Dave Davies

One-third of American today are obese, and another third are overweight. A new HBO documentary series, The Weight of the Nation, explores how our country got this way and what can be done to tackle the growing national health crisis.

Two reporters for The New York Times detail their monthlong investigation of America's racetracks. Since 2009, more than 6.600 horses have broken down or showed signs of injury at U.S. racetracks, a rate much higher than in other countries.

Filmmaker Alastair Fothergill spent three years in Western Africa, following a group of wild chimps. His Disneynature film Chimpanzee showcases a baby chimp named Oscar and the relationships he develops within his clan.