Answer:
The invention that propelled the spread of learning throughout the Islamic world is Paper.
This invention helped them to write.
Step-by-step explanation:
Islam: Empire of Faith is a broadcasted series, that came out in 2000 and picturized the details of Islamic empire, from birth of Muhammad to the rise of Ottoman Empire.
In this series, the invention which is considered to be the invention that contributed in the spread of learning throughout the Islamic world is the invention of paper. When Islam conquered Central Asia, they came in proximity with paper. They learned how to make papers and soon became the most used and sold products in all parts of the society, from government to citizens.
This invention was effective in a way that it helped people to write. Paper became an important product as it helped to secured documents from being forged or erased. In the middle of the ninth century paper was widely used hundreds of Paper factories were built in Baghdad.