Horizon — Season 1973

E01 Epidemic 04 Jan 1973 E02 Worlds in Collision 11 Jan 1973 E03 The Military Necessity 18 Jan 1973 E04 The Curtain of Silence 25 Jan 1973 E05 Crime Lab 01 Feb 1973 E06 When the Breeding Has to Stop 08 Feb 1973 E07 Science is Dead, Long Live Science 15 Feb 1973 E08 ...And Where Will the Children Play? 01 Mar 1973 E09 Acupuncture: A Chinese Puzzle 08 Mar 1973 E10 What Time is Your Body? 22 Mar 1973 E11 Survival of the Weakest 05 Apr 1973 E12 Red Sea Coral and the Crown of Thorns 12 Apr 1973 E13 Lumbered With Back-Ache! 26 Apr 1973 E14 Airport 03 May 1973 E15 Do You Remember the Memory Man? 17 May 1973 E16 What a Waste! 24 May 1973 E17 The Laws of the Land 07 Jun 1973 E18 Do We Really Need the Railways? 14 Jun 1973 E19 The Telly of Tomorrow 21 Jun 1973 E20 The Rat Man 28 Jun 1973 E21 How Does It Hurt? 05 Jul 1973 E22 A Scientist Looks at Religion 09 Aug 1973 E23 In Search of Konrad Lorenz 24 Sep 1973 E24 Stretch Up Tall 01 Oct 1973 E25 Gilding the Lily 08 Oct 1973 E26 The Black Holes of Gravity 15 Oct 1973 E27 What's so Big About Us? 22 Oct 1973 E28 The Steadfast Tin Soldier 29 Oct 1973 E29 Carry on Smoking 05 Nov 1973 E30 Air Crash Detective 26 Nov 1973 E31 An Element of Mystery 03 Dec 1973 E32 Digging Up the Future 17 Dec 1973 E33 Kula, a Reason for Giving 24 Dec 1973