Scientists find hidden 'hotspot' that helped create the Great Lakes before North America even existed Livescience.comScientists discover 300-million-year-old hidden 'hotspot' that created the Great Lakes; where is it... MoneycontrolScientists find evidence that ancient 'hotspot' played major role in formation of Great Lakes Phys.orgScientists Reveal Hidden Secret That Helped Make the Great Lakes Newsweek