Today, roller skating is easy and fun. But a long time ago, it wasn\'t easy at all. Before 1750, the idea of skating didn\'t exist. That changed because of a man named Joseph Merlin. Merlin\'s work was making m高考资源网usical instruments. In his spare time he liked to play the violin. Joseph Merlin was a man of ideas and dreams. People called him a dreamer. w.w.w.k