Judy Garland in the 1939 classic film "The Wizard of Oz,” as well as the design of a special display case to slow the fading and preserve the slippers for future generations. The slippers have been on display since 1979 at the Smithsonian’s National Museum of American History . The results of this research shed new light on the slippers’ materials and construction. In 2018, the Federal Bureau of Investigation recovered what they believed to be another pair of slippers, stolen in 2005 from the Judy Garland Museum. The FBI reached out to MCI scientists and NMAH conservators for their expertise.