It's that time of year again - when it becomes clear we're not alone in the water.  And two recent shark attacks are an unsettling reminder of that.

First came an incident at Nauset Beach in Orleans last Monday when a bloody scene - a shark attacking a seal - sent crowds running. Then, just days later in Wellfleet, a local surfer was hitting the waves when something in the waves hit back. 

No one was hurt in either attack, but both incidents had a lot of people thinking twice about jumping back into the water. One official on Cape Cod even floated the idea of capturing and killing all great whites swimming near beaches, though he has since backed off the plan. 

Brian Skerry, a resident shark expert, author, and National Geographic photographer joined Adam Reilly to discuss whether people should be worried about sharks or if they should be worried about us.