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Tópico: Homem - Sabe a galinha?

  1. #121
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    There was a massive population crash in Europe over 14,500 years ago
    New evidence shows a whole group of Europeans vanished, replaced by people of unknown origins.

    Europe wasn't a very hospitable place fifteen millennia ago. The westernmost landmass of the Eurasian continent had endured a long ice age, with glaciers stretching across northern Europe and into the region we now call Germany. But suddenly, about 14,500 years ago, things started to warm up quickly. The glaciers melted so fast around the globe that they caused sea levels to rise 52 feet in just 500 years. Meanwhile, the environment was in chaos, with wildlife trying vainly to adjust to the rapid fluctuations in temperature. Humans weren't immune to the changes, either.



    http://arstechnica.com/science/2016/...500-years-ago/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  2. #122
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    Ancient hook-ups with Neanderthals left lasting effects on our health
    The genetic consequences of prehistoric loving are still doing a walk of shame.

    The questionable interbreeding left traces of Neanderthal DNA that are linked to mood disorders, mostly depression, as well as tobacco-use disorders, skin conditions, and hypercoagulation (excessive blood clotting), according to a new study published Thursday in Science. The findings lend support to the theory that our past hominin hook-up has had a lasting influence on modern humans’ health. The data also offers hints at genetic adaptations of our ancient ancestors and, potentially, new insights into the diseases they help cause in modern humans, the authors suggest.

    Having these traces of Neanderthal DNA doesn’t “doom us” to having these diseases, cautioned John Capra, bioinformaticist at Vanderbilt University and coauthor of the study. The genetic traces linked to disease in modern humans doesn’t mean that Neanderthals were stricken with those diseases either, he added. In fact, some of them could have been advantageous.

    http://arstechnica.com/science/2016/...on-our-health/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  3. #123

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    Harvard Develops 100% Accurate Test That Can Predict Cancer Up To 13 Years Before Diagnosis
    http://anonhq.com/harvard-develops-1...ore-diagnosis/

  4. #124
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    Two new studies undermine “over-simplistic models of human evolution”
    The relationship between early human groups was incredibly complicated.

    In other words, modern humans didn't sweep out of Africa, killing everything in their paths. They settled down with the locals, many different times. Evolutionary biologist Carles Laleuza-Fox, who was not involved in the study, told the New York Times' Carl Zimmer, "This is yet another genetic nail in the coffin of our over-simplistic models of human evolution." These papers also testify to how long different groups of humans have been intermingling, sharing ideas and hearths. Even though humans are notorious for hating and killing strangers, there's no denying that migration is written into our DNA, as well as a history of embracing people who are different.

    http://arstechnica.com/science/2016/...man-evolution/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  5. #125
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    Forget Tolkien, the scientific tale of real-life “hobbits” is even more complex
    After recently correcting an error, H. floresiensis suddenly makes a bit more sense.
    ...
    He's candid about the fact that the initial date was way off base. Even if everyone did their job as best as they could have, he says, "We're all going to make mistakes."

    At the same time, he points out that there was a hefty dose of bad luck in the way the discoveries took place. If the team had started digging just slightly south, he says, they would have discovered the details of the layout before reaching the critical remains.
    ...
    http://arstechnica.com/science/2016/...nitys-history/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  6. #126
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    Human history traced via the Y chromosome
    Male lineages expand rapidly at key points in our past.

    The history of humanity, as we've read it through DNA, has been written largely by females. Mitochondrial DNA, which is inherited only from our mothers, is short and easy to sequence, so researchers have frequently relied on it to study human DNA, both in present populations and in old bones.

    But as DNA sequencing technology has improved, it has become progressively easier to sequence all the DNA that an individual carries. If said individual is a male, the resulting sequence will include the Y chromosome, which is inherited only from fathers. With more data in hand, researchers have been able to perform an analysis of the Y chromosome's history, and they've found that its sequence retains the imprint of both the migrations and technological innovations that have featured in humanity's past.

    http://arstechnica.com/science/2016/...-developments/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  7. #127
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    The “hobbit” was tiny already by 700,000 years ago
    Very old and very small Homo floresiensis-like remains found in Indonesia.

    http://arstechnica.com/science/2016/...000-years-ago/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  8. #128
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    Want to know how many times ancient humans migrated out of Africa? Check their genes
    Three massive genetic studies draw a new map of ancient human migrations
    ...
    Together, these studies narrow down the universe of possible ways that human history unfolded, Akey says. With different populations, methods, and approaches, each of these studies came to a similar conclusion: modern populations of non-Africans can trace the majority of their ancestry to a single migration of ancient humans out of Africa who then interbred with Neanderthals. Contributions from Denisovans and possibly even an earlier group of ancient humans may well have filled out the rest of the genome in different populations.

    http://www.theverge.com/2016/9/21/13...tion-evolution
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  9. #129
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    What happened to all the Neanderthal genes?
    When Neanderthal genes made it to humans, they were largely weeded out.

    It's now clear that our ancestors, upon leaving Africa, interbred with the Neanderthals and Denisovans, archaic humans that occupied Europe and Asia. The first offspring of those pairings would have had equal amounts of their two ancestral legacies: one chromosome in each pair would be modern human, the other archaic. But most of that archaic legacy is now gone, down to about two percent from the initial 50. What happened?

    http://arstechnica.com/science/2016/...derthal-genes/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  10. #130
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    How cooking vegetables changed humanity 10,000 years ago
    Unprecedented discovery reveals that ancient pots were mostly for cooking fruits, grains, grasses.

    When you imagine Neolithic hunter-gatherers, you probably think of people eating hunks of meat around an open fire. But the truth is that many humans living 10,000 years ago were eating more vegetables and grains than meat. Researchers discovered this after an extensive chemical analysis of 110 pottery fragments found in the Libyan Sahara Desert, a region that was once a humid savannah full of lakes, herd animals, and lush plant life.

    http://arstechnica.com/science/2016/...ed-human-life/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  11. #131
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    Inuit may have a genetic advantage when it comes to dealing with cold
    Too bad all of us didn’t preserve this advantage
    ...
    All Inuit had a gene variation that helps them build more brown fat. Unlike white fat, which just contains calories, brown fat burns energy and produces heat. It’s helpful for adapting to the cold, and is especially common in babies. Most interesting, though, this specific pattern of gene variation matched very closely with the same genome portion of the Denisovans, suggesting that Denisovan ancestors are the source of this evolutionary advantage.
    ...
    http://www.theverge.com/2016/12/31/1...cold-brown-fat
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  12. #132
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    Gone but not forgotten: how ancient Neanderthal genes still affect modern people
    Ancient interbreeding still affects us today, study says

    DNA inherited from Neanderthals affects which of our genes are turned on or off, according to a study published today in Cell. This phenomenon, called regulation of gene expression, means that traits such as height and susceptibility to diseases like schizophrenia or lupus may be affected in people with Neanderthal ancestry, say scientists from the University of Washington in Seattle.

    http://www.theverge.com/2017/2/23/14...kin-conditions
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  13. #133
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    Fossils reveal ancient “unknown” human in China
    Two skulls are a "mosaic" of modern and Neanderthal features.

    https://arstechnica.com/science/2017...uman-in-china/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  14. #134
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    Neanderthal teeth tell tales of diet and medicine
    But interpreting rudimentary DNA evidence requires some leaps.

    Around 50,000 years ago in Spain, a Neanderthal had a toothache and popped the botanical version of an aspirin. Maybe. Although it's far from clear-cut, there’s evidence from old teeth that hints at the possibility.

    https://arstechnica.com/science/2017...-and-medicine/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  15. #135
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    Australia was colonized by a single group 50,000 years ago
    Finding could help explain aspects of Aboriginal communities' belief systems.

    At the time that this group was walking into Australia, the continent was joined to New Guinea in a larger landmass called Sahul. What's remarkable is that this group of explorers appears to have colonized the entire Australian continent—or at least its coasts—within about 2,000 years. Genetic evidence reveals that the original group split in two, one heading east and the other west. They met again in southern Australia just a couple of millennia later.

    https://arstechnica.com/science/2017...000-years-ago/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  16. #136
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    How many calories is that human? A nutritional guide for prehistoric cannibals
    Early humans ate each other — but why?



    http://www.theverge.com/2017/4/6/151...rthal-behavior
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  17. #137
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    Incredible discovery places humans in California 130,000 years ago
    Date is a whopping 115,000 years earlier than previous findings of humans in the Americas.

    https://arstechnica.com/science/2017...ay-scientists/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  18. #138
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    New analysis relocates the “hobbit” on the human family tree
    Were humans migrating out of Africa much earlier than we realized?

    https://arstechnica.com/science/2017...n-family-tree/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  19. #139
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    Possible human ancestor turns out to have shared Earth with us
    A recent small-brained, early-looking hominid shakes up the family tree.

    https://arstechnica.com/science/2017...earth-with-us/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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  20. #140
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    300,000 year-old “early Homo sapiens” sparks debate over evolution
    Some researchers call it a major breakthrough, but others say it's a "nothingburger."
    ...
    These scientists don't like the way Hublin and his colleagues suggest that the "earliest" Homo sapiens walked the Earth 300,000 years ago. Evolution is a constant process, with no perfect beginnings and endings, so there can never really be an "earliest" version of humanity—only transitional forms between one species and the next.
    ...
    https://arstechnica.com/science/2017...ver-evolution/
    Lá em cima há planícies sem fim; Há estrelas que parecem correr; Há o Sol e há dia a nascer;
    E nós aqui sem parar numa Terra a girar…


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