Jean Thompson

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…

The Chinese spies wanted more. In meetings during the pandemic with Chinese technology contractors, they complained that surveillance cameras tracking foreign diplomats, military officers and intelligence operatives in Beijing’s embassy district fell short of their needs.The spies asked for an artificial intelligence program that would create instant dossiers on every person of interest in the area and analyze their behavior patterns. They proposed feeding the A.I. program information from databases and scores of cameras that would include car license plates, cellphone data, contacts and more.The A.I.-generated profiles would allow the Chinese spies to select targets and pinpoint their networks and…