NASA Tests Power System to Support Manned Missions to Mars
Substance in Toothpaste Could Fight Malaria
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.