In economics, paper greatly contributed economically during Islam's Golden Age. The Chinese paper making process was more efficient than parchment or papyrus. In politics, Abbasid armies expanded. Arabic was the official language of the empire and as the number of people under Islamic control grew, more people learned it. In social aspect, Al-Ma'mun founded The House of Wisdom in Baghdad.In intellectual part, Al-Razi, a skillful surgeon, is the most well-known of the doctors during Islam's Golden Age.