Final poll shows Gov. Scott Walker leading in Wisconsin
Scientists generate human stomach tissue using stem cells
North Korea turns down South's invitation to meet Oct. 30
Poll: Joni Ernst gains a couple of points in Iowa Senate race
WHO: Ebola cases slowing in Liberia
Guy Scott to be first white leader of African state since apartheid
Day after mine collapse in Turkey, 18 still trapped
World Bank: best country for business is Singapore
Ferguson, Mo., police chief says he's not quitting
Rocket headed for space station explodes after liftoff
Russia denies pressuring U.S. diplomats, despite State Department claims
Canada 'impressed' with Keystone XL vetting
'King Cobra,' President of Zambia, dies at 77
India, Vietnam eye gas in disputed South China Sea