They say a picture is worth a thousand words and a photograph of a shark taken by two teenagers in Massachusetts last weekend certainly tells a story.  This photo taken off Woods Hole on Cape Cod on July 4th shows a great white shark just feet away from Margaret Bowles on a paddleboard - and she didn't know it.

"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.