(Note: Urso originally published this post on November 14, 2011, as part of a collaboration with Expo 2012 Yeosu. We're publishing it here posthumously. The original post can be accessed here) They’re in attics and drawers around the world. They’re also in museums spanning the globe. Each time a world’s fair is held, millions want to grab a piece of history or just preserve a memory. They’re world’s fair souvenirs. It’s hard to imagine a visit to an expo without picking up an