Neale Donald Walsch

Version Française
« Conversations avec Dieu — Le film » raconte l’histoire de l’auteur Neale Donald Walsch, qui, après un divorce, sans emploi et sans abri est devenu un messager spirituel et l’auteur internationalement reconnu sur la liste des meilleurs vendeurs du New York Times avec la série «Conversations avec Dieu». Film basé sur les livres de Neale Donald Walsch.

Version Française
« Conversations avec Dieu — Le film » raconte l’histoire de l’auteur Neale Donald Walsch, qui, après un divorce, sans emploi et sans abri est devenu un messager spirituel et l’auteur internationalement reconnu sur la liste des meilleurs vendeurs du New York Times avec la série «Conversations avec Dieu». Film basé sur les livres de Neale Donald Walsch.

Neale Donald Walsch

Version Française« Conversations avec Dieu — Le film » raconte l’histoire de l’auteur Neale Donald Walsch, qui, après un divorce, sans emploi et sans abri est devenu un messager spirituel et l’auteur internationalement reconnu sur la liste des mei…

Version Française
« Conversations avec Dieu — Le film » raconte l’histoire de l’auteur Neale Donald Walsch, qui, après un divorce, sans emploi et sans abri est devenu un messager spirituel et l’auteur internationalement reconnu sur la liste des meilleurs vendeurs du New York Times avec la série «Conversations avec Dieu». Film basé sur les livres de Neale Donald Walsch.

common ancestry explains the DNA that Eurasians share with Neanderthals

New research raises questions about the theory that modern humans and Neanderthals at some point interbred, known as hybridisation. The findings of a study by researchers at the University of Cambridge suggests that common ancestry, not hybridisation, better explains the … Continue reading

New research raises questions about the theory that modern humans and Neanderthals at some point interbred, known as hybridisation. The findings of a study by researchers at the University of Cambridge suggests that common ancestry, not hybridisation, better explains the average 1-4 per cent DNA that those of European and Asian descent (Eurasians) share with Neanderthals. It was published today, 13 August, in the journal PNAS.

In the last two years, a number of studies have suggested that modern humans and Neanderthals had at some point interbred. Genetic evidence shows that on average Eurasians and Neanderthals share between 1-4 per cent of their DNA. In contrast, Africans have almost none of the Neanderthal genome. The previous studies concluded that these differences could be explained by hybridisation which occurred as modern humans exited Africa and bred with the Neanderthals who already inhabited Europe.

However, a new study funded by the BBSRC and the Leverhulme Trust has provided an alternative explanation for the genetic similarities. The scientists found that common ancestry, without any hybridisation, explains the genetic similarities between Neanderthals and modern humans. In other words, the DNA that Neanderthal and modern humans share can all be attributed to their common origin, without any recent influx of Neanderthal DNA into modern humans.

Dr Andrea Manica, from the University of Cambridge, who led the study said: “Our work shows clearly that the patterns currently seen in the Neanderthal genome are not exceptional, and are in line with our expectations of what we would see without hybridisation. So, if any hybridisation happened – it’s difficult to conclusively prove it never happened – then it would have been minimal and much less than what people are claiming now.”

Neanderthals and modern humans once shared a common ancestor who is thought to have spanned Africa and Europe about half a million years ago. Just as there are very different populations across Europe today, populations of that common ancestor would not have been completely mixed across continents, but rather closer populations would have been more genetically similar to each other than populations further apart. (There is extensive genetic and archaeological evidence that population in Africa were ‘structured’; in other words, different populations in Africa only had limited exchange through migration, allowing them to remain distinct from each other both in terms of genetics and morphology.)

Then, about 350-300 thousand years ago, the European range and the African range became separated. The European range evolved into Neanderthal, the African range eventually turned into modern humans. However, because the populations within each continent were not freely mixing, the DNA of the modern human population in Africa that were ancestrally closer to Europe would have retained more of the ancestral DNA (specifically, genetic variants) that is also shared with Neanderthals.

On this basis, the scientists created a model to determine whether the differences in genetic similarities with Neanderthal among modern human populations, which had been attributed to hybridisation, could be down to the proximity of modern humans in northern Africa (who would have later gone on to populate Europe) to Neanderthals.

By examining the different genetic makeup among modern human populations, the scientists’ model was able to infer how much genetic similarity there would have been between distinct populations within a continent. The researchers then simulated a large number of populations representing Africa and Eurasia over the last half a million years, and estimated how much similarity would be expected between a random Neanderthal individual and modern humans in Africa and Eurasia.

The scientists concluded that when modern humans expanded out of Africa 60-70K years ago, they would have brought out that additional genetic similarity with them, making Europeans and Asians more similar to Neanderthals than Africans are on average – undermining the theory that hybridization, and not common ancestry, explained these differences.

Dr Manica added: “Thus, based on common ancestry and geographic differences among populations within each continent, we would predict out of Africa populations to be more similar to Neanderthals than their African counterparts – exactly the patterns that were observed when the Neanderthal genome was sequenced; but this pattern was attributed to hybridisation. Hopefully, everyone will become more cautious before invoking hybridisation, and start taking into account that ancient populations differed from each other probably as much as modern populations do.”

the geography of physics

Sapping Attention: The Wide World of Physics: I’ve been thinking more than usual lately about spatially representing the data in the various Bookworm browsers. So in this post, I want …

Sapping Attention: The Wide World of Physics: I’ve been thinking more than usual lately about spatially representing the data in the various Bookworm browsers. So in this post, I want …

Self Pity

I never saw a wild thing
sorry for itself.
A small bird will drop frozen dead from a bough
without ever having felt sorry for itself
D.H. Lawrence

I never saw a wild thing
sorry for itself.
A small bird will drop frozen dead from a bough
without ever having felt sorry for itself

D.H. Lawrence

The highest possible resolution images

Colour printing reaches its ultimate resolution

Images made up of metal-nanostructure pixels could be used for security or optical data storage.

Katherine Bourzac

12 August 2012

The highest possible resolution images — about 100,000 dots…

Colour printing reaches its ultimate resolution

Images made up of metal-nanostructure pixels could be used for security or optical data storage.

Katherine Bourzac

12 August 2012

The highest possible resolution images — about 100,000 dots per inch — have been achieved, and in full-colour, with a printing method that uses tiny pillars a few tens of nanometres tall. The method,

México en tus Sentidos

El video de promoción turística México en tus Sentidos, ganó el Grand Prix de Brasil considerado como el mejor trabajo a nivel internacional.

A través de un comunicado la Secretaría de Turismo informó que el reconocimiento se obtuvo en el Tour …

El video de promoción turística México en tus Sentidos, ganó el Grand Prix de Brasil considerado como el mejor trabajo a nivel internacional.

A través de un comunicado la Secretaría de Turismo informó que el reconocimiento se obtuvo en el Tour Film Brazil que se llevo a cabo el pasado 21 de mayo, que atrae a los mejores creativos de la industria turística e imágenes de los destinos turísticos de