Diagram for Hoodie Viral Helmet

The world’s best COVID mask costs $15. At that low price, which is cheaper than a COVID test or a COVID vaccine shot, there’s no way that cost should be something that stops people from being protected from COVID.

Today, the $15 Hoodie Viral Helmet™ is introduced. It’s not something you can buy. It’s a free-to-built set of plans to build something called a Viral Helmet. You can buy a pretty-good viral helmet for about $300. Or, for $15, you can have better-than-hospital protection.

There’s been a lot of focus on better masks, double masking, and N95s. There’s a better option, and that’s PAPRs. Filters are 99%+. More importantly, there are no significant leaks because fans generate positive pressure. Unfortunately, they normally cost about $2000.

Makers have worked on many cheaper versions for COVID. The Stanford pneumask “snorkel mask” is under $50. The Hoodie Viral Helmet I worked on is about $15 at scale and open source. BunnyPAPR.org has a $30 version aimed at hospitals. A few dozens of other ones can be found on google.

  • Better filtration with hospital-grade filters. [1]
  • And no…

Letter to the Editor of The Atlantic on the need for better masks.



As the authors wrote, any mask is better than no mask, but America is stuck having inferior masks. Wouldn't it be nice to be able to test how good a mask is, both in filtering and fit?

There is a test that works, is proven, and is cheap: a saccharin taste test. Saccharin is aerosolized. If the fit has leaks or the mask material is poor, then the wearer will taste saccharin strongly.

This is essentially the method behind the officially recognized QLFT fit test…

Following up on my previous article, I’m making more graphics about the “1 hour rule” — a simple idea to help people think about airborne COVID transmission.

If you want me to make a graphic, please go ahead and pitch it to me in the comments.

For #3: I know Uber drivers must wear masks on trips. And riders probably do too. But, there’s a hidden risk: once the passenger leaves, does the Uber driver mistake that they are safe? If #CovidIsAirborne, that means they need to air out the car first. (You don’t have to air it out for…

SHORT VERSION: Ventilation can make a big dent in COVID spread, and doesn’t require individual compliance (works even if someone is a “denier”). But its currently too niche and we need to overcome a big legal issue.

As we are dealing with the second wave worldwide, my favorite aerosol twitter personality, Linsey Marr, recommends doubling down on an “all of the above” strategy.

And, many people who are worried about long-life aerosols are focusing on ventilation.

And ventilation IS a better strategy. It doesn’t require you to do anything special. In fact, hospital surgery rooms run their ventilation…

Viral helmets — free the face & see the face

This open letter was sent to Nevada casinos, gaming unions, and government officials on Jan 2, 2021.

What do casinos and schools have in common? They both operate best in-person, and COVID19 is disrupting operations greatly.

What if I were to tell you that we could safely open:

  • Something that has better protection than N95
  • Something more comfortable than regular mask (because it has a built in fan)
  • Something that lets you see the whole face

That is the new effort to build viral helmets.

Viral helmets are safer, more comfortable, and let you see the whole face.

Viral helmets…

4 examples of viral helmets, from viralhelmets.com

Those are pictures of Viral Helmets above. We can give them to every essential worker in America, like those at Costco who just got sick.

  • They cost as little as $30.
  • They have a fan and are more comfortable.
  • And they filter much better than masks… like 100X-1000X better.
  • But they still aren’t getting any attention…. read more below


First, some context. America is supposed to be doing better. We’re mostly wearing masks. We all know the CDC’s 6ft rule. But the virus keeps spreading. We are doing a lot, but it’s not enough.

And now we hear that Costco…

There are six things that control the spread of the virus really well.

  1. Crowds- avoid
  2. Activity- reduce talking or other things that generate “microspit”. Including 6ft spacing and avoiding indoor restaurants.
  3. Protection- wear it
  4. Time- reduce your exposure (like work from home)
  5. Infection High?- close the store
  6. Ventilation- increase it

#1, 3, 4, and 5 are familiar. [Crowds, protection, stay home (time), and shutdowns (infection high — close the store) are familiar.] Ventilation is getting a lot more attention, and people sorta know what activities are higher and lower risk.

But, if you are an essential worker, this doesn’t matter…

This is an open letter from Dec 31, 2020 that I sent to the Brookline school stakeholders. It’s so sad that so many “essential” workers are getting sick. And disproportionately low-income and people of color. The $30 BunnyPAPR could safely protect all of them, regardless of how unsafe other people are.

My sincere hope is that 2021 opens up to better masks and more interest in better masks. Masks can be really excellent, and when they are, they can provide full-proof protection.

It’s also not just masks, but also distancing, better ventilation, shorter time, and also catching all the hidden…

The majority of Americans are wearing masks, but many of them are still getting sick. So there must be some hidden risks. That’s where the 1-hour rule comes in. Don’t take off your mask unless you know who has been in the room for 1-hour.

Why? Because COVID can linger for 1 hour.

CDC acknowledges this in Nov2020. "Smaller droplets and particles... can remain suspended for many minutes to hours and travel far from the source on air currents." https://www.cdc.gov/coronavirus/2019-ncov/more/scientific-brief-sars-cov-2.html

Before going into the rule, let me tell you two stories I’ve heard.

  1. Elevators. “Amy” and her boyfriend were at…

ViralHelmets @ ViralHelmets.com

Entrepreneur and former professor. Working on projects to help move the needle for good, during the coronavirus pandemic, 2020.

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