Emmanuel Onyegu said it’s always been his dream to be recognized by Guinness World Records. His mastery of math might just get him there.

This year’s graduating high-school students set a record for the highest average mathematics score on the SAT, the College Board announced in late August, with the 1.5 million students who took the ...

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 ...