Genady

Merge?

Here is a true story, from my memory of about 25 years ago. I worked then in Risk Dept of a big international securities company with NY headquarters in WFC, next to the Wall Street. The risk calculations kept showing that a risk of some investment that the management wanted to make, was unacceptably high. But the management wanted it really hard. So we, the financial and the system analysts of the Risk Dept, have spent hours adjusting parameters until the risk came down just below the threshold for the management to justify the deal. The deal went through. A few weeks later, the crash of 1998 happened. The company lost a lot of money. The management was fired. The analysts got big bonuses anyway.

Dirac did, 90 years ago: Dirac sea - Wikipedia

Where I live, right now the sky is clear and the Moon is a beautiful dark orange ball! About the max of the total eclipse.

Wait for peer reviews?

One principle that forbids detection, I think, is the uncertainty principle. The detection time needs to be longer than the wave period (or half, to the order of magnitude). I wonder if there are other fundamental limits.

In other words, what is the longest possible wavelength which is physically detectable, in principle? Or, the slowest frequency?

This is correct. It reminded me of a question from the astronomy class. Sorry, completely unrelated to the OP: During a Solar eclipse, the Moon casts a shadow onto the Earth. Which way is this shadow moving during the eclipse, East to West or West to East?

So, up until about day six the plants used nutrients and organic matter stored in the seeds, and used the soil just to hold to something. After that, the plants needed more from the substrate and then "discovered" that something is missing. I'd guess that botanists know what is missing. I read this news and couldn't understand what was so astonishing, what did they expect, what new knowledge have they obtained...

A direct effect of oceans on the underwater landscape is making rocks lighter and thus the underwater mountains taller, canyons deeper, and walls steeper then those above water.

I am missing something here. Since you are not a biologist, what is importance of a name you like being "official"? I mean, just name it whatever you want, what else is involved?

In some other report I read that gas orbits the BH in minutes, much shorter than the observation time used to create this image. In any case, I understand that what we see is not the accretion disk, but its image distorted by the BH. E.g. the source of the bright spots maybe behind the BH and we see it three times as its light is lensed by the BH.

Do they need to remove the effect?

I don't know what it has to do with consciousness: Top Tips to Stop Birds From Attacking Their Reflections | Lyric Wild Bird Food (lyricbirdfood.com)

The jet should be perpendicular to the accretion disk plane, I think. I suppose they know that plane now. Maybe.

WATCH LIVE: Astronomers reveal ‘groundbreaking’ findings about the Milky Way | PBS NewsHour

In fact, it was a tongue in cheek comment of mine.

"Until May 12 rolls around, we won't know with any certainty what exactly it is that the NSF is going to announce." The US National Science Foundation Has 'Groundbreaking' News About The Milky Way (slashgear.com)

The first thing that has attracted my attention to this newly posted study was the long list of authors. 165 authors! From 103 different institutions! From dozens different countries! When you see what they did, you understand, why it is so. Big job. Here is quite detailed summary: The transitions from foraging to farming and later to pastoralism in Stone Age Eurasia (c. 11- 3 thousand years before present, BP) represent some of the most dramatic lifestyle changes in human evolution. We sequenced 317 genomes of primarily Mesolithic and Neolithic individuals from across Eurasia combined with radiocarbon dates, stable isotope data, and pollen records. Genome imputation and co-analysis with previously published shotgun sequencing data resulted in >1600 complete ancient genome sequences offering fine-grained resolution into the Stone Age populations. We observe that: 1) Hunter-gatherer groups were more genetically diverse than previously known, and deeply divergent between western and eastern Eurasia. 2) We identify hitherto genetically undescribed hunter-gatherers from the Middle Don region that contributed ancestry to the later Yamnaya steppe pastoralists; 3) The genetic impact of the Neolithic transition was highly distinct, east and west of a boundary zone extending from the Black Sea to the Baltic. Large-scale shifts in genetic ancestry occurred to the west of this “Great Divide”, including an almost complete replacement of hunter-gatherers in Denmark, while no substantial ancestry shifts took place during the same period to the east. This difference is also reflected in genetic relatedness within the populations, decreasing substantially in the west but not in the east where it remained high until c. 4,000 BP; 4) The second major genetic transformation around 5,000 BP happened at a much faster pace with Steppe-related ancestry reaching most parts of Europe within 1,000- years. Local Neolithic farmers admixed with incoming pastoralists in eastern, western, and southern Europe whereas Scandinavia experienced another near-complete population replacement. Similar dramatic turnover-patterns are evident in western Siberia; 5) Extensive regional differences in the ancestry components involved in these early events remain visible to this day, even within countries. Neolithic farmer ancestry is highest in southern and eastern England while Steppe-related ancestry is highest in the Celtic populations of Scotland, Wales, and Cornwall (this research has been conducted using the UK Biobank resource); 6) Shifts in diet, lifestyle and environment introduced new selection pressures involving at least 21 genomic regions. Most such variants were not universally selected across populations but were only advantageous in particular ancestral backgrounds. Contrary to previous claims, we find that selection on the FADS regions, associated with fatty acid metabolism, began before the Neolithisation of Europe. Similarly, the lactase persistence allele started increasing in frequency before the expansion of Steppe-related groups into Europe and has continued to increase up to the present. Along the genetic cline separating Mesolithic hunter-gatherers from Neolithic farmers, we find significant correlations with trait associations related to skin disorders, diet and lifestyle and mental health status, suggesting marked phenotypic differences between these groups with very different lifestyles. This work provides new insights into major transformations in recent human evolution, elucidating the complex interplay between selection and admixture that shaped patterns of genetic variation in modern populations. Population Genomics of Stone Age Eurasia (biorxiv.org)

I'm just kurious (pan intended). What would stop you from naming them?

I think it does. It will be very confusing to discover inconsistencies between your memories and the world.

Hmmm... My experience, both as a child and as a parent is quite different.

Sounds like a fairy tale, too: a little known horse from a small stable, entered the race at the last minute because some other horse was disqualified - won the biggest upset since 1918.

It was beautiful. All other horses suddenly look so slow...

You got four equations with four unknowns. Try to substitute one into another to eliminate the unknowns one by one. BTW, notice that your x, y, z in f() and in g() are not exactly the same. You'll need to fix this mistake to get the answer correctly.