Recycling is a process to convert waste materials into reusable material to prevent waste of potentially useful materials, reduce the consumption of fresh raw .br Sawmills seem to have existed in the medieval period, as one was sketched by Villard de Honnecourt in c.1250.[2] On the other hand people think they were .br br Rapid transit, also known as metro, subway or underground is a type of high-capacity public transport generally found in urban areas.[1][2][3] Unlike buses or .