Strange

11 minutes ago, michel123456 said:

Exactly.

However length contraction & time dilation go hand by hand, you cannot have the one without the other.

So I reiterate my question: what about time dilation when the observer sees a universe that as you states "will appear to be 11 metres long to the pilot in the direction of motion", but

"in a direction at right angles to this the universe will appear to extend to its usual limits, whatever they may be" ?

It is a rotation between the time dimension and one spatial dimension (the one corresponding to the direction of travel)

19 hours ago, StringJunky said:

If you start with 22000 genes, and in each generation backwards, it halves until you are left with one gene shared, your identifiable genetic relationship with that line ends. in about 14-15 generations. This is how I understood it but could be wrong. Assuming a gene is some indivisible unit of heredity.

Interesting way of looking at

10 minutes ago, Royston said:

Today I learned, after a seagull knocked some off my roof, that the humble Lichen is a composite organism. It is a symbiotic relationship between cyanobacteria and fungi. Nearly 6% of the Earth is covered in Lichen, which is testament to, if you get along, you'll be successful. 

https://en.wikipedia.org/wiki/Lichen

Some are symbiotes of three organisms: Cyanobacteria, fungus and yeast

https://science.sciencemag.org/content/353/6298/488

Today I learned that “lichen” is also the name of several (rather unpleasant) skin diseases 

19 minutes ago, gamer87 said:

adhesive glue this photos contains acid corrosive for electronics boards?

Does it.

You probably shouldn’t use it then

Maybe it is toxic, as well.

I think you should take them all to your local police station

30 minutes ago, gamer87 said:

more photos

Why? What is the point?

36 minutes ago, gamer87 said:

 

I could ask them but I don't know the name of this type of bag with glue and tag for me to research

You bought it from them so it must have a name, part number or order number

2 minutes ago, gamer87 said:

I don't have the manufacturer's contact number I bought from a dealer

That is why I said "supplier".

There is no point asking here. No one can tell you about an unknown adhesive from an unknown supplier made by an unknown manufacturer.

At least you could ask the supplier whether the bags and labels are suitable for your purpose. Or ask who the manufacturer is, then ask the manufacturer if they are suitable.

The amount of time you have spent on this forum asking people who cannot know, could have got you an answer by now.

11 hours ago, farsideofourmoon said:

Before you stuck your but into this discussion a few posters were trying to honestly discuss the energy potential of converting sewage treatment plants into self-sustaining facilities.

There was no discussion of that. It barely got a mention in your opening post.

Feel free to open a serious thread on the topic. But you might want to read up on some of the hundreds of projects doing this already, before posting.

Call me old fashioned, but I just think the combination of immature humour and ignorance is not the best possible start to a discussion of the science and technology involved.

42 minutes ago, Alex Caledin said:

Nature supports our childish game of assembling/disassembling things - so we are ever so easily jumping to the conclusion that everything is "made of" some elementary particles.

Why do you think this is “jumping to a conclusion” rather than, say, examining the evidence?

9 hours ago, gamer87 said:

 

is this glue from the bag and the label acidic?

How do you expect anyone to answer that. 

35 minutes ago, gamer87 said:

I am not able to perform this test

Of course you can. Buy some litmus paper. 

36 minutes ago, gamer87 said:

but use the same type of bag and label as those that come with aliexpress products

If you are worried about corrosion, you could try putting dessicant (SiO2) in the bag with product. 

But if you are using these bags and labels, maybe you should ask the supplier. No one here can answer. 

2 hours ago, michel123456 said:

And what about time dilation?

Time doesn't have a directional component

1 hour ago, gamer87 said:

what compound of this glue bag and glue label this photo?

How do you expect anyone to know that? There are thousands of adhesives in use.

Why do you want to know?

1 hour ago, StringJunky said:

I happened to read not long ago that ordinary plastic is permeable to gas, and electronics that need to be stored for any time gas-free are put in that metallized plastic stuff.

I am not surprised. (Certainly more plausible than the adhesive being a problem.)

6 minutes ago, gamer87 said:

the glue compound this bag and label is corrosive for metal and electronics board?

Why do you think that? It seems very unlikely. Most glues are not corrosive. They may contain water when newly applied, but that would soon dry out.

4 hours ago, King E said:

How will the molecules on the bottom escape as vapours?

To give an even simpler answer: they get to the surface and then escape! 

That may be too simple to be useful. But as you add heat from the bottom, it will cause convection which brings those molecules up to the surface. Also, as the fastest molecules at the surface escape, the average kinetic energy of the top layer decreases; in other words it cools and so will sink lower in the container.

23 minutes ago, John Cuthber said:

I'm not actually sure about that.
Would it need to be stronger than a stone arch?

If it is x times thicker it weighs x times more, but there's x times more stuff to hold it up.

That's a very good point. 

2 hours ago, John Cuthber said:

To be fair, while "zero" is the right answer, it's not obvious.

Fair. It should be well known; but it is an extremely surprising result.

4 hours ago, BorisBoris said:

What would be the gravity on the inner surface?

It would also be interesting to know what the strength of the material would need to be. Presumably, far beyond anything that exists in nature.

10 minutes ago, StringJunky said:

Locally it's pretty hardcore.. I read just yesterday, after Dounray reactor is dismantled, the land won't be usable for 300 years or so.

That wasn't a fusion reactor, though (which was what was being claimed).

26 minutes ago, joigus said:

I once learnt that in Wales there is a place which has one of the longest toponyms. There seems to be a Maori toponym that is longer.

How about a weekend in,

Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu?

If that's too much of a stretch, you can always stay at,

Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch

I'm sure those are sentences in disguise!

Not forgetting Chargoggagoggmanchauggagoggchaubunagungamaugg in the USA (although I think some extra syllables were added to that one).

And, apparently:

Quote

This name is often shortened as Llanfairpwll or Llanfair PG for brevity. This is the name of a large community of villages in Wales found on the Islands of Anglesey. Initially, this community was referred to as Llanfair Pwllgwyngyll before its name was changed in the 1860s for promotional purposes.

https://www.worldatlas.com/articles/the-10-longest-place-names-in-the-world.html

And the full version of Taumata translates as "the place where Tamatea, the man who had big knees, the climber of mountains, the slider, the land-swallower that traveled about, played the nose flute that he had to the loved ones" (ibid).

If we are getting poetic:

"A little learning is a dang'rous thing;

Drink deep, or taste not the Pierian spring:

There shallow draughts intoxicate the brain,

And drinking largely sobers us again.

1 hour ago, Markus Hanke said:

I have never heard of Octave, so not sure about this.

It is an open-source equivalent to Mathematica (and, presumably, similar to Maple): https://www.gnu.org/software/octave/ (I have only used it for some basic linear algebra when studying ML)

There is an online version: https://octave-online.net

Otherwise, I would think Wolfram Alpha may be the best bet

5 hours ago, Enthalpy said:

The polymer matrix is often polyurethane, which interferes with our hormone mechanisms.

Citation needed

5 hours ago, Enthalpy said:

Goods manufacturers use it as a cheap replacement and label it "leather" with absolutely no distinctive word nor label. Possibly, legislation allow that when the mass proportion exceeds 50%.

Citation needed 

5 hours ago, Enthalpy said:

It can also be other polymers, very often loaded with plasticizers to imitate leather's bendability, and these plasticizers use to be toxic and migrate out of the polymer over time.

Citation needed 

4 hours ago, Enthalpy said:

For an energy source as polluting as uranium fission

Citation needed

Have you looked to see if anything equivalent is available for Octave? (I am not very familiar with any of these packages, so I have no idea)

Also, there is a 15 day trial version of Maple (but maybe you have used that up already 🙂)

41 minutes ago, BorisBoris said:

What would be the gravity on the inner surface?

Zero, obviously.

Also, your link contains no evidence for the Earth being hollow. 

3 hours ago, Ghideon said:

Although in my limited knowledge of chemistry I did not think of that as a chemical reaction.

True

3 hours ago, Ghideon said:

Interesting. And in the context of OP question: What is the highest pressure "released" during a supernova explosion? Does that count as a "chemical reaction"?

Nuclear chemistry?