describe and explain the importance of Roman technology and engineering, especially as it related to making its giant cities livable. Cover at least two separate kinds of Roman technology and/or engineering.
Roman technology is the engineering practice which supported Roman civilization and made the expansion of Roman commerce and Roman military possible over nearly a thousand years, [ if we include the Byzantine Empire.
The Roman Empire had the most advanced set of technologies of its time, some of which was lost during the turbulent eras of Late Antiquity and the early Middle Ages. Gradually, some
of the technological feats of the Romans were rediscovered and/or improved upon, while others went ahead of what the Romans had done during the Middle Ages and the beginning of the Modern Era. Several Roman technological feats in different areas like civil engineering, construction materials, transport technology, and some inventions such as the mechanical reaper, were surprising achievements until the 19th century, and some, such as the arch, have remained untouched to this day. It should be noted that the Romans achieved high levels of technology in large part because they borrowed heavily from and absorbed the culture of the established Hellenised people of the Mediterranean basin.The Roman military technology ranged from personal equipment and armament to deadly siege engines. They inherited almost all ancient weapons.
While heavy, intricate armour was not uncommon (cataphracts), the Romans perfected a relatively light, full torso armour made of segmented plates (lorica segmentata). This segmented armour provided good protection for vital areas, but did not cover as much of the body as lorica hamata or chainmail. The lorica segmentata provided better protection, but the plate bands were expensive and difficult to produce and difficult to repair in the field. Overall, chainmail was cheaper, easier to produce, cheaper and simpler to maintain, was one-size fits all, and was more comfortable to wear – thus, it remained the primary form of armor even when lorica segmentata was in use.
The Roman cavalry saddle had four horns  and was believed to have been copied from Celtic peoples.
Roman siege engines such as ballistas, scorpions and onagers were not unique. ]
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