There's only so much of the liquid to go around The story of civilization can be told simply. Follow the water.
Water is needed to maintain the life of every living cell.
Since human beings cannot exist for more than about three days without it, they have sought reliable sources of water since the beginning of civilization. Back to series Archaeologists have uncovered elaborate systems of gathering and draining water in cradles of civilization in India, Egypt and Iraq. By 305 A.D., a system of 14 aqueducts allowed all residents of Rome to have 50 gallons of fresh water per day. Today, the average New Jersey resident uses about 75 gallons daily at home. Water was the explorers' main thoroughfare.