Conservation and restoration at the Smithsonian Institution deals with the care of the 138 million artifacts located in the collections of Smithsonian Institution. Work is conducted by one research center, the Museum Conservation Institute (MCI), and by conservators at the Smithsonian's museums, galleries, zoo. Smithsonian conservators provide myriad services to their units, including exhibit preparation of the museum collection and loan objects,[1] advising on object care,[2] training for future generations of conservationists,[3] engaging in routine preventive care on a daily basis,[4] conducting research projects related to the collections,[5] and examining objects for evidence of manufacturing techniques and previous restorations[6] All conservation labs collectively further the mission of the Smithsonian Institution, "the increase and diffusion of knowledge."[7] Founded in 1846 the Smithsonian is the world's largest museum and research complex, consisting of 19 museums and galleries, the National Zoological Park, and nine research facilities.[8][9]