S14 · E19

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S14 · E19

The Sunspot Mystery

Oct 7, 19771h

Horizon presents evidence that links the drought cycle with the number of magnetically-hyperactive sunspots.

‹ E18 All episodes E20 ›

Episodes

Feb 18, 1977 · 1h

S14 · E06

Hunters of the Seal

Feb 25, 1977 · 1h

S14 · E07

The Red Planet

Mar 4, 1977 · 1h

S14 · E08

One of Nature's Hotels

Mar 11, 1977 · 1h

S14 · E09

Dawn of the Solar Age

Mar 18, 1977 · 1h

S14 · E10

Genetic Roulette

Apr 1, 1977 · 1h

S14 · E11

The Amazing Doctor Newton

Jul 15, 1977 · 1h

S14 · E12

The Trouble with Medicine

Jul 22, 1977 · 1h

S14 · E13

Silent Speech

Jul 29, 1977 · 1h

S14 · E14

The Green Machine

Aug 5, 1977 · 1h

S14 · E15

The River That Came Clean

Sep 2, 1977 · 1h

S14 · E16

Blueprints in the Bloodstream

Sep 9, 1977 · 1h

S14 · E17

40 Years of Murder

Sep 16, 1977 · 1h

S14 · E18

The Cry for Help

Sep 30, 1977 · 1h

S14 · E19