Conversation so far:
upon what type of economic activity were the economies of the islamic empires based
Early forms of proto-capitalism and free markets were present in the Caliphate and early form of merchant capitalism developed between the 8th and 12th centuries.
How far did trade reach in early Islamic empires?
During the Islamic Golden Age, isolated regions had contact with a far-reaching Muslim trade network covering most of the Old World.
What was the Islamic Golden Age?
The Islamic Golden Age was a period of cultural, economic and scientific flourishing in the history of Islam, traditionally dated from the 8th to the 14th century.
How did the Islamic Golden Age end?
The destruction of Baghdad and the House of Wisdom by Hulagu Khan in 1258 has been seen by some as the end of the Islamic Golden Age.

Question: can you tell me a scientific achievement of the age
Self-contained rewrite: can you tell me a scientific achievement of the Islamic golden age