When did Horizon Season 35 Episode 11 air?
Horizon Season 35 Episode 11 aired on May 14, 1998.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Horizon examines claims that measures to protect American and NATO troops against chemical and biological weapons may have backfired.
Direct answers for episode-level questions and details.
Horizon Season 35 Episode 11 aired on May 14, 1998.
This episode runs for approximately 60 minutes.
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