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  Surely Martian Haversian canals in king's new clothes.         


Author: Lin Liangtai
Date: Aug 4, 2008 23:42

Surely Martian Haversian canals in king's new clothes.
The following is a photomicrograph taken by Phoenix on Mars. It is
labeled with four Haversian canals of Mars origin
http://www.wretch.cc/album/show.php?i=lin440315&b=20&f=1555215742&p=73

Source of above photo:
http://phoenix.lpl.arizona.edu/images.php?gID=17484&cID=196
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  News: Study uses genetic evidence to trace ancient African migration         


Author: Robert Karl Stonjek
Date: Aug 4, 2008 20:23

Study uses genetic evidence to trace ancient African migration

Stanford University researchers peering at history's footprints on human DNA have found new evidence for how prehistoric people shared knowledge that advanced civilization.

Using a genetic technique pioneered at Stanford, the team found that animal-herding methods arrived in southern Africa 2,000 years ago on a wave of human migration, rather than by movement of ideas between neighbors. The findings shed light on how early cultures interacted with each other and how societies learned to adopt advances.

"There's a tradition in archaeology of saying people don't move very much; they just transfer ideas through space," said Joanna Mountain, PhD, consulting assistant professor of anthropology. Mountain and Peter Underhill, PhD, senior research scientist in genetics at Stanford's School of Medicine, were the study's senior authors. Their findings will appear in the Aug. 5 advance online edition of Proceedings of the National Academy of Science.

"We know that humans had to migrate at some point in their history, but we also know humans tend to stay put once they get someplace," Underhill said.

Instead of using archaeological evidence alone to guess whether people migrated, "all of a sudden, with genetics, you can actually address that question," Mountain said.

The researchers tracked genetic variation on the Y chromosome, the sex chromosome passed from father to son that encodes maleness, using a technique now widely used that was developed in the early 1990s by Underhill and colleagues in the lab of Luigi Cavalli-Sforza, professor emeritus of genetics. The method has given scientists a powerful window into ancient human migrations and prehistoric cultural shifts. The technique has also been adopted by some commercial genealogy services that offer Y-chromosome testing to the public.

Previous research suggested that prehistoric people in eastern and southern Africa had little contact, with only two known migrations between the regions about 30,000 and 1,500 years ago. After Bantu-language speakers migrated from eastern to southern Africa 1,500 years ago, agriculture took off in southern Africa. But the timing of the Bantu migration didn't quite match the 2,000-year-old anthropological evidence for the first sheep and cattle herds in southern Africa, so anthropologists were unsure whether the region's agricultural knowledge came from a bow-wave of ideas that spread in front of the migrating Bantu, or whether a separate migration brought the first herders.

"Africa has the most genetic diversity in the world, but it is one of the least-studied places," said Brenna Henn, a doctoral student in anthropology who was the study's lead author. "I've always felt like there were a lot of stories there that nobody's had the time or interest to look into."

The Stanford scientists picked the Y sex chromosome to examine for clues to migration because it changes very little from one generation to the next. Autosomes - the non-sex chromosomes - come in pairs...
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  News: Rock art marks transformations in traditional Peruvian societies         


Author: Robert Karl Stonjek
Date: Aug 4, 2008 20:12

Rock art marks transformations in traditional Peruvian societies

Peru is one of the Latin American countries, like Argentina and Brazil, where rock art is thought to have developed throughout a period stretching from 10,000 BC to 1500 AD. The wealth and diversity of the series of pictorial representations made during this period are now beginning to be appreciated by archaeologists. Recent investigations by an IRD researcher has given insights into the daily lives of human communities who lived in the coastal and mountainous areas of Peru during that era.

Most rock paintings and rock carvings or petroglyphs were created by ancient and prehistoric societies. Archaeologists have long used them to gain clues to the way of life of such peoples. Certain rock frescos ? such as the renowned Lascaux and Chauvet cave paintings or the petroglyphs of Scandinavia and North America ? have already yielded substantial information on our ancestors' daily lives.

However, for other regions of the world like Latin America studies are still fragmentary. In Peru, where many sites have already been located, mystery still cloaks the signification and role of these concentrations of cave paintings and petroglyphs. One of these sites, Toro Muerto, in the South of the country, contains over 4000 carved blocks scattered over several dozen hectares.

Discoveries made in different areas of the country over recent years by Peruvian and international researchers are keys to improved understanding of the meaning behind these artistic representations which were realized over a long period from 10 000 BP to the arrival of the first Spanish Conquistadors in the XVIth Century, or even beyond that time, as in the Cuzco area. Analysis of the distribution and characteristics of these sites brought out a distinction between the art produced in the coastal valleys from that of the Andean Cordillera uplands. The extensive sites with rocks carved in the open air are concentrated mainly on the Pacific facing slopes, whereas the scenes painted in caves or under shelters predominate in the high regions and on the Amazon side.

These preferences as to the supports and techniques used reflect associated ritual practices which are probably rather different. Study of the oldest rock paintings and their dating by indirect methods (carbon 14 dating of remains of in situ burnt charcoal) showed them to be the work of hunter-gatherers who occupied the region between 7000 and 3000 BC The motifs are small and most often painted in red. They depict hunting scenes involving wild camelid species, such as the guanaco, and also human-like silhouettes. The latter are portrayed with animal-like rather than human faces. Such figures are usually armed with sticks, bows or assegais and sometimes carry nets.

The most ancient sites show a predominance of naturalistic representations of dead or wounded animals. However, a second set dated at 4000 to 5000 years BC eulogizes fertility. This time the images are large, drawn with the abdomen enormously swollen, sometimes containing a foetus. This stylistic development, which seems to coincide with the beginnings of animal husbandry in the high upland regions of Peru, appear to symbolize the emergence of pastoralism and the change in man-animal relationships that came along with this practice.

These research studies also brought into relief periods that were quite distinct in terms of stylistic evolution of carved figures. Whereas the most ancient motifs, associated with the rise of the first great Andean civilizations (2500-300 BC) essentially reproduced complex figures bearing high symbolic and spiritual content, depicting mythical, often monster-like, animals and supernatural beings, the later carvings characteristically appear in abundance and testify to a simplification of morphological features. The simplicity and relative abundance of these petroglyphs, which depict animals of the local fauna and also scenes from daily life, suggest a degree of generalization of rock carving practices to further sections of the society.

The largest sites dating from this era, which contain several hundred carved rocks with dozens of motifs, probably played a significant role in societies' cultural and social life, both at local and regional level. Their location, and some of the rituals that took place, may have been linked to areas of production and trade routes of prized commodities such as coca or salt. Other, geographical, factors like the confluence of two rivers or the proximity to communication routes also appear to have significantly influenced the context and purpose of these artistic representations.

A more extensive study of these archaeological sites, still strongly subjected to vandalism and erosion, is paramount. These vestiges testify to the ideological and social changes that occurred over a period of almost 8000 years, and can further understanding of the way of life and beliefs of peoples who were among the New World's first settlers.

Source: Institut de Recherche Pour le DƩveloppement
http://www.physorg.com/news137076725.html

--
Posted by
Robert Karl Stonjek

Rock art marks transformations in traditional
Peruvian societies
Peru is one of the Latin American
countries, like Argentina and Brazil, where rock art is thought to have
developed throughout a period...
Show full article (10.18Kb)
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  Re: semi-aquatic mountain-beavers         


Author: Rick Wagler
Date: Aug 4, 2008 13:50

"Marc Verhaegen" wrote in message
news:C4BB25B1.13566%%m_verhaegen@skynet.be...
> http://cameratrapcodger.blogspot.com/2008/07/seldom-seen-showtl-or-aplodon.h
> tml
>
> "like beavers they are excellent swimmers and waterway engineers"
>
> http://cameratrapcodger.blogspot.com/2007/07/hark-mountain-beaver.html
>
> "mountain beavers are unable to produce a concentrated urine by resorbing
> water, because their kidneys lack the loops of Henle which perform this
> function. They need plenty of free water and succulent vegetation to
> survive."
>
> Thanks, DD.
>
For mountain beavers see
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  Aren't these organics dangling on Mars?         


Author: Lin Liangtai
Date: Aug 4, 2008 05:17

Aren't these organics dangling on Mars?

They may be invisible to the babelling ivory tower:
http://www.wretch.cc/album/show.php?i=lin440315&b=20&f=1555209949&p=74
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