1. The Shadow of Breast Cancer
Aired: Jan 7, 1991Documentary considering the nature of sudden death, the effects of coronary h...
2. Pest Wars
Aired: Jan 14, 1991This Horizon episode tells the story of the top secret experiments carried ou...
3. Molecules with Sunglasses
Aired: Jan 21, 1991Horizon investigates the case against passive smoking and reveals new evidenc...
4. In Search of the Noble Savage
Aired: Jan 28, 1991Horizon reports on the new arms verification industry emerging due to the new...
5. Malaria: Battle of the Merozoites
Aired: Feb 4, 1991Horizon follows astronomer's efforts to rescue the Hubble space telescope and...
6. The Black Sun
Aired: Feb 10, 1991Looks at the work of Earthwatch, and some of the many people who spend their ...
7. Hitler's Bomb
Aired: Feb 11, 1991This Horizon documentary presents the US auto industry's response to clean-up...
8. An Expensive Theology
Aired: Feb 25, 1991This episode of Horizon examines 20 years of research which has led to a new ...
9. The Strange Life and Death of Dr. Turing
Aired: Feb 25, 1991Looks at the phenomenon of the outbreaks of a lethal kidney disease amongst g...
10. Hot Jam in the Doughnut
Aired: Mar 4, 1991This Horizon interview presents Dr. Ulysses Seal who believes the "frozen zoo...
11. Time of Darkness (Update)
Aired: Mar 11, 1991This Horizon episode considers the pros and cons of "ecotourism" and the effe...
12. A Diet for a Lifetime
Aired: Mar 18, 1991This episode of Horizon explores the Natural History Museum and its philosoph...
13. Before Babel
Aired: Mar 25, 1991Horizon examines the problems and cartography involved in mapping mountains s...
14. The Man Who Moved the Mountains
Aired: Apr 15, 1991Horizon looks at archaeologist's new theories surrounding the population of t...
15. Iceman
Aired: Apr 22, 1991Documentary following the clean-up operation at Chernobyl and the elite team ...
16. Taking the Credit
Aired: Apr 29, 1991Horizon presents a documentary on how virtual reality can make humans feel as...
17. Fast Life in the Food Chain
Aired: May 13, 1991Zoologist Colin Tudge examines developments in farming technology and conside...
18. Dodging Doomsday
Aired: May 20, 1991Horizon explores the Camelford disaster, in which aluminium sulphate was acci...
19. A Question of Sport...
Aired: Jun 3, 1991Several astronomers and scientists explore the concepts of "hot/cold dark spa...
20. Genes R Us
Aired: Jun 10, 1991This story by Horizon looks at the expanding and controversial area of "smart...
21. A Close Encounter of the Second Kind
Aired: Jun 17, 1991In this Horizon episode, we look at the problems facing the Carl Zeiss optics...
22. Hide and Seek in Iraq
Aired: Jun 24, 1991Horizon examines the social and scientific issues around the cholesterol debate.
23. T-Rex Exposed
Aired: Jul 1, 1991Considers some of the different theories surrounding the Tyrannosaurus Rex di...
