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3. Lasts Longer: All there's in an electric motor is often a coil and drive-shaft, instead of the numerous moving parts in a very traditional combustion engine. As well as being ultra credible the motor will last a long time. With less moving parts to concern yourself with there is little that they will not fail. 9. Their emotional appeal Most people have either watched or been aware of the movie Wall-e. It was a a cute film, set way into the future, concerning the adventures of the little robot that has been left behind in the world to up the mess put aside by humans. The humans are living in space when they wait for the earth being re-habitable to allow them to all return. Wall-e meets another robot called EVE, who may have been shipped to earth to hunt out any indications of new life (growing plants), falls in love and follows her into space where they're involved with a lot of antics before Wall-e eventually returns to earth with EVE, the humans follow and they also set about so that it is a great location to live again.