 As an overlooked part of history, they played instrumental roles in significant American turning points—from the Civil War, Gold Rush and San Francisco Earthquake to the Depression, Civil Rights Movement and Hurricane Katrina.An adjoining installation features the history of a group of California sisters who came to San Francisco in 1872 and became pioneers in quality, affordable child care in 1878, long before its existence today.Open January 24 through June 3, 2012.