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How It's Made

Fiberglass Insulation, Wooden Ducks, Gumball Machines, and Exhaust Systems

Season 3 Episode 23
Uncover the secrets behind Fiberglass Insulation, find out how Wooden Ducks are made, and discover how they make Exhaust Systems.
  • 22 min
  • TV-G
  • Premiered 12/29/2006