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The High-Tech Features That Make Passports Secure

The flimsy pages and patriotic designs betray just how many security measures are hidden inside.
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Thomas Peter/Reuters

This post is part of a CityLab series on borders—both real and imagined—and what draws so many of us to places on the edge.

On its face, a passport is little more than a booklet barely the size of a greeting card. But it’s a powerful tool, facilitating movement across borders, and for some, serving as the most reliable proof of identity and nationality.