aztecs

How Egypt's Pyramids Work

Pyramids can be found in ruins around the world, but no civilization perfected the feat of engineering like Pharaonic Egypt. Learn about the mysteries that still surround these giants.

How Currency Works

Even if you entirely eschew the concept of money, we'll bet you'd be hard pressed not to trade in some form of currency. Learn how everything from cows to cacao beans to tiny shells from Maldives have served as currency at some time or another.

How Chocolate Works

People have been consuming chocolate for at least a couple thousand years, but it's only been in the last hundred that humanity has arrived at its crowning achievement: the smooth, creamy milk chocolate bar. Find out about the history of chocolate, how it's made and how it affects your mood in this episode.