by Maryam Hussain By the time of the Roman Empire, humans had created such amenities as indoor plumbing, iced desserts, textiles and leather shoes, dyed clothes, etc. Concrete, chains, solder, and hand tools for working wood and stone were part of the craftsman’s kit, while horses pulled light carts and chariots. In about 5000 B.C., the horse was employed for domestic services somewhere between Ukraine and the Caucasus Mountains of central Asia. In about 2000 B.C., humans started to ride horses. Horseback riding represented a major revolution in technology, with dramatic effects, particularly in warfare. Horses had to be bred larger to carry a person, and the practice seemingly grew up first among nomadic tribes that herded horses in central Asia, including what is now Iran and Afghanistan. Some of the great conquering peoples of central Asia, including the Huns and the Mongols, achieved their victories via the horse-mounted cavalry soldier. Researchers had not only master...
Process Constraints and Optimization, Mass and Energy balances of process, Converters development, Assignments writing.