Season 12 Episodes13
Cast1

Lynne Adams
Narrator (voice)
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Ranked #11 of 13 in Season 12•−0.2 vs season avg
Precision-machined parts are assembled into motorcycle engines, powdered glass enamel is applied and fused into decorative sculptures, plant fibres are pulped and formed into handmade paper, and layers of composite material are shaped and tested to produce flexible vaulting poles.

Lynne Adams
Narrator (voice)
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"Motorcycle Engines, Glass Enamel Sculptures, Hand-Made Paper, Vaulting Poles" is episode 13 of How It's Made season 12. It scored 7.3/10 from 20 votes, ranking #11 of 13 episodes this season (season average 7.5). It aired on April 1, 2009.