The Assyrians were the first to create an anti-depressent. The fumes were inhaled by patients to dispel sorrow or grief.
The Assyrians were the first to develop an effective postal system (or courier system). Letters were written in cuneiform on clay tablets that were three inches square enclosed in clay envelopes. Not all the letters written were about business.
The Assyrians were the first to develop a masonry dam. The dam was created on the Atrush River. The water was channeled into a canel that led to the Capital of Assyria.
The Assyrians were the first to use a library. The library was established by Ashurbanipal, a king, in Ninevah. This library housed information of many southwest civilizations and the first dictionary. The librarians gathered knowlege of their ancestors while working here.
The Assyrians were the first to use iron weapons in war. They were extremely good leaders, and used very effective war tactics. They used terror to their advantage and conquered many.