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 left with is father and uncle for China. It took them 4 years to reach their goal and in that time they had to overcome weather, bandits, ship wrecks, snow storms, floods, miles of desert, mountains, oceans, hostile people, and many other things.