sticking to my winter sports theme of the night, id like to talk to you about curling. by sweeping the ice in front of the stone, they are removing the ice chips and heating the ice which creates a thin layer of water. this allows the stone to move further because it is decreasing the amount of friction the stone is experiencing. once they get close to the target they stop sweeping, which in turn increases the friction, hopefully enough for it to land on the bullseye.
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