奇速英语

Powered by sun and sweat, they are showing up in cities across the country. The $5,500 bike/car hybrid is called "The ELF." The egg-shaped machine is called an "ELF," short for Electric, Light and Fun.

"Oh, I get a lot of funny looks, Sometimes I'll see people with the kids in the back and they're waving. It's a great mix of a car and a bike," said Bush.

It's actually a backwards tricycle powered by a bike pedal and a small solar powered motor that can carry passengers and cargo up to 550 pounds. It is invented by former race car technician Rob Cotter. 

The ELF requires no insurance or gasoline and is pollution free. It does 20 miles per hour with straight pedal power. Add the motor and the ELF can do 35. It's estimated that the average ELF driver could remove three tons of carbon dioxide from the atmosphere every year. 

In 18 months, Cotter has build and sold 450 ELFs and plans to triple that this year. He also wants to sell them in developing countries. "Most of the planet, they don't have cars," Cotter says "They don't have cars. Some of them hardly have roads."

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