It started with a picture posted on the internet, and ended in an extravagant cryptocurrency bidding war. NFTs, or “nonfungible tokens,” have recently taken the art world by storm. Sabrina Tavernise, a national correspondent for The Times, speaks with the Times columnist Kevin Roose about digital currency’s newest frontier, his unexpected role in it and why it matters. Guest: Kevin Roose, a technology columnist for The Times who examines the intersection of technology, business, and culture.