Last time we talked about boats and sailing. This time, in part 2, we talk about navigation, or "why it's so hard to get from here to there if you don't have any idea where you are". And even harder if you don't know where you're going.

Along the way we'll meet Genghis Khan, a Norseman and his bird, and someone from Greece who may or may not exist. There's high seas adventure, getting permanently lost, finding stars, bears, needles, and bits of wood. You'd hardly believe we can fit it all into one episode. Which is why next week is part 3.

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