The Mayo Clinic

Friedrich Engels and Karl Marx formed one of the most famous duos in world history. In contrast to Marx, however, Engels seems to have fallen into oblivion today. Unjustly so. Moving archive images, documentary footage and graphic novels lead us back to the time of Friedrich Engels, who shaped the Communist movement like no other.

Sonia Reich- who survived the Holocaust as a child by running and hiding, suddenly believes that she is being hunted again, 60 years later.

This documentary examines theories behind the creation of gamma ray bursts, destructive explosions in space that can wipe out entire star systems.

A documentary on Al Gore's campaign to make the issue of global warming a recognized problem worldwide.

Regular opening times do not apply as we accompany Sir David Attenborough on an after-hours journey around London’s Natural History Museum, one of his favourite haunts. The museum's various exhibits come to life, including dinosaurs, reptiles and creatures from the ice age.

This PBS documentary explores depression, a debilitating disease that affects millions of Americans. Touching the lives of people from diverse backgrounds, depression still carries a stigma that causes some sufferers to go without treatment. Real people with depression talk about their experiences, and scientists offer commentary to shed light on the disease, including its diagnosis, treatment and current research.

Prof. Jim Al-Khalili tackles the biggest subject of all, the universe. Through a series of critical observations and experiments that revolutionised our understanding of our world Jim guides us through the greatest cosmic detective story of all. He takes us from the beginning of the universe to the end time and answers the question: where did the universe come from and how will it end?

Five million Americans suffer from Alzheimer's disease and dementia—many of them alone in nursing homes. A man with a simple idea discovers that songs embedded deep in memory can ease pain and awaken these fading minds. Joy and life are resuscitated, and our cultural fears over aging are confronted.