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Travel identification has taken many forms over the years, from stone tablets to an exhausting process that involved posting your itinerary on a church door. But how did we arrive at the standardized booklets many of us carry today? How do different countries use art and technology to distinguish their passports? And what’s the best (and worst) passport in the world, according to experts? Plus: Why you can blame a German spy for your embarrassing passport photo.

Got a question or idea for the show? Call our hotline at (302) 405-5925 or email higeniuses@gmail.com.

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