A growing number of scientists worldwide are working on projects to bring back to life animals like the wooly mammoth and the passenger pigeon. But is the revival of extinct species a good thing for humanity? Or for the planet? We get into the science and the controversy of de-extinction with Nathaniel Rich, the writer behind The New York Times Magazine's cover story, The Mammoth Cometh.
ADDITIONAL READING:
The National Geographic's extensive multimedia coverage of de-extinction.
Ted Talks about de-extinction.
Elizabeth Kolbert, a science writer for The New Yorker, criticizes the practice.