Watch
Season 4, episode 11. This player now records resume state for the active profile so browse, account, and detail pages can bring you back here quickly.
Currently watching
Cancer - The Search for the Virus
In this the first of two programmes dealing with cancer, Horizon looks at the intensive search now going on to discover whether a virus is one of the causes of cancer in humans and at the implications of this search in the treatment for such killer diseases as leukemia.
Watch state
Watch history and continue watching stay tied to your active profile, so you can pick up later from browse, account, and detail pages.
Provider validated
Cast And Share
These providers run inside an external iframe, so the most reliable casting flow is to open the player in its own tab and use your browser or device cast controls there.
Episode 1: Sons of Cain
Episode 2: When Is a Body Dead? / How to Win Friends and Influence People
Episode 3: How Best to Make a Man / How Best to Make a Scientist
Episode 4: Dynamo - The Life of Michael Faraday
Episode 5: Migraine
Episode 6: How Safe Is Surgery?
Episode 7: Sleep and Dreams
Episode 8: The Shape of War to Come
Episode 9: Memory
Episode 10: Masters of the Desert