On this country's 250th birthday, we bring you stories about the most American people, places, objects, and social norms that make this country what it is. Visit thisamericanlife.org/lifepartners to sign up for our premium subscription.

Prologue: Ira talks to Pablo Torre about Major League Baseball’s new challenge system, and how it’s been optimized for maximum drama. (10 minutes)
Act One: Writer Jiayang Fan wrestles with a very common question she has never quite understood. (5 minutes)
Act Two: People come from all over the country to walk down one of Michigan’s tallest sand dunes, and then promptly turn around and trudge back up. Aviva DeKornfeld talks to Americans spending their limited vacation time on this punishing activity. (8 minutes)
Act Three: Emanuele Berry talks to Ira about Season 13 of the reality TV show, Survivor, known to fans as the “race war” season. (8 minutes)
Act Four: Years before his famous dictionary, Noah Webster wrote a book that took on a life of its own and served an unexpected purpose. (8 minutes)
Act Five: Emmanuel Dzotsi investigates a musical phenomenon very particular to the United States: singers embellishing the end of the national anthem. (9 minutes)

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(Updated for each story)