Season 12 Episodes13
Cast1

Lynne Adams
Narrator (voice)
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Ranked #7 of 13 in Season 12•−0.1 vs season avg
Engines, cutting decks and controls are assembled into riding lawn mowers, heated kernels expand into popcorn, powered frames and articulated supports are installed in adjustable beds, and laboratory processes reproduce the conditions needed to grow cultured diamonds.

Lynne Adams
Narrator (voice)
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"Riding Mowers, Popcorn, Adjustable Beds, Cultured Diamonds" is episode 9 of How It's Made season 12. It scored 7.4/10 from 22 votes, ranking #7 of 13 episodes this season (season average 7.5). It aired on March 4, 2009.