How many years has it been since 1955?

What is common in Eastern Bloc Nations? When did Mongol Empire end? When did slave trading start? What helped unify different people of the roman empire? 3 types of cycle plays during middle age? What refers to present day Asian country -Europeans had long lusted after the riches of polo's cat-hay? Which are the 2 famous monuments of the medieval period? How were the changes that took place in Russia as a result of World War 1 differ from those in western Europe? How many lines were on a musical staff from the medieval time preiod? Why did the europeans begin to explore the western hemisphere? What year is mcmxv11? How old is the Hudson Bay Company? How did Roman emperors try to increase the supply of money at home? Why should Christopher Wren be remembered? What type of clothing does western Europe wear? What are the levels of knighthood? Why was the Third Crusade organized? What is Kublai Khans favorite wife? How have clock changed over time? What was the first organized civilization in history?