Cuban Protests, Shark Week, Hidden Likes

What led to the historic protests in Cuba? Then, another "Shark Week" just wrapped up on the Discovery Channel, but the publicity sharks receive may not be helping the fish. And, why Instagram's big feature change may not help the people who need it most. Also, on today's show: A former gymnastics world champion makes a comeback; how much schools could surveil students; there’s some promising new research in search of treatment for type 2 diabetes.