Recipe for a Resurrection -- Bringing extinct species back to life is no longer considered science fiction. But is it a good idea?

"I laughed when Steven Spielberg said that cloning extinct animals was inevitable," says Hendrik Poinar of McMaster University, an authority on ancient DNA who served as a scientific consultant for a film about the making of Jurassic Park. "But I'm not laughing anymore, at least about mammoths. This is going to happen. It's just a matter of working out the details."

Read More: http://ngm.nationalgeographic.com/2009/05/cloned-species/mueller-text