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Meet the Millers, George and Roxanne, proprietors of the world’s largest collection of mechanical puzzles: physical objects that a puzzler holds and manipulates while seeking a solution. In total, the Miller collection — an accumulation of collections, and collections of collections — amounts to more than 80,000 puzzles. It comprises some five thousand Rubik’s Cubes, including a 2-by-2-by-2 rendering of Darth Vader’s head. And there are more than 7,000 wooden burr puzzles, such as the interlocking, polyhedral creations by Stewart Coffin, a Massachusetts puzzle maker; they evoke a hybrid of a pine cone and a snowflake and are Mr. Miller’s…

Last spring, when Karim Lakhani began testing how ChatGPT affected the work of elite business consultants, he thought they’d be delighted by the tool. In a preliminary study of two dozen workers, the language bot had helped them finish two hours’ worth of tasks in 20 minutes.“I assumed they, like me, would think, ‘Great! I can do so much more!” said Dr. Lakhani, a professor at the Harvard Business School.Instead, the consultants had feelings of unease. They appreciated that they had done better work in less time. But ChatGPT’s quick work threatened their sense of themselves as high-skilled workers, and…