A US weapons lab on Friday pulled back the curtain on a super laser with the power to burn as hot as a star. The National Ignition Facility's main purpose is to serve as a tool for gauging the reliability and safety of the US nuclear weapons arsenal but scientists say it could deliver breakthroughs in safe fusion power. "We have invented the world's largest laser system," actor-turned-governor Arnold Schwarzenegger said during a dedication ceremony attended by thousands including state and national officials. "We can create the stars right here on earth. And I can see already my friends in...