It’s time for another Indicator Quiz! For today’s quiz, we’re testing the Indicator knowledge of a brilliant mathematician. Will we stump his theoretician brain? Tune in and find out!  Interested in being a contestant on our next Indicator Quiz? Email us your name and phone number to indicator@npr.org and put "Indicator Quiz" in the subject. Fact checking by Sierra Juarez (npr.org/people/1268825622/sierra-juarez) . Your Next Listen  — An urban planner, infinite scroll, and … what is a public good? (npr.org/2026/06/22/nx-s1-5863543/an-urban-planner-infinite-scroll-and-what-is-a-public-good) Connect with The Indicator  — Sign up for The Indicator’s weekly newsletter (npr.org/indicatornewsletter) !  — Buy the Planet Money book (lnk.to/i3AukBdDWE)   — Find our socials, YouTube and more (linktr.ee/indicator_npr) !  — For sponsor-free episodes, subscribe to NPR+ (plus.npr.org) Support public media with NPR+ and enjoy perks for...