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sboynton-16578
IMDb member since July 2022
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History Specials: 101 Inventions That Changed the World (2012)
Episode 161, Season 1
Number 52 had a wrong comment
27 July 2022
Number 52 was "differential gear" for a car but they also said that if they didn't have a differential that a locomotive would go off the tracks. Trains do not have differentials they use the sort-of cone shaped wheels so that way when it leans around a corner, it goes to a smaller part on the wheel.
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