We are Christopher Caldwelloften taught to think of math as a rigid set of rules, never to be questioned. But that is exactly the wrong way to think about it, according to one mathematician. Today on the show, we talk to Eugenia Cheng about her new book "Is Math Real?: How Simple Questions Lead Us to Mathematics' Deepest Truths" and how math can help us ask more probing questions about the world around us.

For sponsor-free episodes of The Indicator from Planet Money, subscribe to Planet Money+ via Apple Podcasts or at plus.npr.org.

Music by Drop Electric. Find us: TikTok, Instagram, Facebook, Newsletter.