LiveScience: The Great Lakes share a surprising connection with Wisconsin's small lakes and aquifers -- their water levels all rise and fall on a 13-year cycle, according to a new study. But that cycle is now mysteriously out of whack, researchers have found.
"The last two decades have been kind of exceptional," said Carl Watras, a climate scientist with the Wisconsin Department of Natural Resources and the University of Wisconsin-Madison.
Water levels have been declining since 1998, Watras told Live Science....