Experts still trying to figure out cause of Saturday's rapid fluctuation in water levelsAlan Auld of Shuniah, Ont., said he stepped out to look at Lake Superior on Saturday and was among people who saw the waters receding — something he compared to the draining of a bathtub. "At first we joked to everyone saying, 'Who pulled the plug?'" said Auld. "To see Lake Superior, the largest freshwater lake in the world, can do something like that, that's quite powerful. So we were in awe." On the east border of Thunder Bay, Shuniah is a municipal township along Lake Superior's...