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Paul A. Eisenstein

Paul A. Eisenstein is a contributor for CNBC

Travel Tips

Hitting the Road This Summer? How to Save on Gas.

Before you finally take that much-needed vacation, make sure your car is operating at optimal efficiency.
Technology

No Cars Allowed: Big Cities Look to Curb Vehicles for Good

Urban centers around the world, from Hamburg to Shanghai, are looking to cut down on pollution by reducing the number of cars on the road.