A great white shark is attracted by a lure on October 19, 2009 in Gansbaai, South Africa. (Getty Images)
(CNN) – Some are calling this the "summer of sharks." Great whites have been spotted close to shore on Cape Cod and New Jersey, forcing beaches to close. Andy Dehart is a marine biologist and shark adviser for the Discovery Channel. He joined us on Tuesday's American Morning to explain our fascination with the great white shark. Watch 