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Index » Regional/Local » USA/Canada » Evolution! Page: 1, 2, 3 ... 115, 116, 117  Next
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Posted: Jan 15, 2016 - 5:00am

Grisly find suggests humans inhabited Arctic 45,000 years ago | Science | AAAS
To hunt mammoths in the Arctic, humans had to have the hunting tools, insulated clothes and shelter to survive in the Arctic.
Genetic data does not support ancient trans-Atlantic migration
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Posted: Jan 10, 2016 - 7:19am

Gene tweak led to humans’ big toe | Science News
Decrease in bone-building protein helped enable upright walking
TRUE BLUE The blue coloring in this mouse embryo shows that a genetic switch that controls production of a bone- and tissue-building protein turns on genes in the lower half of the embryo’s body.
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Posted: Nov 4, 2015 - 9:34am


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Posted: Sep 20, 2015 - 5:08pm

'Tree of life' for 2.3 million species released
Large, open-access resource aims to be 'Wikipedia' for evolutionary history

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Posted: Sep 19, 2015 - 3:03pm

Is Homo naledi just a primitive version of Homo erectus? · John Hawks

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Posted: Sep 15, 2015 - 10:01pm

Humans aren’t so special after all: The fuzzy evolutionary boundaries of Homo sapiens
Recent discoveries point to shared traits and blurred borders with our closest relatives.
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Posted: Sep 12, 2015 - 12:16pm

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Posted: Sep 10, 2015 - 5:24pm

Explorer Lee Berger on Finding New Human Species, Homo Naledi

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Posted: Sep 8, 2015 - 10:10pm

 ScottN wrote:
Perhaps they all got along... all creatures "understanding" their roles in perfect harmony with their environment. {#Smile} 

It's a small world after all... {#Cheesygrin}
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Posted: Sep 8, 2015 - 6:55pm

 RichardPrins wrote:
Earliest sea scorpion discovered in Iowa
::

Giant scorpions may have terrorized the seas some 460 million years ago.

The species of sea scorpion, Pentecopterus decorahensis, stretched up to 1.7 meters long — almost as long as a twin-sized bed. Scientists unearthed more than 150 fragmentary remnants from the sandy shale of an impact crater in what is now Iowa. (...)



 
Perhaps they all got along... all creatures "understanding" their roles in perfect harmony with their environment. {#Smile}
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Posted: Sep 8, 2015 - 6:43pm

Earliest sea scorpion discovered in Iowa
::

Giant scorpions may have terrorized the seas some 460 million years ago.

The species of sea scorpion, Pentecopterus decorahensis, stretched up to 1.7 meters long — almost as long as a twin-sized bed. Scientists unearthed more than 150 fragmentary remnants from the sandy shale of an impact crater in what is now Iowa. (...)


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Posted: Aug 16, 2015 - 11:48am


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Posted: Aug 7, 2015 - 12:27am

BBC - Earth - The mystery of Neanderthals' massive eyes

(...) In 2013, a team led by Eiluned Pearce of the University of Oxford in the UK proposed a radical explanation: their eyes were to blame.

From a detailed analysis of modern human and Neanderthal skulls, Pearce found that both their eyes and their brain's visual system were larger than ours.

Their big eyes meant that they devoted a larger part of their brain to seeing.

However, Pearce suggests that this came at a cost to their social world. Other parts of their brain would in turn have been smaller.

"Since Neanderthals evolved at higher latitudes and also have bigger bodies than modern humans, more of the Neanderthal brain would have been dedicated to vision and body control, leaving less brain to deal with other functions like social networking," Pearce said at the time.

The theory goes that, unlike us, they could not devote large parts of their brain to developing complex social networks. So when they were faced with major threats, such as a changing climate or competition from modern humans, they were at a disadvantage. (...)

It's a neat story. But other biologists are far from convinced, and some of them have set out to unpick the idea.

They have now published their findings in the American Journal of Physical Anthropology. The new analysis suggests that Neanderthals' large eyes did not contribute to their extinction after all.

John Hawks of the University of Wisconsin-Madison and his colleagues looked at 18 living primate species, to find out whether the size of their eye sockets was linked to the size of their social groups.

Rather than bigger eyes resulting in smaller social groups, they found that the opposite was true. "Big eyes actually indicate bigger social groups in other primates," says Hawks. (...)


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Posted: May 8, 2015 - 1:01am

Apes under pressure show their ingenuity – and hint at our own evolutionary past

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Posted: Apr 22, 2015 - 11:10am

Why I teach evolution to Muslim students
Encouraging students to challenge ideas is crucial to fostering a generation of Muslim scientists who are free thinkers, says Rana Dajani.
Certain problematic attitudes towards science have been imported into Muslim societies as a part of rapid globalization and modernization — the rejection of the theory of evolution, for example. But this also offers an opportunity.

I teach evolution to university students in Jordan. Almost all of them are hostile to the idea at first. Their schoolteachers are likely to have ignored or glossed over it. Still, most students are willing to discuss evolution, and by the end of the course, the majority accept the idea. If Muslim students can challenge ideas on such a controversial academic topic, then they can also approach other aspects of their lives by questioning — and not just blindly accepting — the status quo. These tools and attitudes are crucial to the development of their personalities and to becoming responsible citizens.

Students in my classes often get a shock. I wear a hijab, so they know that I am a practising Muslim, yet they hear me endorsing evolution as a mechanism to explain diversity and the development of species, and citing Charles Darwin as a scientist who contributed to our understanding of the emergence and diversification of life on Earth. I am almost always the first Muslim they have met who says such things. (...)

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Posted: Apr 20, 2015 - 5:47pm

Although evolution is overwhelmingly accepted by scientific communities, it remains a taboo and often misunderstood subject for much of the rural American South. Dr. Amanda Glaze studies this deeply rooted cultural sentiment and its religious and societal influences in universities, schools and communities throughout the Southeastern United States. Using both quantitative surveys and qualitative interviews, she strives to understand the experiences and perceptions of her fellow teachers and the community around her to better inform science teaching and teacher education nationwide. She also teaches evolution-based science courses to high school and college students in the hopes of shifting the next generation's views on the subject.

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Posted: Apr 6, 2015 - 11:30am

How Europeans evolved white skin | Science/AAAS | News
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Posted: Mar 21, 2015 - 11:35am

The origin of the anus: The extraordinary evolution of our most embarrassing organ

Yes that’s a picture of a puppy, with a little bit of its rear end showing. And no, we couldn’t actually illustrate this story with an anus, now could we?

And before we discuss the origin of the anus; let’s back up a little. It’s a subject surrounded by, how should we put it, a bit of cheek. A topic right for puns, or a touch of verbal diarrhoea as we can’t but help see the innuendo.

See what I mean? So we try to get serious, to focus, and ask why has no one gotten to the bottom of this particular mystery before? Is it a crappy research topic, or by not addressing it, have other scientists fallen behind? Is even reporting such a subject, well, a little anal?

Perhaps, if jokes and innuendo are all we care about. But if we’re interested in some of the most fundamental questions about how animals evolved and function, then read on. (...)


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Posted: Feb 21, 2015 - 6:01pm

Everything from criminality to love of gossip is in our genes according to some biologists. Yet behaviour varies dramatically between cultures. Does this cultural variation mean that the theory of evolution is flawed? Can it be rescued with a new theory or is culture beyond genetics?

The Panel

Julian Baggini explores the limits of evolution with philosopher Janet Radcliffe Richards, anthropologist Daniel Everett and Oxford evolutionary psychologist Oliver Scott Curry.


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Posted: Feb 19, 2015 - 6:50pm

A New Theory on How Neanderthal DNA Spread in Asia - NYTimes.com

In 2010, scientists made a startling discovery about our past: About 50,000 years ago, Neanderthals interbred with the ancestors of living Europeans and Asians.

Now two teams of researchers have come to another intriguing conclusion: Neanderthals interbred with the ancestors of Asians at a second point in history, giving them an extra infusion of Neanderthal DNA.

The findings are further evidence that our genomes contain secrets about our evolution that we might have missed by looking at fossils alone. “We’re learning new, big-picture things from the genetic data, rather than just filling in details,” said Kirk E. Lohmueller, a geneticist at the University of California, Los Angeles, and co-author of one of the new studies.

The oldest fossils of Neanderthals date back about 200,000 years, while the most recent are an estimated 40,000 years old. Researchers have found Neanderthal bones at sites across Europe and western Asia, from Spain to Siberia.

Some of those bones still retain fragments of Neanderthal DNA. Scientists have pieced those DNA fragments together, reconstructing the entire Neanderthal genome. It turns out that Neanderthals had a number of distinct genetic mutations that living humans lack. Based on these differences, scientists estimate that the Neanderthals’ ancestors diverged from ours 600,000 years ago. (...)


The Evolution Catechism - The New Yorker
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