When did Horizon Season 27 Episode 12 air?
Horizon Season 27 Episode 12 aired on April 2, 1990.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Horizon presents the real story of seismic neglect and the failure of the San Francisco city government to protect its citizens.
Direct answers for episode-level questions and details.
Horizon Season 27 Episode 12 aired on April 2, 1990.
This episode runs for approximately 60 minutes.
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