There is a new article in the New York Times about the "de-extinction" movement to bring back passenger pigeons and mammoths. It includes a how-to guide on how geneticists plan to do it and what some of the ethical and scientific implications of this work are.
http://www.nytimes.com/2014/03/02/magazine/the-mammoth-cometh.html?hp&_r=0
http://www.nytimes.com/2014/03/02/magazine/the-mammoth-cometh.html?hp&_r=0
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