Using new genetic technologies, scientists are trying to bring back extinct species. Researchers are working to revive the passenger pigeon, once the most abundant bird in the world, and the woolly mammoth, which they say could slow down the melting of Arctic permafrost. It may be possible, but is it right to turn back the clock?

Watch our segment on KQED Newsroom:

http://www.youtube.com/watch?v=is21pLJmQn8

The half-hour documentary, Reawakening Extinct Species, will be online on Tuesday, April 22, and it airs on TV on KQED 9 on Wednesday, April 23 at 7:30.

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