A new record has been set: The world's oldest leather shoe has been unearthed in Armenia. The single piece of leather laced front and back is about 5,500 years old. The shoe, stuffed with grass, was found at an archeological dig in a cave. It is a few hundred years older than the shoes on Otzi the Iceman, the mummy found frozen in the Alps in 1991. A fiber sandal even older than the Armenian shoe was found in Missouri.