Jurassic Park In Real Life?

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According to this article: http://www.nytimes.com/2008/11/23/weekinreview/23wade.html?_r=1 researchers at Pennsylvania State University might be able to regenerate a mammoth from ancient DNA for just $10 million. They might also be close to recreating the Neanderthal! Didn't these guys see Jurassic Park? Don't they realize the complications that could occur? What do you think? Should these prehistoric creatures stay in the past? Or should they come back from the past?