Necessity Is The Mother Of Invention

bob b

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"Evolution may sometimes happen so fast that it's hard to catch in action, a new study of Galápagos finches suggests.

Researchers from New Jersey's Princeton University have observed a species of finch in Ecuador's Galápagos Islands that evolved to have a smaller beak within a mere two decades.


Surprisingly, most of the shift happened within just one generation, the scientists say."

http://news.nationalgeographic.com/news/2006/07/060714-evolution.html
 

bob b

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"In one of the first systematic attempts to describe the differences between primates and other mammals, Thomas Huxley argued that the former are distinguished by virtue of their adaptation to arboreal life. Central to this arboreal life is the grasping hand. Indeed, the primate hand is so fundamental to how we define ourselves that some, including Friedrich Engels, have claimed that hand use (particularly with tools) was the driving force that gave rise to our sophisticated cognitive abilities. Though this idea is an overstatement, our hands do represent a masterpiece of Darwinian evolution; its elegant design is on a par with the eyes and ears."

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1Charles G. Gross and Asif A. Ghazanfar, “Neuroscience: A Mostly Sure-Footed Account of the Hand,” Science, 2 June 2006: Vol. 312. no. 5778, p. 1314, DOI: 10.1126/science.1125179.
 

Sealeaf

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The national geographic article is interesting, the Fox one is trash, even if it reports real events. I was appalled at the warping of the scientific point of view. The theory sounds pretty shaky too. Granted, the out of proportion fear, humans have of snakes and spiders might have an evolutionary basis. I have speculated that we might have gone through a swamp dewelling phase. This might explain our upright stance, to get higher in the water, our "shearwater" noses that permit diving, our furlessness, aguatic animals show a tendency to be hairless, and our fear of poisonous animals known to frequent swamps.

The Fox article seems to be reporting scientific speculation, such as I engaged in above. The NG article reports on actual science being painstakingly done. It shows one thing. Making up explanations is easy, Science is hard.
 

bob b

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Sealeaf said:
The national geographic article is interesting, the Fox one is trash, even if it reports real events. I was appalled at the warping of the scientific point of view. The theory sounds pretty shaky too. Granted, the out of proportion fear, humans have of snakes and spiders might have an evolutionary basis. I have speculated that we might have gone through a swamp dewelling phase. This might explain our upright stance, to get higher in the water, our "shearwater" noses that permit diving, our furlessness, aguatic animals show a tendency to be hairless, and our fear of poisonous animals known to frequent swamps.

Sounds like you would fit right into evolutionary "science".

The Fox article seems to be reporting scientific speculation, such as I engaged in above.

The FOX article stated that "Isbell's work is detailed in the July issue of the Journal of Human Evolution." Isn't that a peer-reviewed technical journal?

The NG article reports on actual science being painstakingly done. It shows one thing. Making up explanations is easy, Science is hard.

Sounds like evolutionary "science" is fun. Sort of like glorified science fiction.
 

bob b

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Sorry old Bean, the apes got there first by Roger Dobson

THE old ones really are the best. Evolutionary biologists have traced the origins of laughter back 4m years to pre-humans slipping and stumbling in their first faltering attempts to walk on two legs.
According to the theory, when they saw a member of their group lose his footing they would laugh as a sign to each other that something was amiss, but nothing too serious.

The theory could explain why, to this day, the ungainly walk remains a staple element of slapstick humour from John Cleese’s “Ministry of Silly Walks” to Rowan Atkinson’s accident-prone Mr Bean.

“Becoming bipedal means there was a greater chance of tripping and falling. Essentially, the suggestion is that slapstick and humour evolved from that time,” said Matthew Gervais, an American evolutionary biologist who led the study.

“When we laugh at slapstick, we are laughing at the same things that amused our early ancestors. That’s why we find them funny.”

According to the study, the next basic elements of human behaviour that sparked laughter were flatulence and mild sexual mischief. Language appeared only 2m years after the first laugh, enabling people to combine laughter and words into numerous refinements, from amusement at a joke to sneering at a rival.

Marcus Brigstocke, the comedian and scriptwriter for the BBC television series Have I got News for You?, said that the idea of a primitive origin for laughter could be supported by the observation that farts and adults stumbling are among the few things that the smallest children find funny.

He said this was reflected in his live shows: “If you trip over it will always get a bigger laugh than anything that is beautifully constructed and has been passed between the finest comedy writers in the country.”

He added, however, that adults’ appreciation of such humour may also contain an element of cruelty — a type of humour academics say came only with the evolution of speech. “People suddenly and undeservingly stripped of dignity is always funny,” said Brigstocke.

The theory that humour began as a benign force contradicts several other recent theories of why people laugh, including one published in 2001 which claimed that laughing evolved because smiling was too easy to fake by cheating humans trying to break into a group.

Gervais and his colleague David Sloan Wilson devised their theory after reviewing more than 100 studies of laughter covering isolated aspects such as psychology, archeology, history and neurology.

The researchers believe that the forerunner of laughter was the panting noise made by apes and chimpanzees, often in response to tickling, which is believed by scientists to be a way of preserving harmonious relations in a family or other group.

The academics believe that man became more upright as he evolved in Africa, partly because he needed more mobility at a time of increased competition for food.

The shortages of the period — known as the Pliocene epoch — also led to a need for improved group solidarity so that food could be hunted and gathered more effectively.

“Witnessing another individual unexpectedly trip or slip (from an awkward bipedal gait?) while simultaneously recognising the non-seriousness of the mishap often elicits laughter in humans today,” says the study, which appears this week in the Quarterly Review of Biology. “Such a mishap could have become a potent elicitor of laughter in early hominids as a result of Pliocene pressures for increased social play.”

Any comment would be redundant. ;)
 

bob b

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The evolution of altruism, a behaviour that benefits others at one’s own fitness expense, poses a darwinian paradox. The paradox is resolved if many interactions are with related individuals so that the benefits of altruism are reaped by copies of the altruistic gene in other individuals, a mechanism called kin selection. However, recognition of altruists could provide an alternative route towards the evolution of altruism. Arguably the simplest recognition system is a conspicuous, heritable tag, such as a green beard. Despite the fact that such genes have been reported, the ‘green beard effect’ has often been dismissed because it is unlikely that a single gene can code for altruism and a recognizable tag. Here we model the green beard effect and find that if recognition and altruism are always inherited together, the dynamics are highly unstable, leading to the loss of altruism. In contrast, if the effect is caused by loosely coupled separate genes, altruism is facilitated through beard chromodynamics in which many beard colours co-occur. This allows altruism to persist even in weakly structured populations and implies that the green beard effect, in the form of a fluid association of altruistic traits with a recognition tag, can be much more prevalent than hitherto assumed.
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1Jansen and van Baalen, “Altruism through beard chromodynamics,” Nature 440, 663-666 (30 March 2006) .
 

bob b

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David Nicholls appears to have suffered whiplash from a line in a book he was reviewing in Science,1 Power, Sex, Suicide: Mitochondria and the Meaning of Life by Nick Lane (Oxford, 2006).

Though he liked the book in general, he said this about Lane’s explanation for how the first cell got its power generator:

The author is less convincing when he turns to the origin of life (at least he is not afraid to deal with big topics). Citing the work of Mike Russell and Alan Hall, Lane states that in order to generate a primitive cell from an iron sulphide vesicle “all that the cells need to do to generate ATP is to plug an [proton translocating] ATPase through the membrane.”

Any bioenergeticist who has followed the elucidation of the extraordinary structure and mechanism of the mitochondrial ATP synthase over the past decade will pause at the word “all,” because the ATP synthase—with its spinning rotor massaging the surrounding subunits to generate ATP—is without doubt the most amazingly complex molecular structure in the cell.

After that, Nicholls had mostly praise for the rest of the book.

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1David G. Nicholls, “Cell Biology: Energizing Eukaryotes,” Science, 31 March 2006: Vol. 311. no. 5769, p. 1869
 

bob b

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In a new study forthcoming in the May 2006 issue of The American Naturalist, Mark A. Changizi and his coauthors, Qiang Zhang, Hao Ye, and Shinsuke Shimojo, from the California Institute of Technology explore the hypothesis that human visual signs have been cross-culturally selected to reflect common contours in natural scenes that humans have evolved to be good at seeing.

They believe that the contours of letters tend to correlate with contours in nature. There’s more. “The researchers also examined motor and visual skills and the shapes that are easiest to see and form,” the article continues. “They make a strong case that the shape signature for human visual signs is primarily selected for reading, at the expense of writing.”
 

Stratnerd

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So the point is to post stuff that you love to read? Certainly you could keep it to yourself.

Why is nothing ever to the point with you people?
 

bob b

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Beginning with a single cell, Darwinian evolution provides a simple, robust, and powerful algorithm for deriving all the astonishing richness of life, from bacteria to brains. Natural selection and other evolutionary forces, acting on surplus populations of replicating cells and multicellular organisms, lead inevitably to evolution and adaptation. Give biologists a cell, and they’ll give you the world.

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1Richard Robinson, “Jump-Starting a Cellular World: Investigating the Origin of Life, from Soup to Networks,” Public Library of Science, Biology, Vol 3, issue 11, Nov 2005
 

bob b

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“The first laugh: New study posits evolutionary origins of two distinct types of laughter.” The story is about a new hypothesis by Matthew Gervais and David Sloan Wilson. The origin of comedy, they explain, was no laughing matter:

Using empirical evidence [sic] from across disciplines, including theory and data from work on mirror neurons, evolutionary psychology, and multilevel selection theory, the researchers detail the evolutionary trajectory of laughter over the last 7 million years [sic]. Evolutionarily elaborated from ape play-panting sometime between 4 million years ago and 2 million years ago [sic], laughter arising from non-serious social incongruity promoted community play during fleeting periods of safety. Such non-serious social incongruity, it is argued, is the evolutionary precursor to humor as we know it.
However, neuropsychological and behavioral studies have shown that laughter can be more than just a spontaneous response to such stimuli. Around 2 million years ago, human ancestors evolved the capacity for willful control over facial motor systems. As a result, laughter was co-opted for a number of novel functions, including strategically punctuating conversation, and conveying feelings or ideas such as embarrassment and derision.

Their work is to be published in the forthcoming Quarterly Review of Biology.
 

hatsoff

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bob b said:
The FOX article stated that "Isbell's work is detailed in the July issue of the Journal of Human Evolution." Isn't that a peer-reviewed technical journal?

Then find said journal. As it is, this thread is a ridiculous patchwork of meaninglessness which you are attempting to use as evidence in other, unrelated threads.

Better yet, mosey on over to iidb.org's Creation-Evolution debate forum. I'd be very amused to see how you're treated, there.
 

Stratnerd

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This thread is like happening in on a mentally disturbed person laughing and talking to themselves - and some of us asking "are you ok"?

obviously not.
 

bob b

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Stratnerd said:
This thread is like happening in on a mentally disturbed person laughing and talking to themselves - and some of us asking "are you ok"?

obviously not.

I'm surprised that you fail to "get it". ;)
 

Stratnerd

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I'm not the mentally disturbed person making posts to myself.... so I obviously don't see "it"

what does it look like? does it talk to you? do you keep it in your pocket? what do you feed it?
 
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