studiot

I don't know if this was a reference to my comments but I note that Switzerland was nearly the last country in Europe to give the vote to women (1971). But for @Peterkin's benfit my comments were really limited to this forum. How many women have posted an opinion in this thread ? On the choice of emission figures for Sweden and Switzerland v Canada and Australia, I view the counting methods with grave suspicion. How many 2000 mile train or road train journeys can you make in the former pair ? Both Canada and Australia are large producers and exporters of raw materials and foodstuffs. Who attracts the emissions of the tansport to other continents ? Both Sweden and Switzerland (couldn't you have chosen countries with short names ?) have extensive local hydro schemes, but little or no oil or coal reserves of their own. The movement of How would you power mass movement of goods to the rest of the world on the Australian or Canadian scale ? Norway would make a better example but it is above the World average at 6.7. However the story of Norwegian use of their massive oil reserves starkly contrasts with the UK at 14.7. They have made a so much better fist of it.

At what point did the chemical precursors of life combine to from something 'alive' and did that something respire ? This was something I meant for Roman to find out for himself, but have a look at this: The very recent discovery of anerobic bacteria in deep sea hydrothermal vents suggests possible alternative mechanisms for the beginning of life. https://pubmed.ncbi.nlm.nih.gov/16346061/

Well look further and deeper.

Who benefits most from this failure to address population issues, Men or Women ?

Watching last week's repair shop included a fascinating repair to a dented bugle. The repairer slid a cylindrical hardwood plug into the tube, followed by a metal weight about 15-20mm diameter by 15-20mm length. Then he shook the instrument up and down causing the weight to bounce up and down on the wooden plug, driving it through the flattened section of the air tube. This process took several hours, clearing the dents in the process. A fine example of the power of a steady small tap tap tap. As to the Repair Shop itself, I've noticed that in more recent episodes there are longer and better explanations of the whys and wherefores of what they are doing. Has anyone else noticed this ?

Now that we are passed the dreaded 1st, Does anyone remember any good pranks ? I remember when I was in a student flat in college a prank played upon one other student. In the middle of the appropriate night we all got up except Jack , got dressed and busied about making breakfast noises. "Hurry up Jack, or you will be late for lectures." "Didn't you hear the new?, there is a total eclipse this morning, that's why it is dark" One by one we left for our appointed lectures and hid around the corner. Sure enough afte a couple of minutes Jack emerged and set off for the college campus about 1.5 miles away. He didn't twig till he got there alone.

Yes that's exactly what made me suspicious (of them not you) because that I the waywe used to introduce an AF joke when I was at school. Yes exactly. The end of humanity a la Skynet or the end of chatbots or ....? +1

Nothing to do with me, but yesterday was April Fool's Day and I did not know whether to believe the article or not. Note the article linked to was also dated 1 April. I am also suprised or curious why so few members are interested in this topic and also why nobody has asked the obvious question since the title is ambiguous.

Depends what you mean. Biological agents are now recognised as being responsible for geological changes in the Earth's history. But please remember that Roman posted this in homework help so we cannot do his project for him. @RomanRodinskiy You should research The great oxygenation event cyanobacteria stromatolites Here is a history of the atmousphere from Wikipedia It divides history into 5 stages and I asked if you are interested in stage 5 where the sort of organised multicellular life we know occured. Note the great oxygenation event occured ab little over 2 billionyears ago. This might provide a good framework for your project.

I guess you are asking about evidence for the origin of life ? This is difficult and complicated because when life started on Earth neither the ocean nor the atmousphere consisted of anything like the current composition. The original lifeforms changed both of these, introducing oxygen into the atmousphere (it didn't start of with any). This period started about 3.5 billion years ago and took 2.5 to 3 billion years and there were few lifeforms and things changed very slowly. Once the compositions had settled down to near current conditions geological evidence points to an 'explosion of lifeforms' (Sedgewick) about 0.5 billion years ago., in the Cambrian period. I think perhaps the life you are thinking of started at this time and led to the sequence of evolutionary development that results in the evidence for oxygen based life. Here is a summary of the biochemical evidence that supports the idea of seawaterborne development from The Nature of Biochemistry - Ernest Baldwin - Cambridge University Press. It is very persuasive to note that so many disparate land and marine creatures analyse down match to the chemical distribution of ions in seawater.

CHATGPT banned in Italy perhaps others to follow.

If you are not going to 'restore' - dry - the pink gel, what is the point of keeping them ? Once saturated they no longer protect your valuables.

As I said, I haven't tried a microwave but the net say it can be done but some sites are too gung ho for my taste. Here is a measured warning plus useful instructions. https://www.reddit.com/r/3Dprinting/comments/bwbvri/protip_microwave_your_silicadesiccant_to_dry_it/ This guy spread out the gel as I suggested before. https://homeguides.sfgate.com/dry-silica-gel-microwave-25024.html So I suppose it depends upon quantity. The second guy used bigger amounts. I remember changing the dessicant by the barrel load inside steel box girder bridges. One worry I have with a microwave is that it takes time to properly dry out. As soon as you remove the gel from the microwave it starts reabsorbing moisture from the atmousphere. A conventional oven will still be dry inside as the gel is allowed to cool.

I have no knowledge of using a microwave to dry out spent silica gel. We always used to heat it in a tray in a moderate dry (not gas) oven at 75 - 150 degreesC for a few hours. Do not let it get too hot or it will loose its hygroscopic (water absorbing) properties. Is anyone sure microwaving actually works ? Personally I would be worried about local overheating and degradation of the gel.

Like so many classification schemes, phenomenological v noumenoligical is very limited and incomplete. Yes I agree the idea is good and can serve a useful purpose, but I still consider that the plain old English concrete v abstract nouns covers more situations, which do not require the causal connection of ph v nou. For instance I have just used a couple of abstact nouns (classification) schemes and ideas. Is there a causal relationship between the idea and its realisation ?

Thanks for the reply and links. I thought you might be interested. I was wondering what sort of printable material would withstand rocket launch and propulsion techniques. PS I did my first bit of plastic welding repair recently, to a broken laundry stand boss. Was not so successful with my second repair attempt to a broken freezer handle.

Yup MigL has said it simply Nothing wakes up one morning and decide I am gong to 'evolve'. There is a whole formal theory of rock structure evolution. I don't agree. The Romans had piped fresh water and centrally heated buildings. 2,000 years later do we have better?

@Sensei get your 3D printer out and see what you can do. This rocket nearly made it. https://www.bbc.co.uk/news/science-environment-64893578

So what do you mean by evolution ? Do you mean change? That is a perfectly acceptable usage. Rocks 'evolve'.

Not too sure about any of this. The tread is entitled Human Evolution. Isn't this a strange idea ? After all if we evolved would we still be human ? I suppose it depends what you mean by 'evolution' ?

Actually the OP described a function since it used a letter for a variable, not a specific number. It is important to distinguish between a function and the value of that function at a specific point. A square root of a number is another number, a square root of a function is another function. So a square root of 4 is 2 and another square root is -2, all of which are numbers. Folks also often make this mistake with the differential calculus, where the derived function (the derivative) has, possibly different, values at every point where the original function is differentiable.

I agree wholeheartedly that deadly sins numbers 2 (greed) and gluttony (6) are between them the biggest obstacle to be overcome. +1 As regards the second part of you statement I think the size of the world population makes little if any difference to this stark fact. Have you come across the doctrines of Schumaker (Small is Beautiful) and Allaby (Limits to Growth) ? https://en.wikipedia.org/wiki/Small_Is_Beautiful http://www.herinst.org/envcontext/limits/writings/ecologist.html They are very attractive to well balanced, well motivated human beings. The only real drawbacks to these doctrines is that thay have no answer to threats from so called 'Military-Industrial' societies.

Your mechanical base variables can't be for instance time, velocity and acceleration. There would be one 'missing' variable in your set of 3. In fluid mechanics force, length and time are often used instead of mass, length and time.

I really don't see why either of these wild assed guesses (the other being that nonsence about gravity and heat) have not been move to speculations where they undoubtedly belong. They are most certainly not in accord with Physics theory, modern or classical. What do you mean by an electrical circuit ? Do you mean a complete loop or the more colloquial use of the word circuit as an assembly of electrical components ? Whilst it is conceivable that there could be an electron beam connection between the Earth and the Moon - like a giant cathode ray tube - I think that to well beyond our present technology. There is no natural process to achieve the same effect available, although we do receive natural charged particles from the Sun.

I know you can write more than repeating you first very short question. This one sided communication is becoming very tiresome.