27 September 2007

مصر أم الدنيا

first published locally 26/9/07
The title of this post is a proverb or expression that appears to have been in colloquial usage and in popoular media for at least the latter half of the twentieth century. it means egypt is mother of the world. In the 1990s, reading some speculations by genetic scientists has provided added meaning to that phrase.

Some sort of genetic information analysis which I should hopefully re-look up and cite sometime later indicates that the current "stock" of humans, get this,
a. belongs to the same stock
b. seems to descend from a group of about 500 000 people somewhere in africa
some two or few decades of millenia ago, iirc, about 100 0000 years ago.

I don't recall the rationale behind these conclusions, which by themselves beg substantiation and elaboration.

Current paleontologic thinking also supports the idea that humans originating in africa, fanned out to the rest of the world. So the geneticists' "stock" eventually migrated out of africa onto the fertile crescent then the autral asian coasts , turkey minor, and beyond to asia and europe. Apparently historical evidence shows that the former were the earliest routes taken by the african migrants.

If this were so, then considering the routes out of africa, the northeast coast does seem to be the most likely route. Assuming that sea crossing was for long preceded by sailing along coastlines, then one supposes the way out of africa, either by sea or by land was indeed the egyptian realm, comprising both the coasts of sinai , opposite which the asian coast is visible to the naked eye,
as well as the land route across north sinai .

On the way those migrating africans would have followed not only the eastern african coast, but the much more likely route of the very long river Nile, which finds it sources deep in the center , in kenya.

Those migrating africans would have thus interacted with egyptian society, and some may have settled in it and therefore contributed to it. Perhaps also the sedentary egyptian population contributed also to the outward asia-ward migration.
Being a bottleneck of sort to early or first human migration out of africa, the phrase opening this post takes on a new sheen of credibility or possibility that egypt is indeed (figuratively speaking) a mother of the world.

Some problems arise however.

Was that out-of-africa migration a wave, a series of waves (how long were intervals?) or in continuous fluctuating streams or trickle of human movement?

But why then do traces of the oldest civilisation in egypt date back only about six millenia, and not as far back as true settlement which must have somewhere near or at least halfway to those 100 000 years ago.

The small size of the population at an early age, would not account for a huge migration. Supposing a slowly growing group of 500,000 humans began trans continental movement, it would have or must have amounted to a trickle if stretched across a long period of time.

How does this out-of-africa theory tally with the earliest accounts of population in various regions around the world? What constraints would the earliest available population estimates in addition to proposed population growth rates preceded those estimates, put on the sizes and destination of out-of-africa migrations supposing they began about 100,000 years ago ? Can such consideration hint at other ages for out-of-africa migration?

The out-of-africa theory is not quite aligned with religious cosmogonic accounts (let alone other mythological (or defunct religious) ones). I'm almost certain hindu traditions place humanity's beginnings in the subcontinent or near it.

The abrahamic traditions seem to point a fertile crescent, levantine or rather mesopotamian patrimony to the major peoples of the region, including the "founders" of nations , viz. the hamitic - like egypt, libya and punt - and the semitic nations. On the other hand, the latter or modern abrahamic tradition does not address the origin of all nations (except through adam and some of his progeny) and thus it does not claim an anthropogenesis for all nations, except in the person of adam and thereafter limits its scope to the hamito-semitic nations.

So in this sense at least the abrahamics are not necessarily in direct conflict with the geneticists' out-of-africa thesis, except on matters of evolutionary speciation of humans, aka "homo sapiens sapiens" to the geneticists.

###

Updates to this post:
paleohistory dept.: aegypten, muter der welt,
egypt-populated-between-130-and-50-thousand-yrs

cf. also this graph to illustrate DNA haplogroup or haplotype divergence,
https://flic.kr/p/pKETLi , published 21.x.xiv.

Update:
This article in Archaeology magazine seems to support the "out of Egypt" hypothesis,






... Read more

23 September 2007

Visiting the animals at the zoo

I could watch dozens of hours of David Attenborough documentaries sampling pictures of hundreds of fascinating nothing short of the psychedelic creatures that populate or once populated our big blue marble. it would be nothing however like walking up to the animals and see them live, up close, being in their presence.

Being close to those sad majestic odes to beauty and perfection, to their innocence, their beauty their very unhuman shapes sizes colors and demeanour is an experience of mystical proportions to those who can appreciate it, even at a sad place like the zoo.

Exchanging looks with a giraffe, or a llama or dromadary; watching ruminates approach the fence in expectation of a snack; watch parakeets talk among themselves, watching a parrot with fanstastic plummage yawn are all the stuff of fantasy and dreams.

At the zoo, especially in my nook of the woods, however there are other distressing scenes. There was a lion crying, (crying if he is anything like my cat when he cries) imprisoned and pacing in his outer cage to entertain by his mere presence people under the blare of loudspeakers pouring the most obnoxious popular music from the vendors kiosks 5 meters from the fence. This was one of my saddest moments at the zoo.

It is unfortunate this contrast between the glorious feelings I get from being in proximity to such life forms and the inevitable sadness that attends one's entry into any zoo. The story of kidnap and captivity and then being kept for life in poor and highly abusive conditions.

It would be nice to take kids up close to the animals , in the safety afforded by the zoo. But what of the moral responsibility and inescapable guilt and sadness?

I would think of it like taking them to a very special shrine, but in a very dilapidated area. I still think the trip to the zoo is worth it.

I find wonder in the height of the giraffe, the intricate musculature of the dromadary, who ironically approaches in resemblance the computer-generated movies of dinosaurs, in the patient resignation of the pelicans in the searching gaze of a llama or a peacock, or the familial atmosphere in a parakeet house.

Wonder like that to be found when one sits under a few trees, and looks up at the canopy of branches and leaves above, long enough to weep at their beauty, their gentle but unremitting complexity, at the subtlety of their creator. ... Read more

15 September 2007

Searching non .edu web resources

The following are tips for searching academic web resources (web, ie, available to the www) at academic institutions with tld other than "edu" which is used widely and almost exclusively only in the US , which limits search scope.

Some web engines provide syntax to restrict a web search to a specific class of sites.
For instance, the query "quantum +site:.org" for the google search engine will restrict search results to only sites that have a domain address ending in .org. The + signs means that the site criterion is required. Without it, results matching the site: criterion will be given higher ranking in the results set, but the set may also include non-matching results.

Other search engines have different names for the site criterion.
yahoo
altavista "host:"
webcrawler
google "site:"

Restricting the search to just universities omits a lot of research centers that would have .org domains (TLD's). But it is a good first step in focusing a web search on academic resources.

The most famous academic top-level domain is .edu . Unfortunately most sites with domains ending in .edu are american universities. So a google search query like "your search terms +site:.edu" will limit the result set to only academic resources in the US.

To expand the result set to other parts of the world, we first identify the domain naming patterns corresponding to a given country's universities, then we use that in the site criterion.

For Belgium, Japan and the UK, academic website domains end in an ".ac" followed by the country top-level domain, "*.ac.be", "*.ac.jp" and "*.ac.uk" respectively.

A web search query to cover these three countries would include the criterion, "site:.ac.*"

In Germany, university usually have the domain name prefixed with "uni-*.de". So a query might look like "host:*.uni-*.de".

Other countries, like argentina, use the top-level "*.edu." where country-tld is the country top-level domain. To search results in all countries that use this convention, use "site:.edu.*" .

Generally, if curious about the information from a given country, run a search for its universities and see how the domain is formed, then search for that pattern (the top parts of the domain).
... Read more

01 September 2007

can the UML be testable?

Recently i read someone promoting their own software modeling framework on some website. In explaining the advantages of his own system he remarked that UML "failed" because it was not testable or verifiable. The writer , however, is wrong in this assertion. I believe that the UML is testable and verifiable because (and assuming) it is directly mappable to source code, which is at least testable to the extent of the system requirements.

Now the idea of testability and verifiability is very important. and indeed these are two important criteria for well-designed software.

In a more general sense, when speaking of models in science, a crucial step in developing them is testing them, and their verifiability is also crucial in their acceptance and adoption.

So what about The UML? It is such a handy tool of design, it has become sort of the autoCAD or the HDL but for software instead of civil engineering or microprocessor design.

The UML to software is actually much more than what AutoCAD is to civic or mechanical engineering or HDL for chip design.

the UML is directly mappable to software, which can then be tested.

Whether the UML without code generation is itself testable might merit a web search. ... Read more