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.
carried messages from the Pope, the elder Polos took along young Marco, who was then seventeen. Many years later, Marco Polo, with the assistance of a romance novel writer, composed a book entitled The Travels of Marco Polo, or, A Description of the World. If the book is to be believed, Marco Polo spent seventeen years in China, during which time