Osteoarthritis (OA) . OA is the wear-and-tear arthritis that usually occurs with aging or after injury. With OA, there's a wearing down of the cartilage that cushions the ends of the bones. OA causes joint swelling in those joints that bear weight over a lifetime, such as knees, hips, feet, and spine.
During the Zhou dynasty, the Chinese developed irrigation and flood- control systems. As a result, farmers could grow more crops than ever before. Because more food could support more people, the population increased. During the late Zhou dynasty, China's population had expanded to about 50 million people. Zhou people also learned to use iron, which was cheaper and stronger than bronze. Iron weapons, the catapult and China's first cavalry (military on horseback) were some of the Zhou achievements that helped strengthen the army.
Many of the inventions made during this time make our every day life possible. Below is a list of some of the most important. slide 1 of 1. The Industrial Revolution was the period of time during the 18 and 19 centuries when the face of industry changed dramatically.These changes had a tremendous and long lasting impact on the economies of the world and the lives of the average person. There were hundreds of inventions during this time period.elow is a list of some of the most important. slide 1 of 1. The Industrial Revolution was the period of time during the 18 and 19 centuries when the face of industry changed dramatically. These changes had a tremendous and long lasting impact on the economies of the world and the lives of the average person.