what Europeans could learn from contributions made by Islamic civilization,

You are a Muslim scholar living in Cairo in the year 1400, who has just been visited by a traveler from Christian Europe who wants to know more about the contributions Islam has made in religion, art, literature, and science. Write a letter to this traveler in which you explain what Europeans of the time could learn from these contributions made by Islamic civilization, especially as found in such cities as Cairo, Baghdad or Cordoba.