Bullet Proof Vests; Robots; Formation Skydivers
Episode: 4x01 | Airdate: Apr 4, 2007 (25 min)
Episodes
Rally Car; Letter; Titanium
Episode: 4x02 | Airdate: Apr 4, 2007 (25 min)
Forest Fires; Car Exhaust; Space Station
Episode: 4x03 | Airdate: Apr 11, 2007 (25 min)
Spacesuit; Diesel Engines; Neon Signs
Episode: 4x04 | Airdate: Apr 11, 2007 (25 min)
Nuclear Sub; Crash Test Dummies; Fruit and Vegetables
Episode: 4x05 | Airdate: Apr 18, 2007 (25 min)
Land Mines; Air Boats; Car Warehouse
Episode: 4x06 | Airdate: Apr 18, 2007 (25 min)
Black Boxes; Steam Turbine; Racing Car
Episode: 4x07 | Airdate: Apr 25, 2007 (25 min)
Jet Engine; Weapons; Telescope
Episode: 4x08 | Airdate: Apr 25, 2007 (25 min)