It's "Jurassic Park" come true -- sort of. Scientists can't bring back dinosaurs, but they may soon be able to clone DNA from more-recently extinct animals to bring them back to life. Researchers are working now on re-creating a passenger pigeon, a gastric-brooding frog and a mammoth. But the possibility of eventual success has sparked a new debate about the wisdom and the ethics of reversing history.
TED Talk: The Dawn Of De-Extinction. Are You Ready?
Stewart Brand says we have the technology (and the biology) to bring back species that humanity wiped out. So -- should we? Which ones? He asks a big question whose answer is closer than you may think.