Hallucinogenic drugs, popularly called psychedelics, have been used by human societies for thousands of years. Today, scientists are taking a second look at many of these mind-altering substances, both natural and synthetic, and discovering that they can have profoundly positive clinical impacts, helping patients struggling with a range of afflictions from addiction to depression and PTSD.

Looks at the history of marijuana in America, particularly its medicinal purposes and legalization. Includes interviews with experts and celebrities on both sides of the debate

Stem cells are fundamental to biology. In the course of embryonic development, stem cells generate all the specialized cells that populate body tissues like muscle, the nervous system, and blood. In adults, reserves of stem cells repair and regenerate tissues damaged by disease and wounding. Because of the potential of stem cells to generate fresh, healthy cells, there is a huge interest in cultivating them to treat various diseases. This year's Holiday...

An award winning team including Ward Serrill (The Heart of the Game, Miramax), editor Eric Frith (Eden), New York Times animator Drew Christie and Betsy Chasse (co-creator of What The Bleep Do We Know?!) present the extraordinary life of Tom Kenyon, a country singer turned brain scientist and sound shaman. Song of the New Earth follows Kenyon's journey from the stage on Broadway, to giant caves in the south of France, the golden-chandeliered symphony...