What is persistalis?

What is the completion of 100 years known as? Why did western European economies grow faster eastern European economies after world War ll? What are the 3 major sources of history? Who are the mongols? Is there any roman connection to the months of the year? What is the origin of the name Rodney? What century historians believe the game chess was invented? Who invented cowboy boots? How much was ivory soap in 1950? Who initiated the fourth crusade? When was YouTube first started? Why was there a middle class in the middle ages? What year the first clock invented? What is Caligula's major contributions? Who led the medieval guilds? Did medieval people have sinks? How did the roman look like? How was rome rulled differently when the etruscan king was expelled? What is the Latin for the material that bound the fasces? The year exactly one century before the millennium?