What is a crtstallization?

Who made there clothers in medieval time? What did the Enlightenment had its origins in what earlier event in Europe? Housing of the 1600's? Who created the Roman mob? How would you say You are... in Middle Ages? Why is gold and silver important in Europeans? Who created a vast network of roads to link the ancient Roman empire? What are some Long term causes of the scientific revolution? When the Romans conquered Judah they renamed it what? Meaning of Charlemagne name? What did Otto van Bismarck use to promote Germany unification? Who are the Indians of the west? What forced Europeans to look for other routes east? Why did christian practices develop differenty in the eastern and western empires? Who were the two junior emperors or Caesars that took over as co-emperors when Diocletian and Maximian stepped down in 305 AD? Why is it the 21st centry and not the 20th? How has the invention of the toilet improved life? Why did settlers move to the west in the 1840s? How many casualties did the Christians experience in the crusade? What is eroishion?