Olympic curling: The essential guide

Skip Allison Pottinger of Eden Prairie, Minn., watches team members Tabitha Peterson, left, of Eagan, Minn., and Natalie Nicholson, right, of Bemidji, Minn., sweep the rock during U.S. Olympic Team Trials at Scheels Arena in Fargo, N.D., on Wednesday, Nov. 13, 2013.