All eyes on North Korea as 'Day of the Sun' arrives

North Korea is preparing for its biggest day of the year, and while school children rehearse their routines, the world watches on to see if there could be something a lot more concerning to mark the occasion. April 15 is the 105th anniversary of the birth of North Korean founder Kim Il Sung, the grandfather of Kim Jong Un. It's also day many fear could be accompanied by the country's sixth nuclear weapons test.