'Doomsday Clock' closest to midnight since Cold War

Scientists moved ahead by half a minute the symbolic Doomsday Clock, saying the world was at its closest to annihilation since the height of the Cold War due to world leaders' poor response to threats of nuclear war.

Obama arrives in Cuba to begin visit in thawing of ties

US President Barack Obama arrived on Sunday in Cuba, in a historic visit that could mark the beginning of a new era in US relations with its neighbor after more than 50 years of Cold War-era animosity.