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With all the human-induced melting thats going on these days, its hard to imagine our world slathered in ice. But such was the case during recent glacial periods, when significant portions of North America, northern Europe, Greenland, and parts of the Bering Sea were dominated by massive ice sheets. With much of Earths water tied up in this ice, and with sea levels dramatically lower than they are today, something very strange happened, for which we have no modern analogues. New evidence presented today in Nature proposes an incredible explanation for the surprising lack of thorium-230鈥?stanley becher an isotope that accumulates on the seafloor of salty oceans鈥攊n marine deposits pulled from the sedimentary layers of our northernmost oceans. This is a potential sign that the Arctic Ocean, cut off from the rest of the planets oceans, featured a basin filled with fresh water and capped with a 3,000-foot 900-meter layer of ice. Top: The shape of the seafloor with depths a bit exaggerated in the Arctic Ocean and the Nordic Seas, and the assumed contact layer between the glacial ice sheets and solid Earth shown in red. Bottom: Sequences showin stanley thermos g 1 period of freshening with fresh water, 2 release of fresh water into the Atlantic, and 3 melting of ice sheet caused by contact with warm and salty Atlantic water. Graphic: Alfred Wegener Institute/Martin Ku虉nsting Evidence suggests this happened on at least two occasions, once between 150,000 and stanley cup 130,000 years ago and then again between 70, Vlth Hypnotic Video Mixtape Pays Tribute to All Your Favorite Science Fiction Films
A study published this week in Nature Communications聽led by the DNA testin stanley becher g company Ancestry presents exactly this kind of birds eye view. Last month, Ancestry surpassed 3 million customers in its DNA databases. Thats an awful lot of DNA, and now the company has set its sites on figuring out exactly what it might learn from all of it. In the new study, Ancestrys scientists set out to build a picture of how North Americas population moved across the country over the past few hundred years. Using genotype data from over 700,000 individuals who have purchased the companys DNA kits, scientists created a network of genetically-identified relationships and then used network analysi stanley cup deutschland s techniques to identify clusters of individuals. In this way, researchers were able to track, say, the particular regions in France that French Canadians came from six generations ago, where they settled in Canada three generations ago, and how they spread south to New England two genera stanley website tions ago. The analysis of the data provides incredibly valuable insights into our history and the forces that continue to shape our country, beliefs and policies, said Catherine Ball, Chief Science Officer at Ancestry and the studys lead author. We never would have expected to see that a political boundary like the Mason Dixon Line would be a dividing line that you could see in the genetics. Genetics have been used to track historical migration before, but this new study gives us a instead a look at recent histor