IDU: Where did math come from?

Is math discovered or invented? Mathematicians invent and create all the mathematical objects, concepts, and methods but everything has to follow the immutable rules of logic in that we have no control over them. So which is it? Discovered? Invented? Emeritus mathematician at Stanford University Keith Devlin joins William Shatner on this week's episode of 'I Don't Understand to explains the origin of mathematics.