Curling, which originated in Scotland, is a winter sport played on a rectangular sheet ice with large heavy, polished granite stones. Curling is an Olympic winter sport, but many people still don’t understand it. It was originally an outdoor sport, but is now played indoors on specially-prepared ice, and played around the world. It is not as simple as it seems. Some people refer to curling as ‘‘chess on ice’’, based on its technical and strategic requirements. It is a team sport, played by two teams of four players. Teams take turns sliding the stones down the ice towards the target. Two sweepers with brooms also accompany each stone to help direct them. When required, the sweepers vigorously sweep the ice, which melts the ice for a moment, reduces friction and can affect the path of the stone.