Season 4
20076 episodes
April 11, 2007
How a spacesuit keeps an astronaut alive, the diesel engines that power the world's biggest ships, and the manufacturing processes behind the famous neon signs which cover Las Vegas
Episode 3
Nuclear Sub, Crash Test Dummies, Fruit and Vegetables
April 18, 2007
Secrets behind nuclear submarines; crash-test dummies; growing fruits and vegetables.
Episode 4
Land Mines, Air Boats, Warehouses
April 18, 2007
The world's largest land-mining machine; how airboats are built; warehouse for car parts.
Episode 5
Black Boxes, Steam Turbine, Racing Car
April 25, 2007
How black boxes survive an airplane crash; transporting giant steam turbines; making fireproof suits for race-car drivers.
Episode 6
Jet Engine, Weapons, Telescope
April 25, 2007
The design and manufacturing of large jet engines; non-lethal weapons that stun without killing; the world's largest telescope.
