The Walking Dead

Scientists may soon be able to revive long-extinct species. But should they?

Each year, an estimated 10,000 to 100,000 animal species die off. They join the countless species that have gone extinct over the course of the earth's history--and extinction means forever.

At least it used to. Scientists are now closing in on the ability to bring extinct species back from oblivion. No, this doesn't mean the plot of Jurassic Park--back in theaters this month in 3-D format--is going to become a reality. Researchers need intact DNA for de-extinction to work, and dinosaurs have been gone too long for any genetic material to remain in fossils.

But there's a very real chance that...

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