They're trying to resurrect an extinct rat now. It's not going so well - USA TODAY

Bringing back extinct species has been an intriguing topic for decades. But resurrecting a long-gone animal is no sure thing, scientists say.

• Scientists have recreated the genome of the Christmas Island rat, which went extinct more than 100 years ago.
• But about 5% of the rat's genetic makeup could not be recreated, which me… [+4594 chars]
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