If I asked you to multiply 51,689 by 89,542 without using your phone or calculator, how much time would it take you? Fourteen-year-old Aaryan Shukla can solve this arithmetic in a matter of ...

OK, Ari, what is 567 times 123? And you have exactly three seconds to answer, so you better move fast. SHAPIRO: You can't be serious right now, Juana. SUMMERS: (Laughter). SHAPIRO: There's no way ...