On a trip to Washington, D.C., Bridget and Ryan take this question from Oliver in Illinois: Why do different countries use different currencies? There’s the U.S. dollar, the Mexican peso and Japanese yen, just to name a few. This week, we’ll explain why so many countries decided to make their own type of money. And we meet the ghost of Alexander Hamilton, who has an important money lesson to share … through song. For a special cartoon, discussion questions and tips for parents, check out our website! This episode is sponsored by Greenlight.  (For a limited time, get $10 when you sign up for a Greenlight account at greenlight.com/MILLION).