This episode of Horizon is about symbiosis - the close association between two or more species for their mutual benefit.

Horizon reports on the country of Tanzania, a country that spends only one dollar per person on health services, and more than half of all children born there die before the age of five.

This episode of Horizon explores what actually happens inside our bodies using new optical techniques.

Horizon examines the projected expansion of the coal mining industry.

In this episode of Horizon, we look at the need for confidence in the doctor to patient relationship.

Horizon investigates the mysterious Bermuda Triangle.

Horizon traces back the origins and development of the pre-Incan Chimu civilization of Peru.

This documentary by Horizon takes a look at the shark, the supreme predator of the sea.

Horizon reports on enzymes and the way they are being put on work in the industry and medicine fields.

This is a Horizon reconstruction of the trial of Dr. Kenneth Edelin who was arrested after performing an abortion in 1973.

This Horizon reports is about Margaret Mead, who at age 74, is one of America's most influential social scientists.

Horizon investigates the developments in and the treatment of schizophrenia.

This report by Horizon investigates the aggressive and oppressive history of the Mescalero and Chiricuhua Apache Indians of New Mexico in the USA.

This Horizon documentary investigates the ways that the blind and partially blind are aided.

Horizon explores the comparative research study into progressive versus formal primary school teaching in the UK.

This episode of Horizon delves in the research into the causes for, and the methods of eradicating 'cot deaths' in Britain.

Horizon looks at food production in Peru today.

This is a Horizon documentary on how a widow faces the last day of her husband's life and the story of three other people who know they only have a short time to live.

Horizon investigates a local authority residential home in Wandsworth, Britain, for emotionally disturbed children.

In the episode, Horizon explores the history of man's understanding of the sun's structure and observations in recent years.

Horizon looks at today's precision guided weapons.

Horizon makes an investigation into claims by a group of scientists who theorize that dinosaurs were not actaully cold-blooded reptiles, but hot-blooded, like mammals.

This is an investigative report by Horizon that shows how the Equity Funding Corp. of America produced two billion dollars worth of phoney insurance.

This Horizon documentary explores animal behavior. Animals do not act for the good of their own species, rather for the preservation of their own genes.

This episode of Horizon is about infertility and the state of British scientific research in this area.

Horizon reports on Pacific Ocean fishermen who are famous for their extraordinary fishing skills. They catch fish with a kite and a tassel of spiders webs.

This is a Horizon documentary about six people who have each lost someone very close, as they describe their progress through grief.

Horizon looks at new developments in computer technology that have made mass surveillance possible, and also its political misuse.

This Horizon episode is about the actual King Arthur's Round Table, which hangs in the Hall of Winchester Castle, Hants, Britain.