Horizon looks into the principles behind machines and investigates why they are so successful.

Horizon profiles the Bell Laboratories in the United States. They are one of the most important research and development centers where more than 4000 scientists work with a budget of one hundred million pounds every year. Horizon investigates the possibility of setting up a similar research station in Britain.

Horizon explores American plans to launch a space observatory to map the universe and learn how stars are created.

Horizon looks at the relationship between science and art, and also explores artists attitudes towards science.

Horizon investigates the states of big research computers in Britain. Also, Horizon looks at the H-Bomb Detectors and how British scientists have developed a nuclear explosion detector which has changed the political outlook for nuclear test controls.

The episode was shot from a biplane taking off and flying over the CERN Nuclear Physics Laboratory in Switzerland. Colin Riach interviews Dr. Lipman from the Rutherford High Energy Laboratory where an experiment is running to find out if there is a fifth force in the Universe. Colin Riach also interviews De Vos by Gordon Rattray Taylor on his theories about mental illness and geographical location.

A tribute by Professor E. N. da C. Andrade to Robert Hooke architect, astronomer, geologist, and meteorologist who discovered the cell, the unit of living tissue, in plants 300 years ago and A report by Professor R. D. Preston On thirty-six years of attempts to elucidate the baffling structure of plant cell walls Faster, Farther, Higher - A Hungarian film-maker takes a wry look at man's attempts to accelerate with a commentary by Anthony Smith

Horizon considers the safety of 'The pill'.

Nine years after the passing of the Clean Air Act, where do we stand? Scientists are gradually finding out why dirty air Is so harmful to ill persons with Dr. P. J. Lawther of Air Pollution Research Centre at St. Bartholomew's Hospital.

When a rubber tyre rolls fast on a wet surface it may rise on a film of water and begin to 'aquaplane.' Scientists are studying this fact which creates a real hazard to aircraft passengers and fast drivers. Also: Men With Gills - A new membrane developed in America holds forth the prospect of men being able to live under water.

Horizon looks at Prof. Perry Gilbert's research on captured sharks and meets with the eminent physiologist Sir Henry Dale as he celebrates his 90th birthday and looks back on his career in medical research.

Horizon looks into the study of a total eclipse, and reports on a new machine and its potential to teach deaf children to speak.

This episode of Horizon features Dr. Joseph Needham, an eminent scientist and humanist who is perhaps the greatest living authority on China.

Is all science fiction mercly fantasy-or can it give valuable clues to the future? Also: Desmond Morris interviews naturalist George Schaller about his work with gorillas studying their behavior in the wild, and work studying tigers in the wild.

The four men who opened up a new field of physics: Max Born, Paul Dirac, Werner Heisenberg and George Thompson meet and discuss topic with John Charap at the annual science conference in Lindau, Germany.

Professor Harold Edgerton of the Massachusetts Institute of Technology, who has won international recognition for his achievements in ultra-high-speed photography, talks about his work and shows some of the remarkable pictures, both still and moving, that he has taken. Also: Weighty Matters - Robin Clarke , Editor of .Science Journal, talks to Dr. Kilmister of King's College, London, about gravitational collapse and new developments in cosmology.

Horizon interviews Prof. Andrade about his collection of rare scientific books which he was about to sell.

On the 300th anniversary of Isaac Newton's greatest year of discovery, one of his most ardent disciples, Prof. Julius Summer-Miller, comes from California to illustrate the excitement of seeing Newton's principles in action.

Horizon investigates Dr. Gregory's viaduct experiment which involved looking at an object at night through the arches of a viaduct in order to test the effects of night on the accuracy of human vision.

Horizon explores heart attacks and thrombosis.

Horizon probes into the Etruscan tombs in Italy.

Horizon profiles the scientist, polymath, and Nobel prize winner Prof. Albert Szent-Gyorgi.

Horizon looks into radio telescopes.

Professor Charles Vernon Boys gives a Christmas lecture on bubbles. Also: Problems and Puzzles - T. H. O'Beirne , a mathematician, challenges you to solve some of the puzzles he has invented.