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Scientists have unveiled a 47-million-year-old fossilised skeleton of a monkey hailed as the missing link in human evolution.
This 95%-complete 'lemur monkey' is described as the "eighth wonder of the world"
The search for a direct connection between humans and the rest of the animal kingdom has taken 200 years - but it was presented to the world today at a special news conference in New York.
The discovery of the 95%-complete 'lemur monkey' - dubbed Ida - is described by experts as the "eighth wonder of the world".
They say its impact on the world of palaeontology will be "somewhat like an asteroid falling down to Earth".
Researchers say proof of this transitional species finally confirms Charles Darwin's theory of evolution, and the then radical, outlandish ideas he came up with during his time aboard the Beagle.
Sir David Attenborough said Darwin "would have been thrilled" to have seen the fossil - and says it tells us who we are and where we came from.
"This little creature is going to show us our connection with the rest of the mammals. This is the one that connects us directly with them," he said.
"Now people can say 'okay we are primates, show us the link'. The link they would have said up to now is missing - well it's no longer missing."
A team of the world's leading fossil experts, led by Professor Jorn Hurum, of Norway's National History Museum, have been secretly researching the 1ft 9in-tall young female monkey for the past two years.
And now it has been transported to New York under high security, and unveiled to the world during the bicentenary of Darwin's birth.
Later this month, it will be exhibited for one day only at the Natural History Museum in London before being returned to Oslo.
Scientists say Ida - squashed to the thickness of a beer mat by the immense passage of time - is the most complete primate fossil ever found.
With her human-like nails instead of claws, and opposable big toes, she is placed at the very root of human evolution when early primates first developed features that would eventually develop into our own.
Another important discovery is the shape of the talus bone in her foot, which humans still have in their feet an incredible 70 million lifetimes later.
Ida was unearthed by an amateur fossil-hunter some 25 years ago in Messel pit, an ancient crater lake near Frankfurt, Germany, famous for its fossils.
She was cleaned and set in polyester resin - and incredibly, was hung on a mystery German collector's wall for 20 years.
Sky News sources say the owner had no idea of the unique fossil's significance, and simply admired it like a cherished Van Gogh or Picasso painting.
But in 2006, Ida came into the hands of private dealer Thomas Perner, who presented her to Prof Hurum at the annual Hamburg Fossil and Mineral Fair in Germany - a centre for the murky world of fossil-trading.
Prof Hurum said when he first saw the blueprint for evolution - the "most beautiful fossil worldwide" - he could not sleep for two days.
A home movie records the dramatic moment. "This is really something that the world has never seen before, this is a unique specimen, totally unique," he says, clearly emotional.
He knew she should be saved for science rather than end up hidden from the world in a wealthy private collector's vault.
But the dealer's asking price was more than $1 million (£660,000) - ten times the amount even the rarest of fossils fetch on the black market.
Eventually, after six months of negotiations, he managed to raise the cash in Norway and brought Ida to Oslo.
Prof Hurum - who last summer dug up the fossil remains of a 50ft marine monster called Predator X from the permafrost on Svalbard, a Norwegian island close to the North Pole - then assembled a "dream team" of experts who worked in secret for two years.
They included palaeontologist Dr Jens Franzen, Dr Holly Smith, of the University of Michigan, and Philip Gingerich, president-elect of the US Paleontological Society.
Researchers could prove the fossil was genuine through X-rays, knowing it is impossible to fake the inner structure of a bone.
Through radiometric dating of Messel's volcanic rocks, they discovered Ida lived 47 million years ago in the Eocene period, when tropical forests stretched right to the poles, and South America was still drifting and had yet to make contact with North America.
During that period, the first whales, horses, bats and monkeys emerged, and the early primates branched into two groups - one group lived on mainly as lemurs, and the second developed into monkeys, apes and humans.
The experts concluded Ida was not simply a lemur but a 'lemur monkey', displaying a mixture of both groups, and therefore putting her at the very branch of the human line.
"When Darwin published his On the Origin of Species in 1859, he said a lot about transitional species...and he said that will never be found, a transitional species, and his whole theory will be wrong, so he would be really happy to live today when we publish Ida," said Prof Hurum.
"This fossil is really a part of our history; this is part of our evolution, deep, deep back into the aeons of time, 47 million years ago.
"It's part of our evolution that's been hidden so far, it's been hidden because all the other specimens are so incomplete.
"They are so broken there's almost nothing to study and now this wonderful fossil appears and it makes the story so much easier to tell, so it's really a dream come true."
Up until now, the most famous fossil primate in the world has been Lucy, a 3.18-million-year-old hominid found in Ethiopia in 1974. She was then our earliest known ancestor, and only 40% complete.
But at 95% complete, Ida was so well preserved in the mud at the bottom of the volcanic lake, there is even evidence of her fur shadow and remains of her last meal.
From this they concluded she was a leaf and fruit eater, and probably lived in the trees around the lake.
The absence of a bacculum (penis bone) confirmed she was female, and her milk teeth put her age at about nine-months-old - in maturity, equivalent to a six-year-old human child.
This was the same age as Prof Hurum's daughter Ida, and he named the fossil after her.
The study is being published and put online today by the Public Library of Science, a leading academic journal with offices in Britain and the US.
Co-author of the scientific paper, Prof Gingerich, likens its importance to the discovery of the Rosetta Stone, an ancient Egyptian artifact found in 1799, which allowed us to decipher hieroglyphic writing.
One clue to Ida's fate - and her remarkable preservation as our oldest ancestor - was her badly fractured left wrist.
The team believes this stopped her from climbing and she had to emerge from the trees to drink water from the 250-metre-deep lake.
They think she was overcome by carbon dioxide gas from the crater, and sunk to the bottom where she was preserved in the mud as a time capsule - and a snapshot of evolution.
But amazingly this final piece of Darwin's jigsaw was almost lost to science when German authorities tried to turn Messel into a massive landfill rubbish dump.
Eventually, after campaigning by Dr Franzen, the plans were rejected and the fossil-rich lake was designated a World Heritage Site.
But no doubt there would have been one person happy for the missing link to have remained hidden.
When Darwin famously told the Bishop of Worcester's wife about his theory of evolution, she remarked: "Descended from the apes! My dear, let us hope that it is not true, but if it is, let us pray that it will not become generally known."
Keep in mind that the theory of evolution is a faith-based theory, just as Christianity and the belief in a divine being are. One set of fossils is not nearly enough to confirm the theory.
On Tuesday morning, researchers will unveil a 47-million-year-old fossil they say could revolutionize the understanding of human evolution at a ceremony at the American Museum of Natural History.
But the event, which will coincide with the publishing of a peer-reviewed article about the find, is the first stop in a coordinated, branded media event, orchestrated by the scientists and the History Channel, including a film detailing the secretive two-year study of the fossil, a book release, an exclusive arrangement with ABC News and an elaborate Web site.
If this was really such a big deal, and they really found it two years ago, I'm surprised nobody has heard anything about it until now.
If this was really such a big deal, and they really found it two years ago, I'm surprised nobody has heard anything about it until now.
Not saying this is the case, but when you keep everything secret like they have, and are planning multiple media releases at the same time, it doesn't really give dissenting opinions any say in the media blitz.
I'm definitely not going to get into the semantics of what defines theory, but if you've read Darwin's book, you'd know what I mean.
That is a huge leap to make right there.
He's pointing out the fact that you said evolution is "faith-based", when clearly you meant that religion is "faith-based". Theory is an educated guess based on evidence and is science-based.
He's pointing out the fact that you said evolution is "faith-based", when clearly you meant that religion is "faith-based". Theory is an educated guess based on evidence and is science-based.
I did mean to say that evolution is faith-based. He got it right.
Both religion and evolution are faith-based. That is indisputable (although I know people will dispute it). One must make huge assumptions in order for evolution to work. That is faith. It is a "God"- or "higher power"-less faith, but faith nonetheless.
I am a scientist and engineer and work in semiconductor failure analysis. Scientific method is at the root of what I do. I know what and how the process is and what it means to thoroughly test a hypothesis and create a theory. I've done so much research on this topic that I can talk about it all day long if one so desires.
All I'm saying is evolution (in the context we're discussing here; i.e. human evolution) is not fact, it's faith. There's definitely nothing wrong with that, by the way, but people need to understand what truth is and what isn't.
He's pointing out the fact that you said evolution is "faith-based", when clearly you meant that religion is "faith-based". Theory is an educated guess based on evidence and is science-based.
Ah, he baited me and I took it. I feel sheepish now.
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BREAKING NEWS! Missing Link discovered!!
it's almost as bad as star trek vs star wars.
Clearly they're not biased. 
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