Although only about one person in ten with a positive skin test or blood assay ever develops. TB disease, the risk continues throughout the rest of your life. The symptoms of TB are. common to many other illnesses.
Marco Polo-Great Silk Road. For many centuries the Great Silk Road connected a complex network of trade routes from Europe with Asia. It was a way to establish contact with the great civilizations of China, India, the Near East and Europe.
Marco Polo went with his father and uncle to China because they were Italian merchants and were getting items to sell in Italy and Venice. He was 17 years old when he went with them, but he stayed 25 years before he returned to Venice.