Larry Moniz Posted over 2 years ago Science is developing the tools towards de-extinction of species on the planet that have become extinct. The question becomes; Should we? This premise rather reminds me of the first SciFi story I read as a youngster: "A Sound of Thunder" by Robert Heinlein. In the story, he project how returning from the past with a dead butterfly profoundly affects the timeline of the story's present. Perhaps we should leave extinction alone. While I'm not sure anyone is playing god (IF there really is a god), but we would be manipulating existing species and who can tell how that will alter the future of our planet.