The market for their airliner was razor thin to non-existent. It was a shiny object for investment capital just like the Otto Aviation Celera was. This is a pivot to another pipe dream investor pit. The company has never operated the engine under its own combustion. It probably won't for a long time, and they have zero capacity to absorb the inevitable engine failure mechanics/destruction that will accompany real engine tests: they do not even have one engine built. They don't have a spare. They are making shiny objects for clueless YouTuber creators to cover, and even more clueless investors to gargle at. That is all.

A person from the Evandale GE plant in Ohio who actually spent 14 years in the group that adapted their 50-70 year old engine designs for fixed asset use has seen the engine up close and claims that Boom is a very, very long way from being able to sustain an engine test from his own look at the same display that Scott Manley outlined in his tour. He also said that "many" of the parts were clearly for show and not actual serviceable parts, and a very different story was proclaimed by the company representative.

To me, this is an investor bubble company that was crowded out by the AI and fusion investment bubbles and is looking for another shiny object to suck up cash. After the AI crash, there will be perhaps 2 -3 years of recovery time if we are lucky before there will be real cash on offer for these kinds of 3rd tier investor cash sponges.

The survival rates after intubation range widely by demographics between 10% and 60%, averaging closer to 50%.

That's a lot better at both ends than without.

Every paper and release in medical journals to date on the use of noninvasive ventilation for the present Covid-19 outbreak shows it is useless for all but a thin sliver of patients, and has a high potential to kill people rather than save their life.

Every one of the papers. Not a single one in favor of emergency therapy with nonincasive vents compared to high flow O2.

In addition, the lack of expiration filtering typical of them has been a realized infection threat for medical personal- it infected lots of Chinese medical personnel.

The bottom line: high flow oxygen (cannulas more than masks), and intubation with aspiration and full mechanical ventilation is the only therapy that improves outcomes for easily 90% of patients, despite an overall continued use of 30% to 40% in the field of noninvasive ventilation.

This is what the data says. Nonincasive vents dont aspirate fluids from the lungs, and can cause damage, and present infection risks greater than intubatiom and generally greater than benefits at all for ARDS (acute respiratory distress syndrome) patients.

These DIY units are laudable but largely useless even in a worst case scenario, as much as it would be nice to be otherwise.

Don't cite papers that are behind pay walls. Period. If the authors want impact, publicly publish.

These files are in the open. The are publicly available to anyone who wants to look. I found several in minutes.

This ITAR issue is prior restraint...trying to put the genie back into the bottle. It reminds me of the silliness in trying to get people with security clearances to not read the Snowden files.

It is public record. Subjecting it to ITAR at this point simply makes it glaringly clear just how incompatible ITAR is with Constitutional principles.

...in which case we may finally verify what happens when a near sonic hyperloop car encounters a sonic flow of atmosphere going the opposite direction.

Hilarity ensues.

Problem solved.

Autonomous vehicles turned into car bombs...Guy with a home wet lab and a lot of savvy creates a serious disease and releases it, someone poisons an an entire metro areas water system....

These things are several orders of magnitude easier, more damaging, and likely than a nuke. I'm not worried about those things, so how am I going to find the time and motivation to be worried about rogue nukes? Anything can happen, but I can also stub my toe.

Solution: Quadcopter. Camera. Paint ball gun with some sturdy thick, solvent based paint. If the paint won't cover it, the solvents will render them useless.

https://www.eia.gov/todayinene...

https://www.ovoenergy.com/guid...

Both have base rates in the high teens, plus taxes, to net at 35-40 cents per kWh retail. The US levelized costs also include these costs (about a third of Denmark or Germany retail costs).

Perhaps someone needs to take pics of cops and post them publicly and to their managers as well.

Should we suspect all men of being terrorists or wonder why they outnumber female international terrorists 99 to 1?

Statistical navel gazing.

Unfortunately, even at great depth, underwater explosions in contact with any surface can easily be intense enough to induce substantial cavitation. The long duration impulse from the explosion is converted to a very short duration impulse on collapse. This impulse is sufficient to cut though plate steel at appropriate depths (at depths where the close proximity pressure wave intensity is greater than ambient pressure) . The confinement of the explosion impulse to a small area at greater depth allows a relatively efficient conversion to the impingement energy. The time available to lose energy thermally is greatly reduced. The impulse intensity and duration in these kinds of operations is more than sufficient to blow apart an optical cable about the size of your thumb... by a wide margin.

Other than that, being in close proximity to a cable of that size, it is far easier to simply cut them.

The Russians, Americans, French, British, Germans, and others all have active programs to disrupt undersea communications, and they have had them for a long, long time.

This is not rocket science. A group of undergrad and graduate engineering students has demonstrated the use of low-end side scanning sonar and Rube Goldberg AUV tech to detect and track underwater cables for up to 2 weeks and 350 miles autonomously. The cables themselves are scarcely bigger than your thumb in deep water, and quite fragile (easily cut or percussively disrupted). The current they carry (yes, the optical ones too) are detectable from dozens of meters with inexpensive sensors as well.

The undersea infrastructure has always been prone to periodic failure, let alone vulnerable to deliberate attack. There is little a determined naval forces can do to prevent these possibilities aside from attempt to provide redundancy, which is not a military function, or deterrence, which is arguably a function that can be effected with political or non-naval resources better than naval resources.

The bottom line: nothing new here, no greater vulnerability exists now than before the Navy was fighting the backchannel war to feed the mouthbreathers to get more funding.

Journals were once curators of information relevant to a subject for areas of interest outside the reach of traditional library curation.

Library science has been quietly and revolutionarily been relegated to obsolescence in the age of the internet.

Journals would be functionally relegated to the same fate were it not for an additional value they add to academia...the constant search for prestige and citation that academia demands.

A Nature pub simply offers more social intangibles than Arxiv.

More societal benefit might be derived from other open access alternatives, but those alternatives offer no career and personal intangible benefits in the way that Nature offers.