Article Photos: Shuttle crossing provides a unique teaching moment 3/7

  Hildreth "Hal" Walker Jr., a retired laser scientist, holds a inflatable space shuttle Endeavour while teaching his students at an after-school center in Inglewood, Calif., Wednesday, Oct. 10, 2012. When the space shuttle Endeavour makes its road trip to its retirement home through working-class communities in Los Angeles County, Walker Jr. wants the children he tutors to remember a few names: Ronald McNair. Mae Jemison. Charles Bolden. A retired laser scientist who had a role in the Apollo 11 mission, Walker is trying to use the shuttle's two-day terrestrial crawl through predominately African-American and Latino communities to highlight the role that minorities played in the shuttle program. (AP Photo/Jae C. Hong)