MigL

IIRC many years ago, PCB based organic fluids were used for heat transfer/fire resistance in transformers. Very unreactive and non-degradable. But since they pose various health risks, are no longer available.

If I have to tell you, you don't.

I am most familiar with aerospace companies. The Ukraine has the largest designer of military transport planes in the world; the Antonov design bureau. Unfortunately, the USSR production model consisted of various design bureaus ( MiG, Sukhoy, Tupolev, Yakovlev, etc ) with the actual production being undertaken in various state production facilities ( all in Russia ), as Russia was the biggest customer. When the Ukranian conflict with Russia started, Antonov had the designs, but could no longer produce them, or sell them to their main customer. They have been looking for many years, to put Western equipment in their products ( an148/158 regional jets, an178 military transport, an70, an32, an124, an225, etc) Lately as others have gotten over their distrust of Ukranian corruption, a few Western aerospace companies ( Boeing ) have collaborated with Antonov. And Antonov has set up a production facility in the Ukraine. Most of their profits don't come from equipment sales, but from renting out their an124 Ruslan to Western air forces ( NATO ), and their biggest ( ! ) seller is the one copy of the an225 Mriya, originally built to ferry the Russian space shuttle. It is the largest transport plane in the world, and so in demand, that Antonov is attempting to complete a second unfinished copy that's been in storage for years. So no YJ02, things are not so rosy for defence contractors in the Ukraine. Recently their Jet engine producer, Ichvenko-progress, was stopped by the US state department from getting into a collaborative venture with a Chinese firm. The fear was that China, who has been having trouble producing jet engines ( must be that cheap Chinese metallurgy ), would gain valuable technology transfer from the Ukranians, who have the technology, but not the market.

I can't imagine the studies quoted by the two sources ( in the tweet ) were very scientific. Of the people who are not shown the facts, exactly none change their minds ( why would they have to ? ). Of the people who are shown the facts, at least a few ( those without mental blinders ) have to change their minds. But I like the humor in the tweet anyway.

Trying to consider one common original 'now' is similar to considering an original spatial singularity. GR's applicability has boundries.

I don't know if you have access to Gravitation ( Misner, Thorne, Wheeler ) Geordief, as that has a 'fairly' readable explanation of gravitational wave phenomena.

Really Zap ? I don't think JC is at all what one would normally consider 'Right wing'. I'd be willing to bet JC doesn't own any guns, and has voted for more social services than you can ever imagine having. Having an opinion about what is just, and what is wrong, doesn't make you 'right wing' or 'left wing'. ( maybe it makes you opinionated, but I've been accused of that too )

Come on now... You guys are getting silly with the down-votes. Lethal and non-lethal war equipment is a common definition and is used by the American government for the purpose of foreign military sales. It is just coming across as a bias/dislike of a particular poster.

If things don't go as well as Stringy believes... Do you guys have impeachment over in the UK ?

The way I understood Geordief 's question, md65536 ... He is not considering global space-time ( otherwise known as 'block universe' ) as that already includes past, present and future, and as such, is not subject to evolution. What he is considering are the 'foliations' of space-time, and how the foliations 'evolved' from the origin till now. As each foliation is an instant in time, the concept of a global foliation is non-sensical, as that implies a common global instant in time, otherwise known as a 'universal now'. That was my objection to the ill-posed question.

A global geometry, as you are considering, is not possible. Maybe Marcus or Mordred can provide further insight, but as far as I know, a single, or global, 'foliation' ( or Cauchy surface ) of space-time is not possible. Aggregations of local surfaces are.

Gravity as we know it ( GR ) would have appeared as soon as our universe moved from the quantum foam stage to one where geometry became apparent. Somewhere around the Planck scale/era ( if it ever was that compacted ).

It isn't that simple YJ02. One could argue that both presidents withheld military aid, but B Obama did it to minimize deaths in the conflict, even though this resulted in a number of deaths. D Trump withheld aid for personal political gain, and this resulted in a number of deaths. One position can be defended, the other, not so much. And pointing out the loss of life due to D Trump's extortion attempt should be allowed. ( although I'm with you in believing that this impeachment process will go nowhere, and may actually be detrimental to Democrat aspirations to form the next government )

I know what a scalar field is. What is a scalar wave ? Could it be related to your other OP on brain EMF emissions ?

You can't separate the field form the mass/energy causing it. It does not evolve, and didn't originate with the Higgs interaction. As mass/energy changes configuration/collects/breaks apart, all individual components carry their field with them, changing/adding/subtracting respectively. Asymmetric changes ( as opposed to symmetric ) generate gravitational waves which carry away some of the mass/energy, such as the recently observed orbiting BH merger.

In case you don't read it on the other thread... 6 hours ago, iNow said: "Apparently, now I'm taking incoming fire even within threads where I'm not participating. Good times..." No, you're not taking fire, INow. The people who arrived at their opinion without reasoning are the D Trump supporters. Not you ! The point I was ( unsuccessfully ) trying to make is that, for those people, "contrary evidence only tends to harden their resolve". Sorry for the misunderstanding; you know I love you .

Any way you look at it, You Brits compounded a bad decision with another one. I get the impression people didn't vote in support of Brexit, but in support of ending the instability and indecisiveness of the last three years. Basically they were fed up with the whole thing. My opinion of Brexit has always been akin to 'throwing out the baby with the bathwater'.

No, you're not taking fire, INow. The people who arrived at their opinion without reasoning are the D Trump supporters. Not you ! The point I was ( unsuccessfully ) trying to make is that, for those people, "contrary evidence only tends to harden their resolve". Sorry for the misunderstanding; you know I love you . I seem to have suggested the same sentiment in the Greta Thunberg thread, but it was pointed out to me that the time for reasoned discussion is over, and we need to appeal to peoples emotions to convince them of the seriousness of AGW.

That explains a lot. Can I quote you to INow on the D Trump impeachment hearings thread ?

If only J Trudeau, of the many faces ( black, brown, two, etc ) would have the integrity to do the same...

The internet is the great equalizer. It gives ignorant people the ability to spread their lack of knowledge to other ignorant people. We try to fight a little battle against the spreading ignorance on this forum.

No MAGA hats in my closet, YJ02. I'm Canadian. Besides hats mess up my hair.

I know I'm often guilty of the same thing, but if INow and Zap on one side, and YJ02 and JC on the other, would pause before re-posting and ask for clarification of a comment made by the other side, instead of assuming and bringing their own biases into play ( yes, we all have them ) this conversation/discussion would be a lot more congenial. I think we all agree that D Trump is bad for the country ( and the rest of the world ), we just have a different perspective on which method/process for removal would do the least damage to the country and its government.

That is simply the equivalence principle. You remember the thought experiment of the elevator, in space, accelerating upward at 1g being indistinguishable from standing on the Earth ( to a local approximation ) ?

Why is it not relevant, Strange ? Sensei implies that stress increases hormones which may result in homosexuality. And that assertion seems plausible, as has been mentioned, causes for homosexuality could be genetic, hormonal ( in the womb ), environmental, or various combinations/degrees of the three. I certainly don't believe it's simply a mental ( preference ) issue, as in some people like 'sweet' and some others like 'savory'. ( It would be nice to see a source for the experiments you mention Sensei ) The fact that the stressor for the rats was overcrowding is the part that is irrelevant to humans ( although jails do seem to 'encourage' homosexual behavior, but that is probably attributed to other reasons ). But as he mentions, stress can be caused by a multitude of factors, and that may be relevant.