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Curling is a team sport that is popular in many countries around the world, including Canada, Germany, England, and Sweden. This sport involves two teams taking turns guiding a heavy stone ball, or “rock,” across an indoor ice field. Curling was first played in Scotland in the sixteenth century, and early matches were played on frozen rivers or lakes. Today, Scotland still holds many curling events, and it is the home of the World Curling Federation, which oversees the game's regulations.