Get your timer out and see whether you can remember the golden rule from grade school math class.

Like Liam Neeson in Taken, Presh Talwalkar has a very specific set of skills. They don’t (as far as we know) include hunting down kidnappers and dispatching them in increasingly gruesome and ...

The bat-and-ball problem is a famous math puzzle that more than half of people—even Harvard graduates—get wrong. It's ...