Cool rides on wheels

"The wheel was invented more than 5,000 years ago, and it has brought some awesome vehicles our way. But this invention isn't done giving . . . See how military unmanned ground vehicles tackle rough terrain and keep soldiers safe. Find out how the fastest electric race cars work. Think a car can't handle street driving one minute and tackling sand dunes the next? The high-performance Zarooq Sandracer can. See the limitless possibilities of wheeled vehicles"--Provided by publisher.