NASA Tests Power System to Support Manned Missions to Mars
US Gymnastics Officials Asked to Resign After Abuse Scandal
South Korean Tennis Player Defeats His Idol, Novak Djokovic
Amazon Go: First Store with No Money or Lines
Syria, Russia Accuse US of Lying about Chemical Weapons Attacks
Russian-Linked Twitter Accounts Not Done with US Government Shutdown
Artificial Intelligence Beats Humans in Major Reading Test
Report: US Is Largest Source of Illegal Guns in Brazil.
US Government To Reopen After Three Day Shutdown.
Most Large US Public Colleges Fail to Keep Records on Suicides.