Next Episode of World's Greatest Inventions is
The ways in which inventions have helped to change lives.
Underground railways were initially ridiculed, but subway systems soon changed the world as giant drills cut through the earth and electric fans were used.
The world is forever changed when Karl Benz creates the first petrol-driven car and when Henry Ford revolutionises the production process a few decades later.
The history of the TV reveals how the invention came to be after a farm boy produced an electronic image and Charles Jenkins used moving silhouette images.
The introduction of the supermarket and the invention of the car make large shops big business and change what shopping itself looks like.
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