Police in the St Louis suburb of Ferguson arrested 15 people after fresh protests over a grand jury decision not to indict a white policeman for shooting dead black teenager.
Black Friday kicked off with expectations that lower gasoline prices and higher consumer confidence could mean better year-end retail sales than last year.
A winter storm that wreaked travel chaos across the US northeast wound down, but hundreds of thousands of people were left without power on the Thanksgiving holiday.
DNA molecules attached to the outside of a rocket may be able survive a trip to suborbital space and back into the Earth's atmosphere at extremely high temperatures.
The leaders of the United States and Mexico spoke to discuss President Barack Obama's executive actions to overhaul aspects of America's immigration system.
The painted upright piano that adorned Rick's Cafe in the classic movie "Casablanca" fetched $3.4 million at auction Monday after a frenzied sale in New York.
The family of slain black US teen Michael Brown said they were "profoundly disappointed" by a grand jury's decision not to charge the white police officer.