A 1960’s counterculture icon who brought new ideas like computers and solar power into the American mainstream through The Whole Earth Catalogue is now on a new mission: turning back time. Stewart Brand’s team of biologists at Revive and Restore is building a tool kit for genetic restoration that would allow the rebirth of species that have long since disappeared — like the woolly mammoth — while also reversing the extinction process underway in many of our ecosystems. How is this genetic magic possible, and what implications does it have for our planet?