Romans enineers built roads, bridges, aqueducts, sewers, fortifications and ports.
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During the Pax Romana, he promoted Christianity even though he was a Pagan.
The ballistas were crossbow-like catapults. They helped the Roman army. They were the artillery of antiquty.
An empire is not a person. Therefore, the Roman Empire did not invent anything. The Romans invented concrete. Roman concrete was different from modern concrete. It was more fluid and had to be layered by hand. It was just as strong.
Laws were one of the factors that gave the empire unity. Since all provinces and territories were ruled by Roman law, the laws were the glue that held the empire together.
Although, the Romans did little original research, they did put science into practical use. They applied geography to make maps and medical knowledge to help doctors improve public health.