Usually, the first class that an MBA student takes is accounting. That involves, yes, equations and counting widgets...but it's more than that. Inside the simple act of accounting is a revolutionary way of thinking not just about a business, but about the world. A universe where all the forces are in balance. Accounting gives you a sixth sense–one that can help you determine whether your business will survive or fail.

In this class, you'll learn the basics of accounting, and uncover its origins. We'll introduce you to the man who helped it spread around the world. He was a monk, a magician, and possibly the boyfriend of Leonardo da Vinci.

Is accounting... sexy?

Yes. Yes it is.

Find all episodes of Planet Money Summer School here.

This series is hosted by Robert Smith, and produced by Max Freedman. Our project manager is Julia Carney. This episode was edited by Sally Helm and engineered by Robert Rodriguez. The show is fact-checked by Sierra Juarez. Planet Money's executive producer is Alex Goldmark.

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Music: Universal Production Music - "Lost Situation," "Pyramid Thoughts," "Vision," and "Growling Sax"; Model Music - "Clockwork Memories"; Audio Network - "Clean Lines" and "Easy Bossa."