(ABC News)--Police across the country are used to solving puzzles, but one Ohio police department recently got a plea for help from a local girl seeking to solve a puzzle of a more mathematical bent.

I have a friend who’s a world-renowned mathematician. He doesn’t think like me. Or you. Or, indeed, anyone else I know. This is a good thing — certainly for him. Especially as mathematicians of one ...

Mathematics has always been one of the most challenging subjects for students of all ages. From simple arithmetic to complex ...