This mutli-award winning film exposes the little-known environmental and health costs of the dirty oil that would flow through the proposed Keystone Pipeline. Canada is the number one foreign supplier of oil to the United States. Most of the oil imported comes from the Tar Sands of Northern Alberta, the second largest known oil reserve in the world outside of Saudi Arabia. But this is not a traditional oil field. The oil must be extracted and processed...

In the second episode of Ken Burns's DUST BOWL, experience the gradual relief as the families of the plains seek new lives in California and government conservation efforts - and a break in the drought in 1939 - eventually stabilize the soil and bring the farms back to life, but with dangers of another Dust Bowl facing future generations.

By the late 1880s, the buffalo that once numbered in the tens of millions have been reduced to fewer than 1,000 and teeter on the brink of extinction. But a diverse and unlikely collection of Americans have started a few private herds in different locations--and for different reasons. In the early 1900s, their efforts grow into a movement that rescues the national mammal from disappearing forever.

Country music adapts to the cultural changes of post-war society. Bill Monroe and Earl Scruggs transform string band music into Bluegrass. Out of the bars comes a new sound and songs about drinking, cheating, and heartbreak: Honky Tonk.

In Resilience, the second episode of Hiding in Plain Sight, our "heroes" speak about finding help, inpatient and outpatient therapy, the stigma of racial or gender discrimination, the criminalization of mental illness, and youth suicide.

Vietnamese revolutionaries led by Ho Chi Minh end nearly a century of French colonial occupation. Vietnam is divided in two. Communists in the North aim to reunify the country, while America supports Diem's untested regime in the South.

North Vietnamese troops and materiel stream down the Ho Chi Minh Trail into the South. As an antiwar movement builds back home, soldiers and Marines discover that the war they are fighting in Vietnam is nothing like their fathers' war.

While the Watergate scandal rivets Americans' attention, the Vietnamese continue in a civil war. When North Vietnamese troops pour into the South, Saigon collapses. For the next 40 years, all sides search for healing and reconciliation.

As country music's popularity skyrockets, the genre confronts the question of whether it can also stay true to its roots. The success of the "New Traditionalists"-Reba McEntire, Randy Travis, the Judds, and Dwight Yoakam-suggests it can.