"The sharks and the humans are both on the water's edge more frequently in the summer," said Dr. Nick Whitney, senior scientist at the New England Aquarium.

Two teens were taking a photo while paddleboarding off the Cape. They didn't realize a shark entered the picture.

Teenage paddleboarders enjoying the waters in Cape Cod on the Fourth of July had an unexpected — and unwanted — visit from a great white shark. Margaret Bowles told CBS News that she had been paddleboarding with her bestfriend Madeleine Cronin for a few hours near Stony Beach when the terrifying experience occurred.