When did Horizon Season 31 Episode 20 air?
Horizon Season 31 Episode 20 aired on December 12, 1994.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Horizon presents a documentary on Synaesthesia which is an unusual disorder of perception in which barriers between the senses dissolve.
Direct answers for episode-level questions and details.
Horizon Season 31 Episode 20 aired on December 12, 1994.
This episode runs for approximately 60 minutes.
Comments coming soon
Discuss episodes with other viewers