Season 7 Episodes20
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Ranked #10 of 20 in Season 7•matches the season avg
How do they build the world's fastest lawnmowers; how do they set the price of bread; and how do they use coconuts to clean water?
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"Lawnmowers, Bread, Clean Water" is episode 18 of How Do They Do It? season 7. It scored 7.2/10 from 15 votes, ranking #10 of 20 episodes this season (season average 7.2). It aired on September 24, 2010.