Artificial intelligence is a recurring theme in recent remarks by top executives at Alphabet. The company’s latest Founders’ Letter, penned by Sergey Brin, is no exception—but he also finds time to namecheck possible downsides around safety, jobs, and fairness. The company has issued a Founders’ Letter---usually penned by Brin, cofounder Larry Page or both---every year, beginning with the letter that accompanied Google’s 2004 IPO.

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