S20E10: Cast Iron Tubs, Hopi Kachina Dolls, Mine Truck Engine, Memory Cards

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.