Just as today we're making subtle, irrevocable decisions that people of the future will remember as revolutions. Next week we're going to journey to the Indus River Val- whoa. It's very fragile, our globe. Like the real globe. We're going to travel to the Indus River Valley. I'll see you then. Crash Course is produced and directed by Stan Muller, our script supervisor is Danica Johnson, the show is written by my high school history teacher Raoul Meyer and myself, and our graphics team is Thought Bubble.