but constant controlled experimental conditions are extremely difficult to maintain for such long periods of time, especially for experiments as sensitive as this one. the house was also known as the "number ten safe house". barber started learning the violin when he was seven years old. planting of resistant varieties is so far considered the main and most important method for controlling this disease [3]. he is the candidate of political science. the troop ship obeyed and turned back to sea. the plane hits trees and flips upside down, killing 176 of 187 people on board. 