Antonio R. Villaraigosa, Mayor of Los Angeles, left, greets children at a grade school in the town of Sderot, southern Israel, Friday June 13, 2008. (AP Photo/Tara Todras-Whitehill) Mayor Antonio Villaraigosa left Wednesday on a week-long trip to Israel (the third time during his political career) to learn and bring back security improvements to Los Angeles International Airport and the city's Harbor. He will also be sharing what the city is doing with its......