Philosopher Nick Bostrom recently posted a paper , where he postulated that a small chance of AI annihilating all humans might be worth the risk, because advanced AI might relieve humanity of “its universal death sentence.” That upbeat gamble is quite a leap from his previous dark musings on AI, which made him a doomer godfather. His 2014 book Superintelligence was an early examination of AI’s existential risk. One memorable thought experiment: An AI tasked with making paper clips winds up destroying humanity because all those resource-needy people are an impediment to paper clip production. His more recent book, Deep Utopia , reflects a shift in his focus . Bostrom, who leads Oxford’s Future of Humanity Institute, dwells on the “solved world” that comes if we get AI right. STEVEN LEVY: Deep Utopia is more optimistic than your previous book. What changed for you? NICK BOSTROM: I call myself a fretful optimist.…