Wallace & Gromit's World of Invention

In this episode of the science series, Wallace and Gromit explore incredible transportation inventions from around the globe. In the 'Contraption Countdown' the focus is on peculiar transport devices, and the duo find out how to cross the River Thames in a plastic bag. They discover the intention behind laser propulsion in the creation of flying saucer technology, and meet Cedric Lynch, an illustrious engineer who invented electric tricycles.