The Panasonic World Solar Challenge is underway in Australia where 41 solar-powered cars – with four teams from the US -- are racing 1,870 miles across the country’s rugged Northern Territory to try to win the 20th running of the event when it ends on Thursday. And they do race – in the event’s 20 year history, the average speed of solar cars has risen from 42 MPH in 1987 to a top speed of 65 MPH in the most recent race, according to Panasonic’s race Web site.
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