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If we could bring back extinct species, should we? This is one of the questions explored by Beth Shapiro, an evolutionary biologist who takes the fantastic to a higher level with her new book, "How to Clone a Mammoth: The Science of De-Extinction."

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Meat from a bull descended from a cloned cow entered the British food supply, a government regulator said, and "will have been eaten." Sale of the meat was apparently in violation of European law as the Food Standards Agency has not yet decided whether meat derived from cloning is kosher, so to speak.

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Using a combination of genetic engineering and cloning, scientists from the U.S. and Japan have successfully eliminated the protein that causes mad cow disease. So far the cows in the lab have proven immune to the illness, which shreds its victims' brains, driving them mad.

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The Food and Drug Administration is set to approve food products derived from cloned animals and their offspring. Though eating beef from a cloned cow may seem incredibly creepy, the FDA has decided the manufactured twin is just as safe as the original animal, and requires no special identification once in the food supply.

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