The printing press
Movable type printing was introduced to Europe by Johann Gutenberg in the mid-15th century. This technological advance made it possible for a reformer like Martin Luther to spread his ideas widely and rapidly. While overall literacy rates were low at that time, it was common for people to gather for reading of the latest Reformation materials. Hundreds of thousands of copies of tracts written by Luther were printed and distributed -- as well as similar spread of ideas by publishing done by other reformers.
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<span>Darius was the first to use standardized coinage. By doing this, it gave the entire empire a common currency, which made it easier to undertake trade and commerce. With the ability to standardize commerce, the empire and all its cultures could be brought together easier.</span>
