489 Sarah Vowell American Hawaii; Rick Mercer Canada 150; Winning the Palio

Author and This American Life contributor Sarah Vowell tells us what she's recently learned about the Americanization of the Hawaiian islands. Then say "Happy 150th birthday" to Canada with one of its top TV personalities, Rick Mercer. Plus, a tour guide from Siena tells us how her adopted neighborhood won last year's Palio horse race — twice.

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