Remember Dolly the sheep? How in 1996 she made international news as the first cloned mammal? Now, imagine using those techniques to bring back extinct animals, such as the mammoth or the passenger pigeon. While the concept may no longer be science fiction, the costs and consequences of this research are still unknown. MacArthur Award recipient and evolutionary biologist Beth Shapiro of UC Santa Cruz discusses the scientific and ethical questions raised by what’s known as Ancient DNA research in this fascinating talk presented by the new Institute for Practical Ethics at UC San Diego.