How did a couple's holiday save Kyoto from certain ruin? How did a landslide contribute to the Revolutionary War? Basically, how have chance encounters and decisions influenced the history of the United States?

Don is joined for this episode by Brian Klaas, author of 'Fluke: Chance, Chaos, and Why Everything We Do Matters'.

Brian is a political scientist, a contributing writer at The Atlantic, and an associate professor in global politics at University College London.

Produced by Sophie Gee. Edited by Nick Thomson. Senior Producer was Charlotte Long.

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All music from Epidemic Sounds/All3 Media