David Elfstrom

#Caturday catbird pose

Front view of Tabby cat with dilated pupils perched like a bird on an interlocking foam floor mat

10:48 AM - Dec 02, 2023

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Stunning cover design by Beverley McDonald, UNEP.
Report available from: https://www.unep.org/resou...

Cover of the report: Emissions Gap Report 2023: Broken Record – Temperatures hit new highs, yet world fails to cut emissions (again). By: UN environment program
Deep blue background with bright coloured concentric circles. The inner circles are smooth and cool colours while the outer circles are bumpy and hotter colours. A record player needle head over top suggests this is an overhead view of a turntable and the circles are the grooves in an album as well as being temperature records.

05:00 PM - Nov 20, 2023 (Edited)

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Happy #Caturday to this weird little guy who accidentally shut himself in the bathroom when pulling the snake-like belt off the bathrobe hanging on the back of the door

Tabby cat sitting on a bathroom floor with the belt from a bathrobe in his mouth

09:59 AM - Oct 21, 2023

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Is it time to replace that expensive HEPA filter, or is it almost as good as new? How much clean air does it provide? Does it match manufacturer's claims? Made your own? Here's how to test the CADR (Clean Air Delivery Rate)

itsairborne.com

How to measure CADR of a HEPA air cleaner | It’s Airborne

How to measure the CADR Clean Air Delivery Rate of a HEPA air cleaner or Corsi-Rosenthal box using a PM2.5 meter and nebulizer DIY

08:54 PM - Sep 14, 2023

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#VentilationInequity :
Left is science classroom, steady state CO2, ventilation above requirement.
Right is typical classroom, well below minimum outdoor air requirement.
#COVIDCO2

CO2 school trace. Left: below 800 ppm. Right: 1700-1800 ppm CO2. There is a sharp change between the classrooms, illustrating moving the meter between locations.

03:52 PM - Sep 06, 2023

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09:44 AM - Aug 19, 2023

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Manufacturing one bag of cement adds over 700 bags volume of infrared heat absorbing CO2 gas to the atmosphere. Picture that.

R Subramanian (he/him) @subu.bsky.social
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24m
Why is a lawyer with a wealth tax case before SCOTUS (that WSJ is very interested in) interviewing a key Justice for the WSJ - which is basically functioning as said Justice's PR firm?
Read this @chrisgeidner.bsky.social piece to learn more.
larkenciel @larkenciel.bsky.social
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35m
Reply to Roxi Horror 💀🌸
Thank you! It's reassuring to know I'm not being silly.
Roxi Horror 💀🌸 @roxiqt.com
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30m
you are definitely not being silly
David Moscrop @davidmoscrop.bsky.social
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31m
A year ago today: a book battle for the ages: me versus the Communist Manifesto. On…Amazon.
Roxi Horror 💀🌸 @roxiqt.com
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3h
Not goblin mode and not a manic pixie dream girl but a third more elusive thing (manic pixie dream goblin)
Mir i am (Drew neminisis arc) @miriamm.bsky.social
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10h
Unprecedented is becoming precedented and we're becoming desensitized. The world is on fire.
Ben MacLeod 馬志斌 @benmacleod.bsky.social
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10h
New piece from PoPNS: "[Our leaders] should take ...

11:19 PM - Aug 04, 2023

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The MEC I know died three years ago at the age of 49

09:10 PM - Aug 02, 2023

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Tabby cat on windowsill with green eyes matching basil plant leaves #Caturday

06:29 PM - Jul 29, 2023

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Most of the gasoline you buy ends up as waste heat, not useful motion. Not so for electric vehicles.

Sankey diagrams showing how only 20% of gasoline ends up being used for driving motion while for an electric vehicle it's 89%

07:41 PM - Jul 28, 2023

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Twitter ➡️ X
is going to top New Coke (1985) and Tropicana repackaging (2009) for worst move ever

08:24 PM - Jul 23, 2023

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3 Threaded Spouts

ASHRAE Standard 241-2023, Control of Infectious Aerosols, is now available to the public to read online for free at https://www.ashrae.org/tec... (Have to follow the link from the landing page, not directly link to it)

12:57 PM - Jul 19, 2023

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I knew about the self-repairing properties of lime research published earlier this year goes into the specifics of Roman concrete. Very interesting!

sciencealert.com

We Finally Know Why Ancient Roman Concrete Stood The Test of Time : ScienceAlert

The ancient Romans were master builders and engineers, perhaps most famously represented by the still-functional aqueducts.

06:22 PM - Jul 17, 2023

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Notice how one school district can have a so-called problem of filter pressure drop, while a neighboring district doesn't. Article includes HVAC interventions likely to succeed. Link: https://forum.effectivealt...

During the early phases of the Covid-19 pandemic, public health officials asked school managers across the country to upgrade their central ducted HVAC system filters to MERV 13 and set the fans to continuous circulation. However, a sizable number of building managers reported that these systems, “couldn’t handle the pressure of a filter upgrade.” This statement was largely taken at face value by public health officials and parents, despite the great majority of cases being 1) corroborating information via equipment manuals not being provided in any case I’m aware of, and 2) not based on (total external static) pressure (TESP) readings taken from equipment in any case I’m aware of. In the vast majority cases the people making this claim didn’t even possess the tools or knowledge to measure TESP. In evaluating this claim in person and remotely several times, I have yet to find a claim backed by data, suggesting the default position should be that the claim is false.

10:49 PM - Jul 04, 2023

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My jaw dropped multiple times while reading this. https://lloydalter.substac...

lloydalter.substack.com

The Canadian connections and parallels to the UK drinking water crisis

This is what happens when you privatize, cut “red tape” and eliminate oversight: things cost more and don’t work as well, and sometimes people die.

11:26 AM - Jul 03, 2023

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Charging up for a #Caturday night

Tabby cat sitting on a pillow on the floor with an iPad charger and cable. Text on the wall is CHARGING STATION

05:52 PM - Jul 01, 2023

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James Gamble

@jamesgamble

Science Fact: It's impossible for a man to strap down any kind of load in a trailer without saying "that's not going anywhere" as he tightens the rope.

11:23 AM - Jun 17, 2023

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Until I emailed them yesterday, the Ontario Ministry of Environment had long-standing anti-mask messaging going back to at least 2015 if not earlier (Liberal government). Kudos to them for the very rapid turnaround correction. http://www.airqualityontar...

"AQHI Categories and Health Messages" from Ontario Ministry of Environment
August 2015 (or earlier) to June 7, 2023
Heading: Wearing a mask is not the best way to protect your health during a smoke event.
In general, wearing a mask is not the best way to protect your health during a smoke event. In fact, masks may lead to a false sense of security, which may encourage increased physical activity and time spent outdoors, meaning increased exposure to smoke. Masks can also make breathing more difficult.
June 8, 2023:
Heading: Wear a well-fitted respirator type mask if you must spend time outdoors.
If you must spend time outdoors, a well-fitted respirator type mask (such as a NIOSH certified N95 or equivalent respirator) that does not allow air to pass through small openings between the mask and face, can help reduce your exposure to the fine particles in smoke. These fine particles generally pose the greatest risk to health. However, respirators do not reduce exposure to the gases in wil...

09:27 PM - Jun 08, 2023

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Expert flabbergasted at people continuing outdoor activities, breathing in wildfire smoke, says warnings aren't conveyed to or understood enough by the public.

https://www.cbc.ca/news/ca...

09:22 AM - May 20, 2023

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Dr. Lucky Tran

@luckytran

Scientists: #COVID -19 is continuing to kill and cause illness for millions of people

Politicians: *Declare public health emergencies over*

Also scientists: #climatechange change will kill and cause illness for millions of people

Politicians: *Continue burning fossil fuels*

04:01 PM - May 05, 2023

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Craig Baird

@cdnhistoryehx

Today in 1873, shipwreck survivors are rescued off an ice floe near the coast of Newfoundland. The survivors had drifted on an ice floe for six months & 2,900 kms.
The ship survivors were kept alive by two Inuit named Ipirvik and Taqulittuq

Learn more 👇
https://canadaehx.com/2022...

canadaehx.com

Ipirvik and Taqulittuq – Canadian History Ehx

https://pdst.fm/e/chtbl.com/track/745E89/traffic.megaphone.fm/CORU8248369435.mp3 For six months, a group of expedition survivors had drifted on Arctic ice floes. The long, cold, polar nights had begun to take their toll. They were weak, hungry and close to despair. They had not seen another living s..

09:09 AM - Apr 30, 2023

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Justified outraged swearing in this 1-hour discussion about the preposterous removal of protections in hospitals https://soundcloud.com/dea...

soundcloud.com

Stream Masking in Healthcare (04/20/23) by Death Panel | Listen online for free on SoundCloud

Stream Masking in Healthcare (04/20/23) by Death Panel on desktop and mobile. Play over 320 million tracks for free on SoundCloud.

08:20 PM - Apr 24, 2023

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1) Since 2005, Canada is oversize increase in #HFCs (135%) compared to US (65%) & EU (33% and decreasing)
2) Leaks from A/C & refrig are 70%, blowing agents are 30%
Important for this powerful #climate GHG

nationalobserver.com

A deep dive into HFCs, one of Canada’s fastest-growing climate problems | Canada's National Observer: News & Analysis

One of Canada's fastest-growing sources of emissions is the extreme greenhouse gas leaking from our businesses and homes. Barry Saxifrage takes us on a chart-packed tour of one of our least-known climate threats.

08:15 PM - Apr 24, 2023

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#Caturday warmth
Description: Three-second thermal video of a tabby cat on the top of a cat tree. The cat blinks. Fused with visual image for definition. Hottest spot is near the eye, 35.3 C.

08:39 PM - Apr 22, 2023

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Removal of universal masking in hospitals should only be done after demonstrated near-elimination of hospital acquired respiratory infections #IPAC #HAI

07:36 PM - Apr 18, 2023

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A great 12-minute interview on air quality issues in schools, misinformation coming from school districts, and solutions.
#IAQ #covidisairborne #COVIDCO2
https://www.cbc.ca/listen/...

cbc.ca

Air quality expert grades the recent results from testing of New Brunswick's schools | Information Morning - Moncton with Jonna Brewer | Live Radio | CBC L..

Joey Fox is an engineer and chair of the Ontario Society of Professional Engineers air quality advisory group.

06:04 PM - Apr 18, 2023

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Dr. Lucky Tran

@luckytran

We have now reached the absurdist phase of #COVID denial where hospitals are literally asking patients to stay home when they are sick because they just can't be bothered to require masks anymore.

McMaster Children's Hospital
Beginning Wednesday, masks will be encouraged but no longer required to be worn by patients and visitors at our and all other @HamHealthSci and @stjoeshamiltonhospitals. We still ask that you stay home if you’re feeling unwell.
[Picture of blue surgical masks]

11:22 PM - Apr 17, 2023

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Brian Hill

@laughingmind