How is flint created?

Who was the man that brought down the roman empire from the inside? Among the important forces that first stimulated European interest in trade and discovery was? Who invented dresses? Who was involved in the Third Crusade? What was Zebulon Pike's western route? What was Camelot like? Who were the crusaders enemies? How long did it take to invent the wheel? When did the renaissence begin? Did medieval people have sinks? How was slavery in West Africa different from later slavery in the Americas? Where did the mohawk come from? Who was the Italian who traveled to China to the court of Kublai Khan in the 1200s? How did circumcising start? Was a large plantation a characteristic unit of western agriculture? Where do pattern appear in some Medieval Japanese paintings? What is the movie Spartacus about? Who invented the toilet and when? What century is 1161 in? What is the origin and country of origin of the surname Cartwright?