Stock Photo - Jul. 07, 1987 - Tour de Sol 87: Covering 400 km from Biel to Arosa in six days the third Tour de Sol demonstrated 113 solar powered cars. Picture: Stefan Braegger, pilot of 'Solaris' in his unusual looking vehicle making 50-80km/h. (Credit Image: © Keystone Press Agency/Keystone USA via ZUMAPRESS.com)

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