Season 20 · Episode 10

Cast Iron Tubs, Hopi Kachina Dolls, Mine Truck Engine, Memory Cards

• Release date
• January 3, 2013
• Runtime
• 21 min
• TMDB score
• 10

Molten iron is cast into heavy bathtubs before the surfaces are cleaned and coated with durable enamel. Cottonwood roots are carved and painted into traditional Hopi Kachina dolls; enormous mine-truck engines are dismantled, inspected, repaired and reassembled; and semiconductor chips are mounted, enclosed and tested to create compact memory cards.