Season 9 Episodes20
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Leather Footballs, Mussels
Sep 13, 201222 min
How do they craft footballs for the National Football League? How do they farm mussels? How do they design the ultimate fighter pilot's helmet?
Seasons17
Episode Summary
"Leather Footballs, Mussels" is episode 11 of How Do They Do It? season 9. It aired on September 13, 2012.