Recycling is a process to convert waste materials into reusable material to prevent waste of potentially useful materials, reduce the consumption of fresh raw .
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 .
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 .
