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 ...

There's a new Guinness World Record holder for how fast someone can do math. Aaryan Shukla — who has been dubbed "the human calculator" can solve complex problems in his head in seconds. OK, Ari, what ...