Grass(1999)

Determined to find out the true effects of marijuana on the human body, stand-up comedian and former Stoner of the Year Doug Benson documents his experience avoiding pot for 30 days and then consuming massive amounts of the drug for 30 days. More than just an amusing story of one man's quest to get superhigh, this documentary also examines the hotly contested debate over medical marijuana use.

Echo of the Mountain takes a look at the life and work of Santos de la Torre, a great Huichol artist who, like his people, lives in oblivion. Despite having made a great mural for the metro station Palais Royal – Musée du Louvre, Santos lives isolated and ignored in his country. This documentary follows his pilgrimage to Wirikuta, where he asks gods for permission to make a new mural; his journey across 385 miles of the Peyote Route, and Santos's creative process during the making of a new mural which aims to illustrate the history, mythology and religious traditions of the Huichol people.

Zombies are part of pop culture, but what are they? Where do they come from? To find real zombies we visit Haiti where Zombies are an integral part of the island's cultural and religious roots.

After 20 years seeking Cleopatra's tomb, archaeologist K. Martinez's search shifts to an underwater Mediterranean site. She's joined by Titanic finder Bob Ballard, Egyptian Navy and dive teams to explore the location.

Denise Crosby takes a first look at the huge fans of "Star Trek" from around America and how the series has affected and shaped their lives.

Puentes de Salud is a volunteer-run clinic that provides free medical care to undocumented immigrants in south Philadelphia. Here, doctors and nurses work for free to serve people who would otherwise fall through the cracks. Clinica de Migrantes, a potent film by Maxim Pozdorovkin, follows the workers and patients of Puentes through months of routine care and growth. Along the way, the film puts a face to the millions of people who exist on the margins of society: people displaced from their homelands, separated from their families, unfamiliar with the customs, unable to obtain health insurance and terrified to come forward to seek medical help. Along with revealing these patient stories, Clinica is also a look at the heroic doctors and nurses who work pro bono to ensure these people receive care, offering a deeply moving look at the limitless potential of humanity.

In the 1920s, former coal miner Harry Hoxsey claimed to have an herbal cure for cancer. Although scoffed at and ultimately banned by the medical establishment, by the 1950s, Hoxsey's formula had been used to treat thousands of patients, who testified to its efficacy. Was Hoxsey's recipe the work of a snake-oil charlatan or a legitimate treatment? Ken Ausubel directs this keen look into the forces that shape the policies of organized medicine.

King Corn is a fun and crusading journey into the digestive tract of our fast food nation where one ultra-industrial, pesticide-laden, heavily-subsidized commodity dominates the food pyramid from top to bottom – corn. Fueled by curiosity and a dash of naiveté, two college buddies return to their ancestral home of Greene, Iowa to figure out how a modest kernel conquered America. With the help of some real farmers, oodles of fertilizer and government aide, and some genetically modified seeds, the friends manage to grow one acre of corn. Along the way, they unlock the hilarious absurdities and scary but hidden truths about America’s modern food system in this engrossing and eye-opening documentary.

Though Henry Kissinger is often giving short statements to the media, he refuses detailed interviews about his own life. Now he has agreed to answer questions about his person in an extensive documentary.

A documentary that takes an in depth look at a government sanctioned art school in Cuba and its students. Interviews of various artists attending the school allow viewers a glimpse into their personal and professional lives.

In 2011, Maine State Prison launched a pioneering reform program to scale back its use of solitary confinement. Bafta and Emmy-winning film-maker Dan Edge and his co-director Lauren Mucciolo were given unprecedented access to the solitary unit - and filmed there for more than three years. The result is an extraordinary and harrowing portrait of life in solitary - and a unique document of a radical and risky experiment to reform a prison. The US is the world leader in solitary confinement. More than 80,000 American prisoners live in isolation, some have been there for years, even decades. Solitary is proven to cause mental illness, it is expensive, and it is condemned by many as torture. And yet for decades, it has been one of the central planks of the American criminal justice system.