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Higher does not necessarily mean better. Higher grade filters filter more in each pass, but can overall provide worse performance as the air flow rate goes down. The air is being recirculated in a portable unit or in a standard domestic ducted heating/cooling situation.


Also, turns out preventing kids from getting sick improves educational outcomes.


My dad made a similar observation, assuming the children were young. However, upon reviewing the article, I noticed it doesn’t explicitly mention the grade level. Considering younger children have weaker immune systems, this could potentially lead to fewer missed classes and improved grades. Personally, my first grader misses out on a considerable number of classes.

However, if these results were observed in grades 3 or higher, it could suggest a more substantial phenomenon. I randomly picked the third grade, but perhaps there’s a specific age after which the medical community considers a child’s immunity to be significantly enhanced.


Ventilation and air purification have a strongly theoretical basis and there have been real-world studies showing a clear benefit.

https://cleanaircrew.org/

https://www.cleanairschools.com.au/


But then, what about being protected from sickness from a young age, to end up sick all the time as an adult ? You had a better education, we can agree, but your body got weaker as a result and now you can't be as productive as an adult.

I exaggerate a bit, but I found that during covid, where the mask was mandatory in my place, I was never sick. The only few years in my life where I was actually healthy continuously for YEARS, I and my friends could not believe the impact of the mask. But then we were stuck at home, living in constant misery and stress.

Once the masks disappeared, finally we could live again, and got extremely sick the first few years... Maybe a more normal balance would have been better ? Sick a bit continuously ? I think trying to avoid sickness is like trying to swim against the current, nature just works that way.


I just keep wearing an N95. I've had maybe 3 infections in 5 years.


getting sick is bad for us. we should clean the air. i’ve been wearing n95 indoors for years, 1 cold (neg for c19) in 5 years


do younger children have weaker immune systems?


It's not that they are weaker, but that many things actually confer long term immunity. The "common cold" is actually many viruses, once you've beaten one it's not likely to get you again but it's cousins will.


Not as much as their immune systems haven't been around very long and seen as many diseases.


I was under the impression that younger kids had stronger immune systems for that reason, which is why the common wisdom is to expose your kid to as much as possible when they're young, because it's easier for them to fight it off and later rely on resistance?


I guess it's a quibble over the meaning of 'stronger', but that seems overly pedantic. Let's get data.

A good overview of the allergy situation is here: https://en.wikipedia.org/wiki/Hygiene_hypothesis

Though that article goes into more about young human immune systems too. TLDR: Yeah ... it's complicated, but the evidence seems to, just maybe, lean towards more exposure being better. So, you're right, I think?


the impression I got from the article is that it's a somewhat unsolved problem. the article mentions an "old friends" hypothesis that suggests that it's not exposure to dangerous pathogens that's important in childhood, but exposure to benevolent ones. but yeah, you're right, it's semantics really. kids have a different kind of strength. I would actually suggest it's quite analogous to brain development. kids are more adaptive and I'd argue creative, but adults are more experienced.


- Aranet4

- AirThings View Plus

- Sensiron CO2 Gadget https://www.sensirion.com/products/catalog/SCD4x-CO2-Gadget/

- Kickstarter: AirSpot https://www.kickstarter.com/projects/airspot/airspot-the-per... (uses the Sensiron sensor)


Happy user of the Airthings Wave Plus (same as View but without a display). Major feature requirement was being able to fetch the sensor values with just a Bluetooth connection.


Clear exists because the TSA have made life bad for everyone.

Economy class passengers in Australia have a better experience than Clear passengers in the USA and don't have to pay extra for it.


Clear doesn't let you skip TSA screening, it let's you skip the ID check before the screening. Clear verifies your identity instead.

You're probably thinking of TSA precheck which is a more streamlined screening you pay extra for.


Clear operates a line cutting service pretending to be identity verification. DHS can already identity proof at domestic and international checkpoints using biometrics. CBP has processed almost 500M travelers at the border using biometrics.

https://www.tsa.gov/biometrics-technology

https://www.tsa.gov/sites/default/files/tsa_biometrics_roadm...

https://www.cbp.gov/travel/biometrics/airports


The entire TSA system seems useless, a waste of money


TSA is more than just the public security line at airports.

It's responsible for all aspects of airport security including all employees, both resident and transient, inside and outside the airport.

What's really baffling is how many different ID and security badge regimes DHS is responsible for, because they areythe exclusive issuer. Each airport issues their own security ID badge (SIDA). There's no interchangeability for identical clearance levels. It's remarkably inefficient. This isn't TSAs fault. Congress is the responsible party, yet rarely does it consolidate anything.


I get TSA Precheck for free since I have Global Entry (which does have a cost).


Man, unless its dramatically improved in the last 5 years Sydney and Melbourne were around the same level as hell as LAX/SFO are. Sydney was particularly bad the 3 times I had to move through it haha. My average LAX traversal is much smoother than Sydney ever was.


Perhaps, maybe, mass infection by a virus that affects the brain and vascular system has consequences for society.


It's an interesting hypothesis but should be easy to corroborate with other data, e.g. test scores. I would assume we'd have heard of that?


If we're drawing connections between 2020 and driving behavior, the much more obvious correlation would be the massive anti-police-violence protests, the accompanying increased negative public sentiments re: police, and the police reaction that occasionally gets brought up on HN, decreased policing as retribution.


Underrated comment. Police have "quit" in more than one major city in sfbay.


Isnt it a growing opinion of American teachers that students are underprepared? probably a combination of covid and remote learning... I doubt we will see the long term effects of this any time soon.


We have. The scores have fallen significantly.


Let me get this straight: you are selling a guarantee of maximum price for a medical service?

You are selling health insurance.


The most unbelievable part of this story is that he claims to have read it out to the family.


I am currently looking for a new Team Lead. I interviewed a guy yesterday who performed well in a soft skills interview and so this was his tech interview with a senior dev and myself. He was doing OK at first. As the questions got a little more nuanced, there were these pauses. Eventually, he got flustered and asked to resume later.

We agreed to this since he said he'd been dealing with a production issue for several hours before the scheduled time (I had offered to reschedule at no detriment to him before we began but he insisted on doing it then).

The developer and I met after this first interview and discussed his answers. We both thought he was "googling" (we are older people, stuck in the past).

Later that day, back on another call with this guy, my senior dev starts typing my questions into ChatGPT and getting back essentially the answers he's giving us. I start with more nuanced questions and he's done. He just kept reiterating platitudes could not explain why he was saying them, etc.

I felt bad for him, he was trying to get a job beyond his technical knowledge. But ultimately, this was dishonest and I would have found out very quickly he was not ready for the job.

If anyone is wondering, I gave him a chance to tell me why he was pausing for so long before answering and why his answers didn't seem to directly address my questions and he just insisted he was NOT pausing (he was, for up to 30 seconds at a time). It was generally just a really disappointing experience for all of us, I would imagine.


Weird comment about masks not working for vinyl chloride. Whilst it’s true that a particulate filtering mask (N95) isn’t enough, you can definitely get some protection from an organic vapour cartridge fitted to a reusable respirator. See https://www.osha.gov/laws-regs/regulations/standardnumber/19...


I’ve had lawyer patients just giggle at the fact that I’m near the top of the income rankings in Australia. ‘Clearly doctors don’t hide their income very well!’

Patients pay less, and I get paid relatively more in Australia (less in absolute terms than the US). There are fewer middlemen clipping the ticket.


More in private, but not the difference on an hourly basis is not necessarily that much.


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