7 of 15: A truck drives in near whiteout conditions past a silhouette of a moose, on Interstate 80 near Gretna, Neb., Thursday, Feb. 21, 2013. Much of the nation's heartland is experiencing heavy snow, treacherous roads as potentially dangerous winter storm pushed eastward out of the Rockies. (AP Photo/Nati Harnik) (AP Photo/ Nati Harnik)

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