January 4, 1971 9:00 pm
In this episode, Horizon looks a the efforts of zoos to save animal species from extinction by breeding enough to ensure their survival in captivity
January 18, 1971 9:00 pm
In this episode, Horizon looks at the renowned British hospital for children, Great Ormond Street, and the Institute of Child Health.
January 25, 1971 9:00 pm
Horizon explores the island of New Guinea and its cultural changes going on there.
February 1, 1971 9:00 pm
This episode of Horizon looks at the growing arsenal of nuclear weapons over the last 25 years and the effects it has on the arms race.
February 15, 1971 9:00 pm
This episode investigates the facts about drug abuse and experimental work undertaken in this area.
February 22, 1971 9:00 pm
Kuru is a unique disease of the people of New Guinea. Horizon goes with Prof. E. J. Field to find out why.
March 8, 1971 9:00 pm
Horizon interviews ecologists that claim that man is irrevocably destroying its habitat.
March 15, 1971 9:00 pm
Horizon investigates medical student training at the St. Thomas hospital in London, England.
March 22, 1971 9:00 pm
Horizon explores the causes, and looks for way to prevent car accidents
April 5, 1971 9:00 pm
This report by Horizon looks at the long term ecological study of the forest at Wytham Wood, Oxon, in England.
April 12, 1971 9:00 pm
In 1971, Horizon reviews the life and work of Prof. Hans Eysnck, the most controversial psychologists of the time.
April 26, 1971 9:00 pm
This report by Horizon explores care for the aged, for both medical and welfare services in Britain.
May 3, 1971 9:00 pm
Horizon reports on the famous protagonist of "The Origin of Species," Thomas Henry Huxley.
May 10, 1971 9:00 pm
This episode of Horizon examines how cells organize to become complex organs, and bodies.
May 17, 1971 9:00 pm
No description available
May 24, 1971 9:00 pm
Horizon reports on food technology now experimenting with meat substitutes.
May 31, 1971 9:00 pm
No description available
June 7, 1971 9:00 pm
Horizon investigates how to treat depressive illneses.
June 14, 1971 9:00 pm
This episode of Horizon reports on the development of the aircraft bomber throughout periods of war.
June 21, 1971 9:00 pm
Horizon explores the field of palaeontology, the study of dinosaurs.
September 27, 1971 9:00 pm
This episode of Horizon looks at Britain's civil defense program, and to see if it is adequate in the event of a nuclear war.
October 4, 1971 9:00 pm
Horizon investigates rheumatism, and looks at why this disease is under-researched.
October 11, 1971 9:00 pm
Can new born babies solve complex problems? Horizon works with psychologists to see how they measure this capacity.
October 18, 1971 9:00 pm
Do city planners in Liverpool have unrealistic expectations? Horizon looks into the development and planning process of Liverpool, England.
October 25, 1971 9:00 pm
This is a two part episode of Horizon. First, Horizon looks at the life of centenary Ernest Rutherford, followed by a report of the Cavendish Labratory in Cambridge, England.
November 1, 1971 9:00 pm
Horizon explores a primitive tribe of Yanomamo Indians living in southern Venezula.
November 15, 1971 9:00 pm
This episode of Horizon looks in the ancient cave paintings found in France.
November 22, 1971 9:00 pm
This episode of Horizon reports on how the Crab Nebula was discovered, and continuing observation of the space encounter.
November 29, 1971 9:00 pm
Horizon reports on the continuing problem of the city of Venice, Italy sinking into the sea.
December 6, 1971 9:00 pm
This report by Horizon is about Prof. Hean Piaget and her child center education theory.
December 20, 1971 9:00 pm
Horizon presents the history of the submarines, from pre-World War I to today's nuclear powered submarines.
December 27, 1971 9:00 pm
This episode of Horizon investigates strange new inventions.