Next week, our last week, we'll look at the many facets of globalization that aren't causes for celebration. But for today, let's just pause to consider how we got from here to here, how the relentless and unquenchable ambition of humans led to a world where the entire contents of the Library of Alexandria would fit on my iPhone, along with recordings of everything Mozart ever composed. In such a world, it's easy to feel that we are big and powerful, maybe even invincible. It's easy to feel that, and also dangerous. Thanks for watching. I'll see you next week. Crash Course is produced and directed by Stan Muller.