Season 12 Episodes20
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Ranked #17 of 20 in Season 12•−0.3 vs season avg
Making the world's finest harp strings; Building roof windows that can keep out a hurricane; Making Belgian waffles.
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"Harp Strings, Roof Windows, Belgian Waffles" is episode 8 of How Do They Do It? season 12. It scored 6.8/10 from 11 votes, ranking #17 of 20 episodes this season (season average 7.1). It aired on July 3, 2015.