When did NOVA Season 20 Episode 18 air?
NOVA Season 20 Episode 18 aired on December 7, 1993 at 9 PM ET.


PBS' premier science series helps viewers of all ages explore the science behind the headlines. Along the way, NOVA demystifies science and technology, and highlights the people involved in scientific pursuits.
Bill Cosby guides viewers through the most exciting footage from two decades of NOVA in a 20th anniversary salute. Real-life action, adventure, mystery, drama and non-stop discovery fill this 90-minute special.
Direct answers for episode-level questions and details.
NOVA Season 20 Episode 18 aired on December 7, 1993 at 9 PM ET.
This episode runs for approximately 55 minutes.
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