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20 Episodes
S4 E1 - Forest Fires, Car Exhaust, Space Station
S4 E2 - Family Car, Titanium, Letter
S4 E3 - Nuclear Sub, Crash Test Dummies, Fruit and Vegetables
S4 E4 - Land Mines, Air Boats, Warehouses
S4 E5 - Black Boxes, Steam Turbine, Racing Car
S4 E6 - Jet Engine, Weapons, Telescope
S4 E7 - To be deleted
S4 E8 - To be deleted
S4 E9 - Episode 9
S4 E10 - Episode 10
S4 E11 - Episode 11
S4 E12 - Episode 12
S4 E13 - Episode 13
S4 E14 - Episode 14
S4 E15 - Episode 15
S4 E16 - Episode 16
S4 E17 - Episode 17
S4 E18 - Episode 18
S4 E19 - Episode 19
S4 E20 - Episode 20
Streaming, rent, or buy How Do They Do It? – Season 4:
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