agreement re. broadly deployed mitigations.
Ok. But again with the qualifier!! What do you not agree with?
I think we might disagree about the importance of droplet mitigations *in addition* to aerosol mitigations (some of which overlap) in congregate and clinical settings. I don't think the half-assed droplet mitigations in, e.g., supermarkets, can make any difference at all.
You mean face screens/plexiglass barriers? In clinical settings I see value in face screens. But generally plexiglass barriers are bad idea. They tend to accumulate stuff behind them (fluid dynamics). There's a bunch of CFD visuals for that, but also similar effect as snow banks
So OMG I think we're actually in
agreement here 
Which makes what Kim and the others have been saying the whole time correct. The WHO committees literally yelled at them, and a whole bunch of scientists, who had gathered to politely to point all this out. But yeah, physics is physics.
(Also note overdispersion was observed from the earliest epidemiology, so superspreading was always crucial.)
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