OpenAI’s claim to have solved one of the great problems in mathematics has itself created problems. We ask why the breakthrough has shaken the field. On the 25th anniversary of 9/11 we examine the vast counterterrorism machinery that followed in America, and nascent efforts to pare those powers back. And remembering Guo Lanying, a Chinese singer who championed traditional opera.Watch extended clips from Insider here.Guests and host:Sam Wikeley, science correspondentSam Beal, Washington correspondentAnn Wroe, obituaries editorJason Palmer, co-host of “The Intelligence”Topics covered: mathematics, AI, Millennium Prize Problems9/11 anniversary, counterterrorism lawGuo Lanying, Chinese operaListen to what matters most, from global politics and business to science and technology—subscribe to The Economist. Hosted on Acast. See acast.com/privacy for more information.

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“What did the council decide on item 42?” — answered with the speaker and the moment.