Credit...By Martin NaumannCredit...By Martin NaumannStephen WittMr. Witt is the author of “The Thinking Machine,” a history of the A.I. giant Nvidia. He lives in Los Angeles.Oct. 10, 2025How much do we have to fear from A.I., really? It’s a question I’ve been asking experts since the debut of ChatGPT in late 2022.The A.I. pioneer Yoshua Bengio, a computer science professor at the Université de Montréal, is the most-cited researcher alive, in any discipline. When I spoke with him in 2024, Dr. Ben...