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.
The route taken by the Polos became known as The Silk Road. Kublai Khan and his royal court immediately took a liking to Marco and appointed him commissioner in the Mongol government. In the meantime, Marco studied the native languages and culture.