Morning stiffness is often an early sign of arthritis. Stiffness that lasts for a few minutes is usually a symptom of a degenerative form of arthritis. Stiffness that lasts for several hours is generally a symptom of inflammatory arthritis and is typical of RA.
Early cities developed in a number of regions, from Mesopotamia to Asia to the Americas. The very first cities were founded in Mesopotamia after the Neolithic Revolution, around 7500 BCE. Mesopotamian cities included Eridu, Uruk, and Ur. Early cities also arose in the Indus Valley and ancient China.
The first urban societies: From the year 3000 BC , cities grew enormously and their population consisted of thousands of people. Life in these cities became more complex and it was necessary to make a division of work. Each person was dedicated to a specific job and got all his other needs at the market.