Jay Kusnetz 💜

@Geiger_Capital Amazon is like doing Physics while the school is like doing Biology. Physics is a lot easier than Biology. Bill Gates spent $5B over 20 years trying to improve schools and failed gemini.google.com/share/b9fcca08…

Jeff Bezos on NYC spending: "If we ran Amazon the way New York City runs their school system, packages would take 6 weeks to arrive, we would charge you a $100 delivery fee and when the package did finally arrive, it would have the wrong item in it."

@ghhughes @ParcilSafety I think (perhaps dunning krugering) a viable approach would be a 2 piece 3d printed of what needs to be silicone. 2 piece outer mold made (plaster) then tube put inside, and fill with plaster. Remove outer mold and 3d print, replace outer mold and cast. Inner mold stays as core

Casting supplies are surprisingly expensive. But with the right set of 3D printed molds, a head could be printed for less than $5,000 for sure. The NIOSH head models are in circulation somewhere, but that is just what's needed for the outer mold. A separate set of molds for the core would need to be modeled from them. Both the iBodi and the Inspec International use metal skulls, which I'm sure is a significant part of their cost. And iBodi uses the kind of anatomy you see in skeletal reconstructions to get the flesh thicknesses right. Granted, my Sheffield headform doesn't have that, but it does have at least 1/2 of silicone, likely over a fiberglass core. And it has a somewhat over engineered EN 140 : 1998 tri-axial sampling tube.

It makes me sad that this Sheffield model mask testing headform owned by respirator retailer @ParcilSafety has been on eBay **for years**with no takers. 🙁 I kept hoping there would be huge a markdown when they finally realized that they were losing money big time by neither using it nor selling it.😅🤞 I'm looking for a backup testing headform for when I finally wear out the Sheffield headform I got from a manufacturer in China. I can't imagine anyone paying $5,000 for the used Inspec International Sheffield headform when a top of the line, brand new iBodi advanced headform with anatomically correct variable depth silicone skin costs the same. (Or they did when I asked for a quote a while ago.) The Inspec International headform is coated with polyurethane to simulate skin. Urethane is subject to degradation by hydrolysis over time - if you've ever had shoe soles suddenly crumble into gooey chunks then you've experienced it. So the headform is losing value over time because it has a limited lifespan. Sigh...

@Engineer_Wong In the scenario where we are directly unmasked breathing in the airflow, like with the 4Lite, wouldn't 99.9% filtration be most important?

Recently, I've received several emails requesting H13 or even higher-grade filters. I would still like to explain here why H13 and higher-grade filters are not a good choice for air purifiers. A good air purifier's primary goal is to clean the air in a room as quickly as possible. There is a specific metric to describe this: CADR (Clean Air Delivery Rate). The higher the CADR, the faster the purifier captures airborne particles on the filter. Achieving a high CADR requires two conditions: High filtration efficiency – the filter should capture a high percentage of particles that pass through it. Large airflow volume – a large amount of air should flow through the filter per unit of time. If the airflow is large but the filtration efficiency is low, only a few particles are captured each pass. Conversely, if the efficiency is high but the airflow is small, the total number of captured particles is also low. But these two factors contradict each other. With the same fan, using a higher-grade filter improves efficiency, but it also increases resistance, which reduces the airflow. So a higher-grade filter is not always better. Filters like H13 or H14 commonly found on the market have very high resistance, significantly reducing airflow and thereby lowering CADR — meaning slower purification. After extensive testing, I found that the E11 filter offers the best balance. With about 95% filtration efficiency, its airflow loss is minimal, resulting in the highest overall CADR and thus the fastest cleaning speed.

Invisible Warfare Headline: The MIT Study that Finally Visualizes the Brain-on-COVID Have you ever had a medical scan come back "clear" while your brain felt like it was made of inflamed concrete? You aren't crazy. Standard medicine just wasn't looking small enough. A major 2026 paper from MIT and Harvard just changed the game. They didn't just look at brain tissue; they physically expanded it 15-20x its size—like using a molecular magnifying glass—to achieve 20-nanometer resolution. What they found changes everything: Standard imaging looks for damage. This paper visualized defense. Deep inside the brains of people who had SC2, they found periodic Amyloid Nanoclusters co-localizing directly with the virus. What does that mean? The Cargo: Your body is running on infected, hyper-activated platelets (the 'weaponized platelets' of LC). They carry viral debris and proteins into the brain's capillaries. The Body's Defense: When the brain detects these viral invaders, it doesn't wait. Its immune system (microglia/astrocytes) triggers a protective, antimicrobial "foam" called amyloid-beta. The Trap: This amyloid foam physically traps, cages, and neutralizes the viral proteins to stop them from causing further harm. The Price: The paper found a 2-fold increase in activated astrocytes, the cells that manage the brain's environment. These dense, sticky amyloid traps and swollen astrocytes create a state of permanent, local, architectural neuroinflammation. This isn't a "chemical imbalance." This is structural warfare. The brain is filled with tiny, persistent defensive knots that it cannot clear, causing the profound fatigue, cognitive impairment, and severe inflammation so common in LC. #LongCOVID #Neuroinflammation #Microbiome #VigilanceLab A comic showing this! Hope this helps my friends and fellow humans.

@WittyVitale Idea to pitch to the store: carve out space for a mini store dedicated to masks, papr's, cr box kits, uv lights etc. On site fit testing.

My favorite bookstore updated its mask policy and it's better than most: masks are required for staff and volunteers but not for customers. I appreciate the thought and effort they appeared to put into the policy. It seems one of the main reasons for the change is economical 1/3

@WittyVitale did you see this post? 68 pallets of n95 masks located in Simi Valley, CA 93065. We are not waiting for you to sell them to pick up. First come, first serve. No exceptions. NOTE: Minimum of 1-truckload up to 3. Contact Anthony at 818.912.3528

Since people apparently have missed the memo, FYI I am not just randomly obsessed with clits. I’m an activist for prevention of medical female genital mutilation because I was mutilated when I was barely 18 years old. My OB/GYN cut into my clitoris without my consent and damaged it permanently. This happened because of widespread censorship of anatomy known since 1672 from medical education and institutionalized disregard for female sexual function. This problem applies to ALL procedures involving this anatomy. It also causes there to be no help for women with damage caused by accidents or childbirth or with clitoral/vulvar causes of sexual dysfunction. I’ve changed 20 major medical textbooks, 6 online resources, 2 top anatomy apps, virtual dissection tables, anatomy posters, consent forms, medical org websites, board exams, etc. Here’s a poster I got updated to include clitoral anatomy. It’s still wrong.

The Swiss Re Institute suggests COVID will kill about 150,000 Americans this year (excess deaths), so it's more like a bad cancer than a bad flu. I would suggest talking to scientists who do Covid research and continue to take it seriously. My wife and I lead separate PhD programs. We homeschool so that our children do not experience the brain damage and other health problems from reinfections, which continue to pose a serious burden in 2026. It remains the most common chronic health condition in kids. A key reason why it might appear "milder" is that about 2 million Americans have died from COVlD (excess deaths). Wipe out 2 million people most vulnerable to any health problem, it will almost always appear acutely milder.

There are now more than half a million scientific publications related to COVID-19 and a rapidly growing body of evidence linking SARS-CoV-2 infection to immune dysregulation, microvascular injury, autonomic dysfunction, clotting abnormalities, viral persistence, and measurable cognitive changes. And to the people constantly sick, exhausted, dizzy, forgetful, exercise intolerant, waking up to feeling like you got hit by a truck on the daily or suddenly developing strange inflammation, heart issues, GI problems, or “mystery” symptoms after repeated infections… At some point you and society as a whole must confront the reality that repeated infection with a vascular and neurotropic virus was never as harmless as everyone wanted it to be. I choose to live in reality. That virus is still here. It is still spreading through the air. And it is still associated with long-term vascular, immune, and neurological consequences for many people. Protecting yourself from that threat — through cleaner air, better ventilation, filtration, vaccination, and high-quality masks in high-risk settings — also reduces your risk from many of the other respiratory pathogens constantly circulating around us. And if you are tired of watching people suffer while being told this is “normal,” then start demanding urgency. Ask why Long Covid clinics are closing instead of expanding. Ask why immunologists, virologists, neurologists, vascular scientists, and pathologists are not being funded at Manhattan Project scale to investigate viral persistence, immune dysfunction, clotting, mitochondrial damage, and cognitive impairment. Ask why billions can appear overnight for almost anything else, but millions living with chronic illness are told to “pace themselves” and move on. Support researchers (the ones who are still focused on Long Covid that don’t conflate the disease) Support clean air initiatives (two strong efforts happening in Illinois right now! Help us!!). Support disability advocacy. Pressure institutions to improve indoor air quality. Stop mocking people for protecting themselves. And stop accepting “everyone is sick all the time now” as a normal feature of modern life.

Hey I'm off private for the first time in ages, retweet this if you want to help me get back to my friends feeds OR if you want to make anti-maskers and homophobes really mad 🤷‍♀️🙏🌈

Any questions? The reactors are at Palos Verde nuclear power plant in Arizona. It also produces power at night and cloudy days. 95% capacity factor.

@lukas_m_ziegler thank you for giving us the basis for a scifi alien penis

A 40-year-old patent has finally been brought to life. That's the Y-zipper. A 3D-printed three-sided fastener that transitions any object from flexible to rigid and back again. The robotics application is the one that caught my attention. A quadruped robot that adjusts its leg stiffness depending on terrain, switching between rigid and flexible in real time without additional motors or complex mechanical systems. But this goes way beyond robotics. A wrist cast that loosens during the day and stiffens at night. A tent that pops into shape in 90 seconds instead of six minutes. The idea sat in a patent filing for four decades. It took 3D printing to finally make it real. ~~ ♻️ Join the weekly robotics newsletter, and never miss any news → ziegler.substack.com

@DaniBeckman Have you posted about how you found the new job? Looking for advice for my partner whose funding runs out soon. She's a neuroscientist who does 2/3 photon in vivo imaging.

I restarted my life twice by myself. First I moved to the U.S in 2017 from Brazil. Now I moved to Germany, again by myself in 2026. Am I terrified? Yes. Am I going to give up? Absolutely not. #GirlPower

I don't know who needs to hear this, but girl if you are unhappy where you are, with who you became, you can change. You can start again. You need no man, no family support, just yourself. And remember, you’ll never feel ready because being ready isn’t a feeling, it’s a decision.

@jenniferzeng97 The western enlightenment and scientific method nicely explains the difference between ancient and modern. Attributing modern technology to UFO's is a grave insult to all the scientists and engineers who develop technology.

My understanding is that aliens do exist and possess far more advanced technology than we do. Alternatively, our modern technology may have been given to us by aliens. If you compare ancient Chinese technology and knowledge systems with our modern technology and knowledge systems, you will find that they come from two entirely different frameworks. Hence, I believe our modern technology did not originate on Earth.

@ASychov combine it with a eye tracking stereoscopic display and it eliminates a lot of the friction with a headset. Not the fully immersive experience, but a step up from the usual.

I am sorry, but anyone who thinks this is "AMAZING FOR VR" has never been a true VR person. Immersive gaming is made to be immersed INSIDE the game, no to look at it on a flat screen with junky controllers. This software just cements "death of VR" even more 🤦‍♂️

Imagine being a scientist investigating vaccines in the U.S. After years of research and millions spent, your study is blocked from publication because your data doesn't support RFK's and the FDA's battle against vaccines. This is why people like me were forced to leave.

@Robotbeat congrats! please tell us about it

Got selected to fly my experiment to space. First time as PI. It's tiny, but still.

What if you could talk to your Bookmarks. linkagogo.com/blog/prompt-ba…