A little over six years ago, hedge fund manager Sal Khan began tutoring his cousins long distance, with the help of a speakerphone and Yahoo Doodle software. By 2006, his tutorials had taken the form of YouTube videos, which Khan made free to anyone who wanted them. Today, people watch Khan’s 1,800 tutorials � which […]
International investigators ask which groups or nations may have bought electronic blueprints for an advanced nuclear weapons. Plans for a small nuke were found on the computer network of rogue Pakistani nuclear scientist Abdul Qadeer Khan.