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This is amazing. I want one. I'm interested in exactly what they did.
http://news.yahoo.com/flowering-plant-revived-30-000-years-russian-permafrost-200137925--abc-news.html
It was cultivated in the lab, with help from some "clonal micropropagation," from seeds and leaves probably collected by some long-ago species of squirrel. The researchers, publishing their find today in Proceedings of the National Academy of Sciences, say the squirrel's burrow was probably frozen over quickly, and stayed that way until they discovered it.
"The squirrels dug the frozen ground to build their burrows, which are about the size of a soccer ball, putting in hay first and then animal fur for a perfect storage chamber," said Stanislav Gubin, one of the authors of the study, who spent years rummaging through the area for squirrel burrows. "It's a natural cryobank."
http://news.yahoo.com/flowering-plant-revived-30-000-years-russian-permafrost-200137925--abc-news.html