chief operating officer ps finance. tamba aghailas. class of 2006. director, the voice of liberia from different walks of life many of our students exceed in different ways. yet their first step is exactly the same berkeley college. . captioning sponsored by macneil/lehrer productions >> woodruff: a second american journalist appears to have been executed by islamic state militants, who threatened more to come if the u.s. doesn't back off. good evening, i'm judy woodruff. gwen ifill is away. also ahead this tuesday, are health care workers losing the battle to stop the spread of ebola in west africa? we talk to the head of the u.s. centers for disease control who says the outbreak is "spiraling out of control." then, the cyber-theft of celebrities' private photos prompts questions over just how secure personal information is online. plus, a woman's mission to give china's abandoned and often neglected orphans a sense of