As for the electrostatic wall story... it's fun but I don't believe it.
I’m struck now with how much power one site has to engage and help so many people. I hope that I can share enough of my own goofy hobbies  to help a new generation learn what inspires them.
You'd have a set of sites without any tracking or ads, and you might have it much easier to find high-quality sites like these.
- video of a tiny version https://youtu.be/vL3mnidBkeQ
- someone claims that objects do bounce off it
- someone claims that others made accidental forcefields
After twenty years I finally tried a forcefield experiment: HVDC supply hooked to perfmetal electrodes as mentioned on Reddit. Nope, the high-field gap has no effect on intruding sticks, or even blocks nylon filaments. And reducing the gap just triggers big sparks. (But maybe it needs some 100Meg resistors, to stabilize it like an NE-2 neon bulb?)
I first saw a version of that diagram just a couple of months ago at 34c3 in this _excellent_ talk on synchrotrons and free electron lasers which delivered more than one such "aha!" moment. It's a great diagram, and it's a very worthwhile talk.
1 - https://media.ccc.de/v/34c3-8832-free_electron_lasers
I hope his site always keeps that 1996 era look to it. :)
One of his pages that I never forgot was the one on Traffic Waves:
I would tell people for years that we could alleviate traffic in LA if we paid small fleets of cars to drive a certain way and got laughed at. Well, now there's this(cited in the page above):
"A Single Autonomous Car Has a Huge Impact on Alleviating Traffic"
TLDR for others: coherent = as if from point source.
I had also tried to make a dermal regenerator after reading an article in PopSci about infrared radiation speeding up ulcer healing in cancer patients. Didn't have a good way to test it but I liked to think it worked. :)
The funny thing is the beds glow red I guess the word literally meaning beyond red (i.e. can't see it) won't sell if there isn't any red to be see.
More exactly, below. (Lower frequency, outside the visible interval with ultra-violet at the other end.)
As in 'infra-dig' meaning something being 'beneath dignity' to be done, https://en.wiktionary.org/wiki/infra_dig
Seriously, I tried to find actual scientific evidence of what a "knot" is in a muscle, and there seems to be none. My wife swears she can "feel it," but I have yet to understand any real health benefit of massages.
I’ve never seen a scientific description, but I have always assumed that the muscles were “stuck” in some kind of contracted state. It is so obvious, my guess would be that there would be a physical state that could be ascertained by biopsy or autopsy. Apparently, this is not a popular topic for research.
Physical manipulation can have an effect on muscle contraction state, as can heat, other forms of touch, relaxation techniques.
The release of these contractions is experienced as a very good feeling by most people.
FWIW, I have had forms of bodywork done on me that focused more intense, deep pressure into the muscles. I notice much more of a longer lasting effect than from simple massage. The effect wears off within a day or so.
I do think there is a health benefit to such manipulation. In my case, releasing such tension helps me hold body positions that minimize the impact of repetition strain injury that I have developed from poor ergonomic habits working at a computer.
It's true that we understand electrostatics qua electrostatics very well. But it's not all that crazy or controversial to suggest that the intersection of electrostatics with other fields from material science to meteorology still holds some surprises.
Apropos of oddities surrounding products from the 3M company, we thought we understood X-rays pretty well, too, and then someone discovered that they're emitted when you peel off some Scotch tape.
> It is well understood that during a thunderstorm there is charge separation and aggregation in certain regions of the cloud; however the exact processes by which this occurs are not fully understood 
The challenge arises with explaining how the charge is contained such that the opposing charge that is being attracted does not break down the insulator between it and this charge. One thought experiment that I heard at the Boston Science museum was to imagine you are inside the ball of a very large Van De Graff type generator. If you were charged to the same polarity of the outer sphere, you would be repelled by the sphere toward the center. The harder you tried to go to the edge, the more you would be repelled. And, assuming you were insulated from the sphere. By clothing or some other apparatus, there would be a point where the electrostatic repulsion would keep you from being able to touch the sphere and effectively discharge your charge into the sphere.
This only works as an explanation if the manufacturing facility was acting as the sphere, and on entering it you found your self inside that sphere and with a net charge of the same polarity.
What is most remarkable about the story, and causes many (myself included) to doubt it, is that 3M is/was a company that was famous for its core competency of taking unexpected effects and turning them into products (the post-it note story is a great example of that). Because of that competence, it is challenging to imagine that they had accidentally created something, which if understood better could potentially be the foundation of a multi-billion dollar product industry (force fields are widely sought out by people wishing to exclude access). And yet they left it as a "wow, that's funny" sort of moment? A more expected outcome would be for 3M to build an identical plant to see if they could replicate the effect and if they did, begin to instrument and remove components until they understood (and probably patented) all of the ways the field could be generated. And then decided if it was possible to make as a product or not.
Here is an example using gravity but electrostatic forces should operate the same way. https://www.grc.nasa.gov/www/k-12/Numbers/Math/Mathematical_...
You can only feel forces if it's some other shape.
(cf. https://en.wikipedia.org/wiki/Shell_theorem for some proofs)
In the case of a charged conductive sphere, the charges are free to move. With no charge present other than that on the sphere they will arrange themselves spherically symmetrically.
But if there is other charge near the sphere (outside or in), shouldn't that cause some rearrangement of the charges on the sphere, breaking in most cases the spherical symmetry?
Also, one of Maxwell's equations (in integral form) says that the total electric field passing through a closed surface is proportional to the amount of charge within the surface. If you consider a spherical surface just inside a uniformly charged sphere, with no charge inside or outside the sphere, there can be no flux passing through this surface (since the total flux must be zero and the field is obviously symmetrical). In fact this is true for any closed surface inside such a sphere.
I've seen this link being passed around in the paranormal/conspiracy circles as a possible Earthly explanation for those UFOs the NYT reported a while back:
One theory is these "tic tacs" are yet another example of test aircraft being mistaken for extraterrestrial aircraft and this paper's findings were noted and expanded on, in secret, to create some novel form of propulsion by either the US or China.
There's precedent for human test craft being mistaken for "alien" technology. The best example being a rash of "triangle shaped UFOs" in the early/mid 80s was eventually revealed in 1988 to have been the F117.
All matter has a charge too so I could see with the right conditions a large electrostatic force being formidable.
A large VDG such as those in some science museums for example, could cook your noodle.
From personal experience, static discharge against such material is a lot less painful than touching grounded metal objects.
> Several unanswered objections mark the story as a possible hoax:
2. Wait until it's -30F outside, open the doors to let that dry air in. Close the doors.
3. Heat the interior to +70F to make --extremely-- dry air.
4. Shuffle across the plastic carpet in leather-soled shoes.
5. Do NOT touch the metal door knobs.
Like i didn't already have a reason for insisting on natural fibers.
>> When he attempted to walk through the corridor formed by the moving film, he was stopped about half way through by an "invisible wall."
A corridor formed by the moving film?
I have a hard time understanding the situation.
> The film was taken off the main roll at high speed, flowed upwards 20ft to overhead rollers, passed horizontally 20ft and then downwards to the slitting device, where it was spooled onto shorter rolls. The whole operation formed a cubical shaped tent, with two walls and a ceiling approximately 20ft square.
"Why didn't they take pictures" is a minor question, compared to "WHY DIDN'T THEY THROW STUFF AT IT?!!" Did the invisible wall block flying objects? Or was it really just caused by shocks, by tazed human muscles locking up?