Luckily it wasn't a shockwave it was a pressure wave. If it had been a shockwave those buildings around that shoot would have been leveled.

It seems the initial shake of the camera is from the pressure wave traveling through the ground.

Possible, but I don't really think so. I think that the Medical minds of the time thought that physical shock, pressure waves from bombing etc. as you described, were a (or perhaps THE) primary cause of the psychological problems of returning soldiers. So the name "shell shock" came from there, but the symptoms that it was describing were psychological and, I think precisely equal to modern PTSD. Basically, "shell shock" became a polite euphemism for "soldier that got mentally messed up in the war and is having difficulty returning to civilian life".

My grandfather was an Army Air Corps armorer during WWII. He went through basic training, but his primary job was loading ammunition, bombs, external gas tanks, etc. onto P-47 airplanes. He was never in a direct combat situation, as I would describe it. He was never shot at, never in the shockwave radius of explosions, etc. But after the war he was described as having mild "shell shock", manifested by being withdrawn, not wanting to talk about the war, and occasionally prone to angry outbursts over seemingly trivial things. Eventually, he started talking about the war in his mid 80's, and here's a few relevant (perhaps) stories of his:

He joined the European theater a couple days after D-Day. Came to shore on a Normandy beach in the same sort of landing craft seen in Saving Private Ryan, etc. Even though it was days later, there were still LOTS of bodies on the beach, and thick smell of death. Welcome to the war!

His fighter group took over a French farm house adjacent to a dirt landing strip / runway. They put up a barbed wire perimeter with a gate on the road. In one of the only times I heard of him having a firearm and being expected to potentially use it, he pulled guard duty at that gate one evening. His commanding officer gave him orders to shoot anyone that couldn't provide identification on sight. While he was standing guard, a woman in her 20's rolled up on a bicycle, somewhat distraught. She spoke no English, only French. She clearly wanted to get in, and even tried to push past my grandfather. By the letter of his orders, he was "supposed" to shoot her. Instead, he knocked her off her bike when she tried to ride past after getting nowhere verbally and physically restrained her. At gunpoint! When someone that spoke French got there, it turned out that she was the daughter of the family that lived in the farm house. They had no food, and she was coming back to get some potatoes they had left in the larder.

Riding trains was a common way to get air corps support staff up to near the front, and also to get everybody back to transport ships at the end of the war. On one of those journeys later in the war, my grandfather was riding in an open train car with a bunch of his buddies. They were all given meals at the start of the trip. A short while later, the track went through a French town. A bunch of civilians were waiting around the tracks begging for food. I'll never forgot my grandfather describing that scene. It was tough for him to get out, and then all he managed was "they was starvin'!" He later explained that he and his buddies all gave up the food that they had to those people in the first town -- only to have none left to give as they rolled past similar scenes in each town on down the line.

When my mother was growing up, she and her brothers learned that they'd better not leave any food on their plates to go to waste. She has said that the angriest she ever saw her dad was when her brothers got into a food fight one time, and my grandfather went ballistic. They couldn't really figure out what the big deal was, until years later when my grandfather started telling his war stories and suddenly things made more sense.


A lot of guys had a much rougher war than my grandfather. Way more direct combat. Saw stuff much worse -- and had to DO things that were hard to live with. I think the psychological fallout of stuff like that explains the vast majority of "shell shock", without the addition of CTE-like physical head trauma. I'd wager that when the docs said Stewart's father's shell shock was a reaction to aerial bombardment, that was really just a face-saving measure to try to explain away the perceived "weakness" of his condition.

I feel there's confusion here.
The term "shell shock" covers two different things.
One is purely psychological, trauma over seeing things your brain can't handle. This is what most people think of when they hear the term.
Two is physical, and is CTE like football players get, caused by pressure waves from nearby explosions bouncing their brains inside their skulls. It sounds like this is what Stewart's father had, as it causes violent tendencies, confusion, and uncontrollable anger.

I had not realized that the solid rocket boosters were steerable....at least I hope they are moving the nozzle intentionally and that it's not moving around on it's own.
Incredible camera...at 1/4 speed you can see the pressure waves move through the flame trail.

Jesus, thunderf00t is such an arsehole, even when I agree with him, I still want to punch him.

What was the point of the digression about pressure waves?

And as for getting the aluminium powder from an etch a sketch... I dunno, maybe if you're engaged in a criminal enterprise you don't want thermite ingredients showing up on your amazon history?

Or maybe because "let's order the ingredients online" IS A FUCKING BORING STORYLINE.

I'm not arguing that it doesn't exist, or even work to an extent. I'm just saying it's not what I meant by 'movie silencers' where a simple tube suppressor is screwed to a simple barrel end with a 3/4 twist.
It's neat, but not what I'm talking about.
That said, 'nearly airtight' leaves leaks that allow pressure waves to escape, defeating the purpose of the suppressor to an extent. Also, high pressure water and gas is not the same as explosive pressure waves, I hope this isn't just a modified hose quick connect, the pressures dealt with are on different levels.
The SOCOM pistol example seems to say that, even with the bonus of much faster field installation/removal it wasn't worth the weight or didn't work properly, or both. There's a reason they went with difficult to keep clean and hard to install machine threads.

I'm still worried about phase. The argument is that he can represent any phase he wants. I challenge him to represent different phases of his Nyquist frequency without the reconstruction losing power. He keeps saying "band limited", which I don't believe to be exactly true. I agree, the ear can only detect powers at frequencies below 22.1k, I'm not convinced it's ability to detect phase shifts is limited in the way you would expect with a digital signal with a cutoff at that frequency. For instance, the human ear can localize an impulse with accuracy down to about 10 microseconds. I can't see how a Dirac function can be localized that accurately by a sampled wave unless the system acted like a 100K sampled system. The latter, IMHO, is supported by the neuro-anatomy. There are different mechanisms for identifying pitch and onset. The quote-unquote Calyx of Held neurons carry the phase information, and are designed to fire with astonishing precision. Much more temporal precision than would be predicted from the "nyquist frequency" of the place coding subset of 8th nerve ganglia. I understand that this is what he was trying to address with his bit at the end, but he kept insisting on "band limited" inputs. Pressure waves aren't band limited dodge-rammit.

>> ^messenger:

I think you're onto something, but to me it looks a bit different. I downloaded it have been looking at the individual frames. The deformation wave from the bottom doesn't reach the top until after the bottle is too deformed by other forces. The top of the bottle, including the cap, started moving into the bottle in frame 2 of the explosion. In that same frame, you can see one point that's not moving in about half-way between the cap and the wide part all the way around. It looks like a bulge going out almost as fast as the top is coming in. That bulge forms the leading wave of the rest of the bottle coming up. If the cavitation was powerful enough to suck the top of the bottle in, surely it would also be strong enough to also suck the (much weaker) sides of the bottle in too, especially the point where the bulge starts, but in fact, the opposite happens.
You gonna tell Destin? If you don't, I will.>> ^Boise_Lib:
My thought is that the top area is slightly thicker and stronger. As the bottle circumference deforms outward it pulls the top down. It seems the top only comes down after the bottle is already ruptured by the pressure wave--that's why I think the pressure isn't affecting the top.



My hypothesis is easily falsifiable. If the top half of a bottle had an expandable jig placed into it and the outer circumference of the top 1/3 of the bottle was stressed outward would the top portion be pulled down?

If you want to communicate with Destin be my guest--but I want credit when they hand out the Nobel.

I think you're onto something, but to me it looks a bit different. I downloaded it have been looking at the individual frames. The deformation wave from the bottom doesn't reach the top until after the bottle is too deformed by other forces. The top of the bottle, including the cap, started moving into the bottle in frame 2 of the explosion. In that same frame, you can see one point that's not moving in about half-way between the cap and the wide part all the way around. It looks like a bulge going out almost as fast as the top is coming in. That bulge forms the leading wave of the rest of the bottle coming up. If the cavitation was powerful enough to suck the top of the bottle in, surely it would also be strong enough to also suck the (much weaker) sides of the bottle in too, especially the point where the bulge starts, but in fact, the opposite happens.

You gonna tell Destin? If you don't, I will.>> ^Boise_Lib:

My thought is that the top area is slightly thicker and stronger. As the bottle circumference deforms outward it pulls the top down. It seems the top only comes down after the bottle is already ruptured by the pressure wave--that's why I think the pressure isn't affecting the top.

>> ^messenger:

Hadn't thought of that. So, the wave of deformation goes up the bottle, and pushes the top down?>> ^Boise_Lib:
I think the top is "sucked in" because of the deformation of the rest of the bottle.



My thought is that the top area is slightly thicker and stronger. As the bottle circumference deforms outward it pulls the top down. It seems the top only comes down after the bottle is already ruptured by the pressure wave--that's why I think the pressure isn't affecting the top.

>> ^dannym3141:

Could people explain to a layman the significance of moving him into the other side of the trench? Is the point that "seems ok" is nowhere near as good as 5 feet of solid soil? Because i suppose i'd be part of the "seems ok, but i'd much rather be behind 5 feet of soil" camp. Confident people are acting like he'd have been 100% dead if he'd not been pulled down; i'd like to hear your expertise.


The pressure wave in the air would of killed him more then likely. Being that close to the explosion causes a difference in pressure and that can kill the human body. Concussion grenades work that way.

http://en.wikipedia.org/wiki/Concussion_grenade#Concussion

There have been a few possible theories, a more like a strong hypothesis, that has alternate ideas for the presence of Dark Matter. One of which is simply more a misunderstanding by us of the nature of what is happening at a fundamental level concerning the internal structure and spin of galaxies; their part and full presentation into the full dynamics--the true inner workings--isn't fully realized yet, but they assert a new reason for the discrepancy in how the galaxy spins at different radii in that galaxy and in fact kill off the need for Dark matter. Secondly, it's our mathematics involved that have created this absolute need for Dark Matter to even exist, which is explained in the last part about this subject below. Lastly, a few findings like the outer arms, the large gas/ice/dust/etc... volumes (nebulae and plasma lit regions) and the stars (and their systems)--their movement rate on the outside edge of their respective galaxies, which if like "normal physics" (I quote that because if we made a mistake, the fault will always be ours and not the Universes ) would seem to show that the inside should rotate faster than the outside edges, which is not what happens at all--they rotate at the SAME speed. The actual math involved to solve this little mystery shows that there HAS TO be a large chunk of the Universe missing to get the mathematics to finally spit out numbers that work out. They have provided their own set of new cosmological equations that describe the motion within a galaxy; as of this writing they have tried the new math equations on four different galaxies that are known well. The reason this one has most likely been called a theory as of late is due to their new equations completely and correctly describing the motion of those galaxies, from origin, even until their virtual deaths--that makes this small theory the strongest front-runner for getting rid of Dark Matter altogether. This was a large paragraph, I made it small to make it a tad more readable.

But, Dark Matter is a very well-held theory for the scientific community though and it still has quite a bit of evidence for it's case as well. It has much more proof than this smaller theory does, but it's good to keep an open mind and let your mind run free with new ideas every so often as it may give you a new idea as well. Due to an idea I heard from a physicist: Lawrence Krauss, I was thinking about the Universe and some implications concerning Quantum Mechanics with possible larger scale events that are occurring with cosmologists looking for ways to explain things, but they are basically on the run--the fresh ideas are gone. Because, of the little creative idea above that explains away Dark Matter it triggered a provocative idea, one that I'm not qualified to answer or really even guess at (beyond it's initial qualities)--so I will send the idea off and see if they can maybe visualize what I'm implying just a little more clearly. I'm not entirely sure there will be a correct way to view this idea due to it's near "virtual"-like impact on our Universe, one that may be unprovable except for three possible ways I can think of. Two of which are beyond are capability right now, but we will have the ability later and the last using Quantum Foam experiments to look for certain types of superposition maybe even using entanglement (it would need to be a semi-radical setup that is "one-sided" in nature and using information concerning Dark Energy, as I'll finish here at the end of the sentence) that may relate to information that might be probable to gain through later scientific gathering, like the expansion rate or if it's nature is confined merely to space-time or if it actually occurs eventually all the way down to the subatomic.

I had the idea that perhaps Dark Energy could actually be the tell-tale signs of an existing second Big Bang merely hidden under our collective noses due too space-time and it's nature (maybe it's fairly "structurally sound" when it comes to a bubble fight) or it's an active component of the Quantum Mechanical universe, perhaps directly attributed to the Quantum Foam. I'm wondering--and of course I've got no real idea what a Universe "pressing" upon us might do, if this could even happen--if Dark Energy is the pressure wave of perhaps a secondary Universe, probably very much like ours,but the logical, mathematical,constants, and theories have either become slightly different to a lot or the Universe is unlike anything in our book; but I'm assuming it came from the same Quantum Foam that got us here which means it may have more in common with us that we know.

I'm going to try and get some more feedback on this and see if it proves to go elsewhere and opens new doors.

It sometimes bugs me when people assume a "sonic boom" only occurs when the aircraft passes into, and then out of, supersonic flight. When in fact, the boom is a pressure wave that continuously propogates along the flight path, more of a "sonic roar" and only a boom because YOU aren't moving.


(ps. this isn't a comment on anything people have said here, just anecdotal)

I imagine that bullet was going quite slower to than a normal shot due to the pressure wave fucking up at the ignition point...