During World War II, while the (mostly) white men were fighting, American women and African-Americans of both genders were on the homefront, building planes, tanks, ships, and other hardware. Rosie the Riveter is a fictitious worker who represents women's contributions to the war effort. Last weekend, the National Park Service opened the Rosie the Riveter Museum on the Richmond (California) waterfront. Four shipyards there produced over 700 ships during the war. In a contest between the yards, a Liberty ship was finished in 4 1/2 days. The social experiment forever changed the nation's attitudes toward women and minorities.