On June 14,2013 SpaceX's Grasshopper flew 325 m (1066 feet)--higher than Manhattan's Chrysler Building--before smoothly landing back on the pad. For the first time in this test, Grasshopper made use of its full navigation sensor suite with the F9-R closed loop control flight algorithms to accomplish...

Despite ramped-up security efforts in anticipation of the 2014 Winter Olympics, concerns persist over terrorist threats facing the games. CFR Distinguished Visiting Fellow Raymond W. Kelly highlights three things to know about the threats and response preparedness in Sochi:
0:33 - A Restive Region:...