You know what that is.

An ice cold beer.

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Cheers to that. Budweiser, Lackenosa. Best enjoyed with your best butts.

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Please drink responsibly.

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Welcome to the History Extra podcast, fascinating historical conversations from the makers of BBC History Magazine.

Each ocean voyage through history has laid down a track that tells a story.

These invisible pathways across the seas can reveal how the world has been shaped by power,

conquest and exploration. Dr. Sarah Caputo explores how lines on a map can have consequences in

the real world in her new book, Tracks on the Ocean. And Ellen Evans spoke to her to find out more.

Sarah, thank you so much for joining me on the History Extra podcast to talk about your new book,

Tracks on the Ocean. Thank you. It's my pleasure to be here. Could you introduce for our

listeners then this concept of the tracks that you're talking about and bring them into this

idea that you've written about in this book? How can we understand that tracks are laid on water? So the book is about the journey

tracks that we leave on the world. So this idea that we imagine our movement across the world as a

line. And my question was, where does this idea come from? Because we take it for granted, right, when we open any map app or Google, that our trip, our movement is represented as a line on the world.

But in reality, this is not a natural way of imagining our movement across the world.

...