"Standardized earthenware plumbing pipes with broad flanges making use of asphalt for preventing leakages appeared in the urban settlements of the Indus Valley Civilization by 2700 BC. Plumbing originated during the ancient civilizations such as the Greek, Roman, Persian, Indian, and Chinese civilizations as they developed public baths and needed to provide potable water, and drainage of wastes.
Improvement in plumbing systems was very slow, with virtually no progress made from the time of the Roman system of aqueducts and lead pipes until the 19th century. Eventually the development of separate, underground water and sewage systems eliminated open sewage ditches and cesspools."
"The seeder plow, invented by the Mesopotamian, was a major technological achievement. It revolutionized agriculture by carrying out the tasks of seeding and ploughing simultaneously. Seed was dropped down the middle funnel into the furrow that the plow created. The ancient Mesopotamian believed that the god Enlil created the seeder plow and that the image of the plow could also be seen in the stars. They discovered that by observing the movements of celestial bodies they could measure time, which was key for planting crops.
Their astronomical observations still aid today's scientists."