 A corporate official at Centerpoint Energies defended the company's response. The company had an especially dangerous time with the National Weather Service issuing a heat advisory and describing conditions as potentially dangerous given the lack of power and air conditioning. Climate change is making events like this more common. At least six people have been injured in shark attacks in the U.S. since July 4th. As NPR's Joe Hernandez reports, shark bites are extremely rare, but experts have some tips for staying safe in the water.