Curling is team sport played on a ice surface called curling sheet with a target at each end of the sheet. Each team is composed by four players, sliding heavy round polished granite stones towards the house (the center of the target) and preventing the opposing team from approaching.
Players who are not sliding the stones (sweepers) use brooms to alter the state of the ice in front of it, in order to influence its trajectory.
This winter sport is very popular in Canada and in Scotland (where it was born). It became an Olympic sport in 1924 and nowadays it is played in Italy as well, with two curling centers and many sheets on the Dolomites.