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 was an explorer and merchant from Italy.    Marco Polo began his long experience with Cathay (China) through  the adventures of his father, Niccolo, and hisâ¦ uncle, Maffeo Polo,  partners in a trading operation at a time when Venice was the world  leader in foreign commerce.