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From your laptop to a loud GPU cluster, AI prompts are a mysterious energy drain. Our columnist attempted to trace their journey—and their impact.

The startup, now valued at about $500 million, directs artificial-intelligence prompts to various large language models based on cost, speed and other factors.

The National Transportation Safety Board chairwoman says heroic actions by the crew aboard an Alaska Airlines flight ensured everyone survived last year when the door plug panel blew out of the plane.